Pub Date : 2022-04-19DOI: 10.1080/1343943X.2022.2064309
K. Yamane, Moena Nishikawa, Y. Hirooka, Y. Narita, Tsukasa Kobayashi, Misako Kakiuchi, K. Iwai, M. Iijima
ABSTRACT Coffea arabica, an economically important crop, accounts for most of the coffee consumed globally. Increasing temperature due to climate change can cause a decrease in productivity in many crops, including coffee plants. The maximum temperature at which damage is induced has been reported for many crops, but it remains unclear in coffee plants. Here, we investigated the effect of different temperatures and the physiological damage induced by heat stress using both leaf disks and intact plants of Coffea arabica ‘Typica’. In the experiment using intact plants, we observed leaf damage by a decrease in soil plant analysis development value, and an increase in electrolyte leakage after exposure to 45°C for 96 h, whereas no leaf damage was observed for 72 h. The leaf surface temperatures after exposure to 45°C for 72 and 96 h were 44.0 and 46.3°C, respectively. Thus, a tolerance threshold in leaves of C. arabica ‘Typica’ under heat stress are likely between 44.0 and 46.3°C. The activities of catalase (CAT) and superoxide dismutase (SOD) decreased at 45°C in both leaf disks and intact plants. The decrease in the activities of SOD and CAT under heat stress may be responsible for the increased levels of reactive oxygen species, such as O2 − and H2O2, and the resulting cellular damage. Our findings provide valuable insights into the physiological responses of Coffea arabica ‘Typica’ to heat stress, which may contribute to the breeding and screening of tolerant cultivars in the future. Graphical abstract
{"title":"Temperature tolerance threshold and mechanism of oxidative damage in the leaf of Coffea arabica ‘Typica’ under heat stress","authors":"K. Yamane, Moena Nishikawa, Y. Hirooka, Y. Narita, Tsukasa Kobayashi, Misako Kakiuchi, K. Iwai, M. Iijima","doi":"10.1080/1343943X.2022.2064309","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2064309","url":null,"abstract":"ABSTRACT Coffea arabica, an economically important crop, accounts for most of the coffee consumed globally. Increasing temperature due to climate change can cause a decrease in productivity in many crops, including coffee plants. The maximum temperature at which damage is induced has been reported for many crops, but it remains unclear in coffee plants. Here, we investigated the effect of different temperatures and the physiological damage induced by heat stress using both leaf disks and intact plants of Coffea arabica ‘Typica’. In the experiment using intact plants, we observed leaf damage by a decrease in soil plant analysis development value, and an increase in electrolyte leakage after exposure to 45°C for 96 h, whereas no leaf damage was observed for 72 h. The leaf surface temperatures after exposure to 45°C for 72 and 96 h were 44.0 and 46.3°C, respectively. Thus, a tolerance threshold in leaves of C. arabica ‘Typica’ under heat stress are likely between 44.0 and 46.3°C. The activities of catalase (CAT) and superoxide dismutase (SOD) decreased at 45°C in both leaf disks and intact plants. The decrease in the activities of SOD and CAT under heat stress may be responsible for the increased levels of reactive oxygen species, such as O2 − and H2O2, and the resulting cellular damage. Our findings provide valuable insights into the physiological responses of Coffea arabica ‘Typica’ to heat stress, which may contribute to the breeding and screening of tolerant cultivars in the future. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"337 - 349"},"PeriodicalIF":2.5,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42152813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-13DOI: 10.1080/1343943X.2022.2062015
A. Ohsumi, H. Heinai, Masaki Okamura, M. Yoshimoto, T. Hosono
ABSTRACT Rice growth at an elevated air temperature (T air) during the ripening period is often evaluated using a semi-closed chamber (SCC). However, the water vapor pressure deficit (VPD) and CO2 concentration inside SCCs get lower than at ambient air plot, and these changes affect panicle temperature and photosynthesis. We developed a punched-top chamber (PTC), that is, an SCC with numerous pores on the top, and compared meteorological environments inside the two chambers and of ambient air plot. When solar radiation was >200 W m-2, ΔT air (SCC – Ambient) was 3.1°C–5.3°C, and ΔT air (PTC – Ambient) was 2.2°C–3.7°C. Excessively high T air > 38°C were more frequent inside the SCC than the PTC. The changes in VPD and CO2 concentration inside the PTC were less pronounced compared with those of the SCC, and thus PTC can be a better treatment for safely assessing the direct effect of elevated T air. Graphical abstract
摘要水稻成熟期在高温（T空气）下的生长通常使用半密闭室（SCC）进行评估。然而，短链氯化石蜡内的水蒸气压差（VPD）和CO2浓度低于环境空气区，这些变化影响了穗部温度和光合作用。我们开发了一个冲压顶室（PTC），即顶部有许多孔隙的SCC，并比较了两个室内的气象环境和环境空气图。当太阳辐射>200 W m-2时，ΔT空气（SCC–环境温度）为3.1°C–5.3°C，ΔT气体（PTC–环境温度（PTC））为2.2°C–3.7°C。SCC内部温度>38°C的过高情况比PTC更常见。与SCC相比，PTC内的VPD和CO2浓度的变化不那么明显，因此PTC可以更好地安全评估T空气升高的直接影响。图形摘要
{"title":"Punched-top chamber for moderately raising air temperature during the ripening period in rice","authors":"A. Ohsumi, H. Heinai, Masaki Okamura, M. Yoshimoto, T. Hosono","doi":"10.1080/1343943X.2022.2062015","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2062015","url":null,"abstract":"ABSTRACT Rice growth at an elevated air temperature (T air) during the ripening period is often evaluated using a semi-closed chamber (SCC). However, the water vapor pressure deficit (VPD) and CO2 concentration inside SCCs get lower than at ambient air plot, and these changes affect panicle temperature and photosynthesis. We developed a punched-top chamber (PTC), that is, an SCC with numerous pores on the top, and compared meteorological environments inside the two chambers and of ambient air plot. When solar radiation was >200 W m-2, ΔT air (SCC – Ambient) was 3.1°C–5.3°C, and ΔT air (PTC – Ambient) was 2.2°C–3.7°C. Excessively high T air > 38°C were more frequent inside the SCC than the PTC. The changes in VPD and CO2 concentration inside the PTC were less pronounced compared with those of the SCC, and thus PTC can be a better treatment for safely assessing the direct effect of elevated T air. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"280 - 288"},"PeriodicalIF":2.5,"publicationDate":"2022-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41896314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-08DOI: 10.1080/1343943X.2022.2061538
Wei Zhou, Fengjun Yan, Yong Chen, W. Ren
ABSTRACT The quantity and quality of tillers determine the yield of rice. In order to explore how optimized nitrogen fertilizer application (OFA) increases rice yield by affecting tiller growth, a pot experiment with three nitrogen treatments was performed on the basis of previous researches to investigate the growth and development of tillers. Results showed that under OFA, the emerging rate of secondary tillers and high leaf position tillers decreased, which increased with the number of primary tillers. The decrease of ineffective tillers increased the accumulation of biomass and nitrogen per tiller, which promoted the development of panicles. Compared with traditional nitrogen fertilizer application (TFA), the differentiated number of spikelets increased by 10.85%–21.70%, which led to the total number of filled spikelets increasing by 9.67%–18.95%, resulting in 9.6% increase in rice yield. Primary tillers, especially at the first, second, fifth, and sixth leaf positions, were the superior tillers in good quality, which made great contribution to rice yield and were significantly affected by nitrogen application. Making full use of the regulation effect of nitrogen on the quality of tillers will help to stabilize rice yield with less nitrogen input or increase rice yield without adding nitrogen input. Graphical abstract
{"title":"Optimized nitrogen application increases rice yield by improving the quality of tillers","authors":"Wei Zhou, Fengjun Yan, Yong Chen, W. Ren","doi":"10.1080/1343943X.2022.2061538","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2061538","url":null,"abstract":"ABSTRACT The quantity and quality of tillers determine the yield of rice. In order to explore how optimized nitrogen fertilizer application (OFA) increases rice yield by affecting tiller growth, a pot experiment with three nitrogen treatments was performed on the basis of previous researches to investigate the growth and development of tillers. Results showed that under OFA, the emerging rate of secondary tillers and high leaf position tillers decreased, which increased with the number of primary tillers. The decrease of ineffective tillers increased the accumulation of biomass and nitrogen per tiller, which promoted the development of panicles. Compared with traditional nitrogen fertilizer application (TFA), the differentiated number of spikelets increased by 10.85%–21.70%, which led to the total number of filled spikelets increasing by 9.67%–18.95%, resulting in 9.6% increase in rice yield. Primary tillers, especially at the first, second, fifth, and sixth leaf positions, were the superior tillers in good quality, which made great contribution to rice yield and were significantly affected by nitrogen application. Making full use of the regulation effect of nitrogen on the quality of tillers will help to stabilize rice yield with less nitrogen input or increase rice yield without adding nitrogen input. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"311 - 319"},"PeriodicalIF":2.5,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45397295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-30DOI: 10.1080/1343943X.2022.2054830
Y. Nakao, M. Yoshino, K. Miyamoto, S. Yabuta, Rieko Kamioka, Keisuke Hatanaka, J. Sakagami
ABSTRACT This study investigated the interactions between soil moisture conditions and seed priming on initial and late growth over 2 years (2017–2018) through field trials and container experiments with regulated soil moisture. Field trials were conducted on rainfed upland rice fields in Uganda, East Africa, where primed and control seeds were planted in triplicate and cultivated. In 2017, the percentage of first heading (head emergence) of hills was higher in priming treatments, and the time for 20% of the hills to achieve the first heading (H20) was significantly earlier than in controls. Additionally, grain ratio (number of fertile grains to sterile grains) and H20 were negatively correlated (P < 0.05). However, the difference in growth parameters between control and priming was not found in the case of 2018. The results suggested that priming reduces the growth period under certain conditions and improves drought escape. Therefore, we investigated the relationship between priming effects on initial growth under soil moisture treatments and subsequent development under waterlogged conditions. After transfer to waterlogged conditions, plants of the primed seeds initially grown in low soil moisture conditions recovered earlier than control plants. Our research concludes that the agronomical impact of hydropriming on upland rice prevents prolonged plant growth under drought by early recovery. Furthermore, it could decrease the yield loss caused by reduced rainfall in the late growth stage. Graphical abstract
{"title":"Drought escape during the late growth stage through early recovery from initial drying stress by hydropriming of upland rice","authors":"Y. Nakao, M. Yoshino, K. Miyamoto, S. Yabuta, Rieko Kamioka, Keisuke Hatanaka, J. Sakagami","doi":"10.1080/1343943X.2022.2054830","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2054830","url":null,"abstract":"ABSTRACT This study investigated the interactions between soil moisture conditions and seed priming on initial and late growth over 2 years (2017–2018) through field trials and container experiments with regulated soil moisture. Field trials were conducted on rainfed upland rice fields in Uganda, East Africa, where primed and control seeds were planted in triplicate and cultivated. In 2017, the percentage of first heading (head emergence) of hills was higher in priming treatments, and the time for 20% of the hills to achieve the first heading (H20) was significantly earlier than in controls. Additionally, grain ratio (number of fertile grains to sterile grains) and H20 were negatively correlated (P < 0.05). However, the difference in growth parameters between control and priming was not found in the case of 2018. The results suggested that priming reduces the growth period under certain conditions and improves drought escape. Therefore, we investigated the relationship between priming effects on initial growth under soil moisture treatments and subsequent development under waterlogged conditions. After transfer to waterlogged conditions, plants of the primed seeds initially grown in low soil moisture conditions recovered earlier than control plants. Our research concludes that the agronomical impact of hydropriming on upland rice prevents prolonged plant growth under drought by early recovery. Furthermore, it could decrease the yield loss caused by reduced rainfall in the late growth stage. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"269 - 279"},"PeriodicalIF":2.5,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49421019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-06DOI: 10.1080/1343943X.2022.2047077
Tin Nwe Win, Thaw Tar Oo, K. Shwe, N. Htwe, Htay Htay Oo, M. Thuzar, Yoshinori Yamamoto, H. Omori, Tadadshi Hirasawa
ABSTRACT A distinct midday to afternoon (midday) reduction of leaf photosynthetic rate (A n) occurred in rice, even under well-irrigated conditions on a clear day, but not in green gram. No significant differences between species in leaf water potential (Ψleaf) or plant resistance to water transport during daytime were found. From the pressure–volume curves, it was revealed that rice leaves had a larger bulk modulus of elasticity (ε), and their turgor pressure (TP) decreased more as Ψleaf declined than of green gram leaves. The TP of rice leaves was estimated to be lower in the midday than that of green gram. We attribute the distinct midday reduction of A n in rice to the larger ε of rice than that of green gram. Graphical abstract
{"title":"Large leaf modulus of elasticity is associated with the distinct midday reduction of photosynthesis in rice (Oryza sativa L.): a comparison with green gram (Vigna radiata (L.) R.Wilczek)","authors":"Tin Nwe Win, Thaw Tar Oo, K. Shwe, N. Htwe, Htay Htay Oo, M. Thuzar, Yoshinori Yamamoto, H. Omori, Tadadshi Hirasawa","doi":"10.1080/1343943X.2022.2047077","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2047077","url":null,"abstract":"ABSTRACT A distinct midday to afternoon (midday) reduction of leaf photosynthetic rate (A n) occurred in rice, even under well-irrigated conditions on a clear day, but not in green gram. No significant differences between species in leaf water potential (Ψleaf) or plant resistance to water transport during daytime were found. From the pressure–volume curves, it was revealed that rice leaves had a larger bulk modulus of elasticity (ε), and their turgor pressure (TP) decreased more as Ψleaf declined than of green gram leaves. The TP of rice leaves was estimated to be lower in the midday than that of green gram. We attribute the distinct midday reduction of A n in rice to the larger ε of rice than that of green gram. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"224 - 231"},"PeriodicalIF":2.5,"publicationDate":"2022-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41874033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-03DOI: 10.1080/1343943X.2022.2033127
K. Sugiura, T. Oi, Toshiharu Tanaka, Aoi Hamagashira, Rachana Ouk, Mitsuru Nakamura, Yasuto Ide, Kengo Tsuda, A. Ito, A. Yamauchi
ABSTRACT Pecky rice incidence caused by rice stink bugs greatly decreases the quality of rice grain and has come a big problem not only in Japan but also many other rice producing countries recently. In this study, antixenosis and tolerance were examined as the factors of resistance to rice stink bugs attack of rice line CRR-99-95 W. Two experiments were conducted to determine a possibility of antixenosis involvement as a factor of the resistance in CRR-99-95 W. The results showed no correlation between the number of Leptocorisa chinensis parasites and pecky rice incidence. Furthermore, no significant difference was found between the sucking frequency of Nezara viridula on mature husks of CRR-99-95 W and that on the check genotypes. These results suggest that CRR-99-95 W does not exhibit antixenosis effect against rice stink bugs. Then, to examine the tolerance factor involved in the resistance mechanism, the husks structures were analyzed. The results showed that the packing ratio of cell wall of the sclerenchyma fibers in the palea tended to be higher in CRR-99-95-W compared to the check genotype. In addition, the width of the hook openness of the palea of CRR-99-95 W was narrower than that of the check genotype. Such morphological characteristic of CRR-99-95 W may play an important role in its resistance against stink bug attack. Graphical abstract
{"title":"Resistance factors of pecky rice incidence caused by the rice stink bugs (Leptocorisa chinensis, Nezara viridula) in rice line CRR-99-95W","authors":"K. Sugiura, T. Oi, Toshiharu Tanaka, Aoi Hamagashira, Rachana Ouk, Mitsuru Nakamura, Yasuto Ide, Kengo Tsuda, A. Ito, A. Yamauchi","doi":"10.1080/1343943X.2022.2033127","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2033127","url":null,"abstract":"ABSTRACT Pecky rice incidence caused by rice stink bugs greatly decreases the quality of rice grain and has come a big problem not only in Japan but also many other rice producing countries recently. In this study, antixenosis and tolerance were examined as the factors of resistance to rice stink bugs attack of rice line CRR-99-95 W. Two experiments were conducted to determine a possibility of antixenosis involvement as a factor of the resistance in CRR-99-95 W. The results showed no correlation between the number of Leptocorisa chinensis parasites and pecky rice incidence. Furthermore, no significant difference was found between the sucking frequency of Nezara viridula on mature husks of CRR-99-95 W and that on the check genotypes. These results suggest that CRR-99-95 W does not exhibit antixenosis effect against rice stink bugs. Then, to examine the tolerance factor involved in the resistance mechanism, the husks structures were analyzed. The results showed that the packing ratio of cell wall of the sclerenchyma fibers in the palea tended to be higher in CRR-99-95-W compared to the check genotype. In addition, the width of the hook openness of the palea of CRR-99-95 W was narrower than that of the check genotype. Such morphological characteristic of CRR-99-95 W may play an important role in its resistance against stink bug attack. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"172 - 182"},"PeriodicalIF":2.5,"publicationDate":"2022-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47158229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-01DOI: 10.1080/1343943X.2021.2019593
Shiori Yabe, H. Yoshida, Erina Fushimi, M. Yamasaki, H. Maeda, T. Hayashi, H. Nakagawa
ABSTRACT The major impact of both genotypic and environmental factors on grain-filling efficiency of rice (Oryza sativa L.) makes evaluating cultivar’s grain-filling characteristics highly complicated. To assess grain-filling characteristics, the allocation index (Alli) was defined as a novel indicator representing the pattern of resource allocation in panicles. Alli was calculated as the ratio of source of yield utilized for producing well-filled grains to the total source consumed in a panicle, using estimated grain weight distribution data. We measured the Alli of 91 Japanese rice cultivars grown under nine environments involving multiple years, cropping seasons, three sites, and flag leaf clipping. Each cultivar’s stability in Alli was evaluated using the data of various sink–source balance conditions. As a result of integrated analysis of multiple cultivars, we observed a trade-off relationship between the stability of Alli and the stability of mean weight of well-filled grains (mu2). The popular high-yielding cultivars Hokuriku 193 and Takanari showed high stability of Alli and mu2 under various sink–source balance conditions. Among the 91 cultivars, Hokuriku 193 showed stable characteristics with a high sink-filling ratio. Our results demonstrate that the grain weight distribution and Alli could be used as novel indicator of grain-filling characteristics, and that the trade-off relationship between the stability of Alli and mu2 should be considered when we select cultivars for multi-environmental cultivation.
{"title":"A novel index to evaluate resource allocation pattern in panicles in Japanese rice cultivars","authors":"Shiori Yabe, H. Yoshida, Erina Fushimi, M. Yamasaki, H. Maeda, T. Hayashi, H. Nakagawa","doi":"10.1080/1343943X.2021.2019593","DOIUrl":"https://doi.org/10.1080/1343943X.2021.2019593","url":null,"abstract":"ABSTRACT The major impact of both genotypic and environmental factors on grain-filling efficiency of rice (Oryza sativa L.) makes evaluating cultivar’s grain-filling characteristics highly complicated. To assess grain-filling characteristics, the allocation index (Alli) was defined as a novel indicator representing the pattern of resource allocation in panicles. Alli was calculated as the ratio of source of yield utilized for producing well-filled grains to the total source consumed in a panicle, using estimated grain weight distribution data. We measured the Alli of 91 Japanese rice cultivars grown under nine environments involving multiple years, cropping seasons, three sites, and flag leaf clipping. Each cultivar’s stability in Alli was evaluated using the data of various sink–source balance conditions. As a result of integrated analysis of multiple cultivars, we observed a trade-off relationship between the stability of Alli and the stability of mean weight of well-filled grains (mu2). The popular high-yielding cultivars Hokuriku 193 and Takanari showed high stability of Alli and mu2 under various sink–source balance conditions. Among the 91 cultivars, Hokuriku 193 showed stable characteristics with a high sink-filling ratio. Our results demonstrate that the grain weight distribution and Alli could be used as novel indicator of grain-filling characteristics, and that the trade-off relationship between the stability of Alli and mu2 should be considered when we select cultivars for multi-environmental cultivation.","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"195 - 210"},"PeriodicalIF":2.5,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43179175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-30DOI: 10.1080/1343943X.2021.2022500
A. Kobayashi, Yoshie Machida, Syuto Watanabe, Yusaku Morozumi, Fumihiro Nakaoka, Takeshi Hayashi, K. Tomita
ABSTRACT Because of global warming, the ripening period of rice (Oryza sativa L.) is becoming hotter in Japan, and there is concern that eating quality will decline as a result. Amylopectin is the largest component of rice endosperm starch and its short-chain content has a considerable effect on the eating quality of cooked rice. Here we investigated the effect of high temperature during ripening on amylopectin chain-length distribution in ‘Koshihikari’, the leading cultivar in Japan, and in ‘Ichihomare’, released in 2017 and grown in Fukui prefecture, ripened in paddies over multiple years. The amylopectin short-chain content of degree-of-polymerization (DP) 6–13 of ‘Koshihikari’ grain ripened at high temperature was 3.03 points lower than that of grain ripened at low temperature. In contrast, that of ‘Ichihomare’ was only 0.26 points lower. For every 1°C increase in temperature during ripening, the short-chain content of DP 6–13 of ‘Koshihikari’ decreased linearly by 1.03 points whereas that of ‘Ichihomare’ did not decrease significantly. These results suggest that the amylopectin chain-length distribution of ‘Ichihomare’ might be more stable to temperature during ripening than that of ‘Koshihikari’. The reason is yet unknown, but this trait will contribute to breeding and production of cultivars with stable good eating quality under high temperatures during ripening. Graphical abstract
{"title":"Effects of temperature during ripening on amylopectin chain-length distribution of ‘Koshihikari’ and ‘Ichihomare’","authors":"A. Kobayashi, Yoshie Machida, Syuto Watanabe, Yusaku Morozumi, Fumihiro Nakaoka, Takeshi Hayashi, K. Tomita","doi":"10.1080/1343943X.2021.2022500","DOIUrl":"https://doi.org/10.1080/1343943X.2021.2022500","url":null,"abstract":"ABSTRACT Because of global warming, the ripening period of rice (Oryza sativa L.) is becoming hotter in Japan, and there is concern that eating quality will decline as a result. Amylopectin is the largest component of rice endosperm starch and its short-chain content has a considerable effect on the eating quality of cooked rice. Here we investigated the effect of high temperature during ripening on amylopectin chain-length distribution in ‘Koshihikari’, the leading cultivar in Japan, and in ‘Ichihomare’, released in 2017 and grown in Fukui prefecture, ripened in paddies over multiple years. The amylopectin short-chain content of degree-of-polymerization (DP) 6–13 of ‘Koshihikari’ grain ripened at high temperature was 3.03 points lower than that of grain ripened at low temperature. In contrast, that of ‘Ichihomare’ was only 0.26 points lower. For every 1°C increase in temperature during ripening, the short-chain content of DP 6–13 of ‘Koshihikari’ decreased linearly by 1.03 points whereas that of ‘Ichihomare’ did not decrease significantly. These results suggest that the amylopectin chain-length distribution of ‘Ichihomare’ might be more stable to temperature during ripening than that of ‘Koshihikari’. The reason is yet unknown, but this trait will contribute to breeding and production of cultivars with stable good eating quality under high temperatures during ripening. Graphical abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"22 1","pages":"250 - 259"},"PeriodicalIF":2.5,"publicationDate":"2022-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59803325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-29DOI: 10.1080/1343943X.2022.2030239
Thi Nhu Mai Nguyen, T. Abiko, Tetsuhiro Nakamura, T. Mochizuki
ABSTRACT Rice bran oil, a valuable ingredient of rice bran (composed mainly of embryo and aleurone), is gaining increasing attention for its abundance and benefits for human health. To increase production, breeders have selected for enlarged embryos and thickened aleurone layers. However, breeding for the latter is impeded by the time-consuming and labor-intensive process of observation of aleurone traits. Here, we established a new method for visualizing aleurone layers comprising embedding of mature grains in a plate, dichromatic staining of half grains, and computer-assisted image analysis. With this ‘plate method’, a batch of up to 100 grains fixed on the plate can be handled and examined more efficiently than the standard cryomicrotome method, which only processes the grains individually. In addition, the results obtained from the plate method were highly correlated with that of the cryomicrotome method in terms of aleurone area (r = 0.92) and mean aleurone thickness (r = 0.93). This new method allowed us to rapidly assess the aleurone phenotypes of more than 22,000 mutagenized grains of ‘Mizuhochikara’, with 700–1000 grains per day. As a result, one mutant line with thickened aleurone layer was successfully isolated. Graphical abstractA plate method for visualizing aleurone layers in mature rice grains
{"title":"Development and Application of a Plate Method for Visualizing Aleurone Layers in Mature Rice Grains","authors":"Thi Nhu Mai Nguyen, T. Abiko, Tetsuhiro Nakamura, T. Mochizuki","doi":"10.1080/1343943X.2022.2030239","DOIUrl":"https://doi.org/10.1080/1343943X.2022.2030239","url":null,"abstract":"ABSTRACT Rice bran oil, a valuable ingredient of rice bran (composed mainly of embryo and aleurone), is gaining increasing attention for its abundance and benefits for human health. To increase production, breeders have selected for enlarged embryos and thickened aleurone layers. However, breeding for the latter is impeded by the time-consuming and labor-intensive process of observation of aleurone traits. Here, we established a new method for visualizing aleurone layers comprising embedding of mature grains in a plate, dichromatic staining of half grains, and computer-assisted image analysis. With this ‘plate method’, a batch of up to 100 grains fixed on the plate can be handled and examined more efficiently than the standard cryomicrotome method, which only processes the grains individually. In addition, the results obtained from the plate method were highly correlated with that of the cryomicrotome method in terms of aleurone area (r = 0.92) and mean aleurone thickness (r = 0.93). This new method allowed us to rapidly assess the aleurone phenotypes of more than 22,000 mutagenized grains of ‘Mizuhochikara’, with 700–1000 grains per day. As a result, one mutant line with thickened aleurone layer was successfully isolated. Graphical abstractA plate method for visualizing aleurone layers in mature rice grains","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"260 - 267"},"PeriodicalIF":2.5,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41490734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-27DOI: 10.1080/1343943X.2021.2021092
A. Matsuura, Y. Kato, Tatsurou Suzuki, K. Murata, P. An
ABSTRACT The purpose was to elucidate the hypoxia tolerance mechanism of millet species by focusing on the oxygen acquisition mechanism of adventitious roots. Brachiaria ramosa, Echinochloa utilis, Eragrostis tef, and Setaria italica were used. Thirty-day old plants were hydroponically cultivated for 28 days as the control, where aeration was continued and a hypoxia treatment was applied, where nitrogen gas was flushed to reduce the oxygen concentration. From the stress susceptibility index based on plant growth rate, it was clarified that E. utilis and E. tef had higher hypoxia tolerance than B. ramosa and S. italica. Root growth rate, nitrogen concentration of leaves and stems, and sodium concentration per plant of the higher hypoxia-tolerant species did not change with hypoxia treatment. In hypoxia-susceptible millet species, the root growth rate and nitrogen concentration in the leaf and stem decreased, and the sodium concentration in the whole plant increased. The proportion of the stele area of the adventitious root of the hypoxia-tolerant millet species was smaller than that of the hypoxia-susceptible millet species, and the lysigenous aerenchyma was constitutively developed. Furthermore, root hairs were observed near the root tip in the hypoxia-tolerant millet species. In conclusion, we deduced that the hypoxia tolerance of the millet species is mainly attributable to the supply of oxygen to the root tip via the lysigenous aerenchyma along the adventitious root. Lower oxygen consumption by a smaller proportion of the stele area might be an important genetic trait. Furthermore, root hair may contribute to nutrient absorption. Graphical Abstract
{"title":"Hypoxia tolerance of four millet species is attributable to constitutive aerenchyma formation and root hair development of adventitious roots","authors":"A. Matsuura, Y. Kato, Tatsurou Suzuki, K. Murata, P. An","doi":"10.1080/1343943X.2021.2021092","DOIUrl":"https://doi.org/10.1080/1343943X.2021.2021092","url":null,"abstract":"ABSTRACT The purpose was to elucidate the hypoxia tolerance mechanism of millet species by focusing on the oxygen acquisition mechanism of adventitious roots. Brachiaria ramosa, Echinochloa utilis, Eragrostis tef, and Setaria italica were used. Thirty-day old plants were hydroponically cultivated for 28 days as the control, where aeration was continued and a hypoxia treatment was applied, where nitrogen gas was flushed to reduce the oxygen concentration. From the stress susceptibility index based on plant growth rate, it was clarified that E. utilis and E. tef had higher hypoxia tolerance than B. ramosa and S. italica. Root growth rate, nitrogen concentration of leaves and stems, and sodium concentration per plant of the higher hypoxia-tolerant species did not change with hypoxia treatment. In hypoxia-susceptible millet species, the root growth rate and nitrogen concentration in the leaf and stem decreased, and the sodium concentration in the whole plant increased. The proportion of the stele area of the adventitious root of the hypoxia-tolerant millet species was smaller than that of the hypoxia-susceptible millet species, and the lysigenous aerenchyma was constitutively developed. Furthermore, root hairs were observed near the root tip in the hypoxia-tolerant millet species. In conclusion, we deduced that the hypoxia tolerance of the millet species is mainly attributable to the supply of oxygen to the root tip via the lysigenous aerenchyma along the adventitious root. Lower oxygen consumption by a smaller proportion of the stele area might be an important genetic trait. Furthermore, root hair may contribute to nutrient absorption. Graphical Abstract","PeriodicalId":20259,"journal":{"name":"Plant Production Science","volume":"25 1","pages":"157 - 171"},"PeriodicalIF":2.5,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48795451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：