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The photosynthetic function analysis for leaf photooxidation in rice. 水稻叶片光氧化的光合功能分析。
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2023-02-20 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2023.004
H Xu, X Chu, K J Gou, D X Jiang, Q Q Li, C G Lv, Z P Gao, G X Chen

Photooxidative damage causes early leaf senescence and plant cell death. In this study, a light-sensitive rice cultivar, 812HS, and a non-light-sensitive cultivar, 812S, were used to investigate early leaf photooxidation. Leaf tips of 812HS exhibited yellowing under a light intensity of 720 μmol(photon) m-2 s-1, accompanied by a decrease in chlorophyll and carotenoids, but 812S was unaffected. The photosynthetic performance of 812HS was also poorer than that of 812S. The H2O2, O2 ·-, and malondialdehyde content increased sharply in 812HS, and associated antioxidant enzymes were inhibited. The degradation of core proteins in both PSI and PSII, as well as other photosynthesis-related proteins, was accelerated in 812HS. When shaded [180 μmol(photon) m-2 s-1], 812HS recovered to normal. Therefore, our findings suggested excess light disturbed the balance of ROS metabolism, leading to the destruction of the antioxidant system and photosynthetic organs, and thus triggering the senescence of rice leaves.

光氧化损伤导致叶片早期衰老和植物细胞死亡。以光敏型水稻812HS和非光敏型水稻812S为材料,研究了叶片早期光氧化现象。在720 μmol(光子)m-2 s-1的光强下,812HS叶尖呈现黄化,叶绿素和类胡萝卜素含量下降,但812S未受影响。812HS的光合性能也不如812S。H2O2、O2·-和丙二醛含量急剧升高,相关的抗氧化酶受到抑制。812HS加速了PSI和PSII核心蛋白以及其他光合作用相关蛋白的降解。当遮光[180 μmol(光子)m-2 s-1]时,812HS恢复正常。因此,我们的研究结果表明,过量的光干扰了ROS代谢的平衡,导致抗氧化系统和光合器官的破坏,从而引发水稻叶片衰老。
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引用次数: 0
On the evolution of the concept of two light reactions and two photosystems for oxygenic photosynthesis: A personal perspective. 氧光合作用中两个光反应和两个光系统概念的演变:个人观点。
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2023-02-16 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2023.006
G Govindjee

I present here a personal perspective of the evolution of the two-light reaction two-pigment scheme for the electron transport in oxygenic photosynthesis - as I have lived through it - first as a graduate student of Robert Emerson, from September 1956-January 1959, and then of Eugene Rabinowitch from February 1959-September 1960. I have provided here some of the key published work in my way and have also provided a few photographs. It is essential to remind ourselves upfront that different individuals may have different recollections of the same event (see e.g., the Japanese movie 'Rashomon' https://en.wikipedia.org/wiki/Rashomon). Thus, I encourage others to write about their perspective. Further, I recognize, upfront, the support and encouragement I have received from Robert Blankenship for writing this perspective, and from Győző Garab for submission of this story to Photosynthetica. I begin my perspective with a dedication to Robert Emerson, whose pioneering work led to the concept of the two-light reaction two-pigment system in oxygenic photosynthesis.

在此,我从个人的角度阐述了氧光合作用中电子传递的双光反应双色素方案的演变——我亲身经历过这一过程——首先是作为罗伯特·爱默生的研究生(1956年9月至1959年1月),然后是尤金·拉宾诺维奇(1959年2月至1960年9月)。我在这里提供了一些以我的方式发表的重要作品,也提供了一些照片。有必要事先提醒自己,不同的人可能对同一件事有不同的回忆(例如,日本电影《罗生门》https://en.wikipedia.org/wiki/Rashomon)。因此,我鼓励其他人写下他们的观点。此外,我首先感谢罗伯特·布兰肯希普(Robert Blankenship)对我写这个观点的支持和鼓励,以及Győző Garab对我将这个故事提交给Photosynthetica的支持和鼓励。我首先要向罗伯特·爱默生致敬,他的开创性工作导致了氧气光合作用中双光反应双色素系统的概念。
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引用次数: 0
Improving salt tolerance of bean (Phaseolus vulgaris L.) with hydrogen sulfide. 硫化氢提高菜豆耐盐性。
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2023-02-10 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2023.005
M Ekinci, M Turan, S Ors, A Dursun, E Yildirim

The current study examined the H2S applications on growth, biochemical and physiological parameters of bean seedlings under saline conditions. The findings of the study indicated that salt stress decreased plant growth and development, photosynthetic activity, and mineral and hormone content [excluding abscisic acid (ABA)] in bean seedlings. Plant and root fresh mass and dry mass with H2S applications increased as compared to the control treatment at the same salinity level. Both salinity and H2S treatments significantly affected the net assimilation rate, stomatal conductance, transpiration rate, and intercellular CO2 content of bean seedlings. Significant increases occurred in H2O2, malondialdehyde (MDA), proline, sucrose content, enzyme activity, and ABA content with salt stress. However, H2S applications inhibited the effects of salinity on plant growth, photosynthetic activity, and mineral content in beans. H2S applications reduced H2O2, MDA, proline, sucrose content, enzyme activity, and ABA content in beans. As a result, exogenous H2S applications could mitigate the negative impacts of salinity in beans.

本研究考察了H2S在盐渍条件下对大豆幼苗生长及生化生理参数的影响。研究结果表明,盐胁迫降低了大豆幼苗的生长发育、光合活性以及矿物质和激素含量(不含脱落酸)。在相同的盐度水平下,施用H2S的植株和根系的新鲜质量和干质量都比对照处理增加。盐度和H2S处理均显著影响大豆幼苗的净同化速率、气孔导度、蒸腾速率和细胞间CO2含量。在盐胁迫下,H2O2、丙二醛(MDA)、脯氨酸、蔗糖含量、酶活性和ABA含量显著升高。然而,施用H2S抑制了盐度对植物生长、光合活性和豆类矿物质含量的影响。H2S处理降低了大豆中H2O2、丙二醛、脯氨酸、蔗糖含量、酶活性和ABA含量。因此,外源H2S的施用可以减轻盐度对大豆的负面影响。
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引用次数: 0
Photosynthetic performance of walnut leaves during the occurrence of leaf scorch. 核桃叶片焦化时叶片光合性能的变化。
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2023-01-30 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2023.003
S W Wang, C J Xing, C F Zhang, T Guo, H L Hao, Z Y Zhang, S Wang, J M Shu

To clarify the effect of leaf scorch on walnut leaf photosynthesis, photosynthetic parameters were measured in Juglans regia 'Wen185' and 'Xinxin2' symptom trees (WS, XS) and symptomless trees (WH, XH). At the early stage of infection and under the low-grade leaf scorch, WS showed significantly lower net photosynthetic rate (P N), stomatal limitation (Ls), and higher intercellular CO2 concentration (C i) than those of WH. However, at the mid to late stage of infection and under the high-grade leaf scorch, WS showed significantly lower P N, C i, the maximal quantum yield of PSII photochemistry and higher Ls, minimal fluorescence yield of the dark-adapted state, nonphotochemical quenching than those of WH, which would occur once Juglans regia 'Xinxin2' was infected. The above results indicated the effect of leaf scorch on walnut leaf photosynthesis was related to the walnut varieties and the duration and severity of the disease. Under the influence of leaf scorch, the decline in photosynthesis of Juglans regia 'Wen185' leaves changed from stomatal to nonstomatal restriction, while Juglans regia 'Xinxin2' leaves showed always nonstomatal restriction.

为明确叶片焦化对核桃叶片光合作用的影响,测定了核桃‘温185’和‘新新2’症状树(WS、XS)和无症状树(WH、XH)的光合参数。在侵染早期和叶片低程度灼烧下,WS的净光合速率(pn)、气孔限制(Ls)和胞间CO2浓度(ci)均显著低于WH。而在侵染中后期和叶片重度灼烧条件下,WS的P N、C i、PSII光化学量子产率显著低于WH, l值显著高于WH,暗适应态荧光产率最低,非光化学猝灭。上述结果表明,叶片烧焦对核桃叶片光合作用的影响与核桃品种、病害持续时间和严重程度有关。在叶片焦化的影响下,核桃‘温185’叶片的光合作用下降由气孔限制转变为非气孔限制,而核桃‘新新2’叶片的光合作用下降始终表现为非气孔限制。
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引用次数: 0
Diurnal changes in the stomatal, mesophyll, and biochemical limitations of photosynthesis in well-watered greenhouse-grown strawberries. 水分充足的温室草莓气孔、叶肉和光合作用生化限制的日变化。
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2023-01-25 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2023.001
G Yokoyama, S Ono, D Yasutake, K Hidaka, T Hirota

The diurnal variations in the factors of photosynthesis reduction under well-watered greenhouse conditions remain poorly understood. We conducted diurnal measurements of gas exchange and chlorophyll fluorescence in strawberries (Fragaria × ananassa Duch.) for three sunny days. Quantitative limitation analysis was also conducted to investigate the diurnal variations of photosynthetic limitations [stomatal (S L), mesophyll (MC L), and biochemical limitation (B L)]. Under well-watered greenhouse conditions, a photosynthesis reduction was observed, and the respective limitations exhibited different diurnal changes based on the environmental stress severity. The main limitation was S L, varying between 11.3 and 27.1% around midday, whereas MC L and B L were in 4.3-14.2% and 1.7-8.5%, respectively, under relatively moderate conditions. However, both S L (11.2-34.2%) and MC L (4.8-26.4%) predominantly limited photosynthesis under relatively severe conditions, suggesting that stomatal closure was the main limitation and that the decline in mesophyll conductance was not negligible under strong environmental stress, even under well-watered greenhouse conditions.

在水分充足的温室条件下,光合作用减少因子的日变化仍然知之甚少。对草莓(Fragaria × ananassa Duch.)进行了连续3天的气体交换和叶绿素荧光测定。对光合限制[气孔限制(S L)、叶肉限制(MC L)和生化限制(B L)]的日变化规律进行了定量限限分析。在水分充足的温室条件下,光合作用减少,且各自的限制在不同的环境胁迫程度下表现出不同的日变化。中午前后主要限制为硫硫,变化范围在11.3 ~ 27.1%之间,中度条件下MC和bl分别在4.3 ~ 14.2%和1.7 ~ 8.5%之间。然而,在相对严峻的环境胁迫条件下,S L(11.2-34.2%)和MC L(4.8-26.4%)对光合作用的限制明显,表明气孔关闭是主要的限制因素,在强环境胁迫下,即使在水分充足的温室条件下,叶肉导度的下降也不容忽视。
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引用次数: 0
Intraspecific variation in photosynthetic efficiency in soybean (Glycine max L.) varieties towards solar ultraviolet radiations. 大豆(Glycine max L.)品种光合效率对太阳紫外线辐射的种内变异
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2022-12-21 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2022.048
S S Baroniya, K Jumrani, M Baroniya, K N Guruprasad, M Landi, S Kataria

In the current study, we used four soybean varieties PK-1029, PK-472, NRC-7, and Hardee to examine the effect of exclusion of solar UV radiation on photosynthetic efficiency and to test possible variety-dependent sensitivity to ambient UV (280-400 nm). Plants that were grown under UV exclusion filters had higher chlorophyll a and b, efficiencies of PSII and more active reaction centers indicated that PSII were substantially affected by solar UV radiation. The significant increase in net photosynthesis was linked to increased stomatal conductance and lower intercellular concentration of CO2 in UV-excluded plants. The exclusion of solar UV increased seed mass per plant in all soybean varieties as compared to the control; this indicates that ambient UV exclusions boost photosynthetic efficiency and improve soybean yield. The overall cumulative stress response index of four varieties implies that Hardee and PK-472 were more sensitive whereas NRC-7 and PK-1029 were resistant to ambient UV radiations.

在本研究中,我们以四个大豆品种PK-1029、PK-472、NRC-7和Hardee为研究对象,研究了排除太阳紫外线辐射对光合效率的影响,并测试了品种对环境紫外线(280-400 nm)的敏感性。在紫外线过滤下生长的植物叶绿素a和b较高,PSII的效率较高,反应中心更活跃,表明PSII受太阳紫外线辐射的影响较大。在不受紫外线照射的植物中,净光合作用的显著增加与气孔导度增加和细胞间CO2浓度降低有关。与对照相比,排除太阳紫外线使所有大豆品种单株种子质量增加;这表明排除环境紫外线可提高大豆的光合效率和产量。4个品种的综合累积胁迫响应指数表明,Hardee和PK-472对环境紫外线的敏感性较高,而NRC-7和PK-1029对环境紫外线的抗性较强。
{"title":"Intraspecific variation in photosynthetic efficiency in soybean (<i>Glycine max</i> L.) varieties towards solar ultraviolet radiations.","authors":"S S Baroniya, K Jumrani, M Baroniya, K N Guruprasad, M Landi, S Kataria","doi":"10.32615/ps.2022.048","DOIUrl":"10.32615/ps.2022.048","url":null,"abstract":"<p><p>In the current study, we used four soybean varieties PK-1029, PK-472, NRC-7, and Hardee to examine the effect of exclusion of solar UV radiation on photosynthetic efficiency and to test possible variety-dependent sensitivity to ambient UV (280-400 nm). Plants that were grown under UV exclusion filters had higher chlorophyll <i>a</i> and <i>b</i>, efficiencies of PSII and more active reaction centers indicated that PSII were substantially affected by solar UV radiation. The significant increase in net photosynthesis was linked to increased stomatal conductance and lower intercellular concentration of CO<sub>2</sub> in UV-excluded plants. The exclusion of solar UV increased seed mass per plant in all soybean varieties as compared to the control; this indicates that ambient UV exclusions boost photosynthetic efficiency and improve soybean yield. The overall cumulative stress response index of four varieties implies that Hardee and PK-472 were more sensitive whereas NRC-7 and PK-1029 were resistant to ambient UV radiations.</p>","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"50 1","pages":"203-214"},"PeriodicalIF":2.1,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11515822/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77438951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Happy birthday, Govindjee! 生日快乐,戈文杰!
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2022-12-21 eCollection Date: 2022-01-01 DOI: 10.32615/ps.2022.052
O Prášil
{"title":"Happy birthday, Govindjee!","authors":"O Prášil","doi":"10.32615/ps.2022.052","DOIUrl":"10.32615/ps.2022.052","url":null,"abstract":"","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"26 1","pages":"562-563"},"PeriodicalIF":2.1,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11558574/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73255023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adaptive photosynthetic strategies of the invasive plant Sphagneticola trilobata and its hybrid to a low-light environment. 入侵植物三叶藻及其杂交种对弱光环境的适应性光合策略
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2022-12-20 eCollection Date: 2022-01-01 DOI: 10.32615/ps.2022.051
W Q Ke, Y R Pan, L H Chen, J D Huang, J J Zhang, X Y Long, M L Cai, C L Peng

In stressful environments, invasive plants acclimate more efficiently than native plants and hybridization mainly contributes to this process. We examined changes in the morphological characteristics, photosynthetic characteristics, and antioxidant capacity of Sphagneticola trilobata and its hybrids in a low-light environment to explore their invasiveness, with Sphagneticola calendulacea serving as the control. The morphological plasticity of S. trilobata was not dominant, the maximal photochemical efficiency of PSII, actual quantum yield of PSII, and electron transport rate of PSII increased and nonphotochemical quenching decreased, while S. calendulacea and the hybrid produced opposite results. S. trilobata showed fewer spots stained for reactive oxygen species in tissues, with an increase in superoxide dismutase activity. Although S. trilobata is a heliophilous plant, we found that the shade tolerance of S. trilobata and the hybrid were stronger than that of S. calendulacea, which may be one important mechanism of invasion.

在逆境环境中,入侵植物比本地植物更有效地适应环境,而杂交是这一过程的主要原因。本研究以金盏花Sphagneticola calendulacea为对照,研究了在弱光环境下三叶球藻及其杂交种形态特征、光合特性和抗氧化能力的变化,探讨了它们的入侵性。三叶草的形态可塑性不占优势,PSII的最大光化学效率、PSII的实际量子产率和PSII的电子传递速率增加,非光化学猝灭降低,而金盏花和杂交种的结果相反。三叶虫组织中活性氧染色斑点较少,超氧化物歧化酶活性增加。虽然三叶草是喜日光植物,但我们发现三叶草及其杂交品种的耐阴性强于金盏菊,这可能是其入侵的重要机制之一。
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引用次数: 0
Photosynthetic responses of Eulophia dentata, Bletilla formosana, and Saccharum spontaneum under various photosynthetic photon flux density conditions. 齿藻、台湾白芨和自发糖在不同光合光子通量密度条件下的光合响应
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2022-12-16 eCollection Date: 2022-01-01 DOI: 10.32615/ps.2022.050
Y-H Lai, K-H Lin, C-P Liu, T-S Liao, M-Y Huang, C-W Wang, C-I Chen

This study aimed to determine the photosynthetic performance and differences in chlorophyll fluorescence (ChlF) parameters between Eulophia dentata and its companion species Bletilla formosana and Saccharum spontaneum when subjected to different photosynthetic photon flux density (PPFDs). Leaf surfaces were then illuminated with 50, 100 (low PPFDs), 300, 500, 800 (moderate PPFDs); 1,000; 1,500; and 2,000 (high PPFDs) μmol m-2·s-1, and the ChlF parameters were measured during the whole process. Increasing nonphotochemical quenching of ChlF and decreasing potential quantum efficiency of PSII, actual quantum efficiency of PSII, and quantum efficiency ratio of PSII in dark recovery from 0-60 min were observed in all leaves. A significant and negative relationship was detected between energy-dependent quenching (qE) and photoinhibition percent in three species under specific PPFD conditions, whereas a significant and positive relationship was detected between photoinhibitory quenching (qI) and photoinhibition percent. The qE and qI can be easily measured in the field and provide useful ecological indexes for E. dentata species restoration, habitat creation, and monitoring.

本研究旨在研究不同光合光子通量密度(ppfd)作用下齿状Eulophia dentata及其伴侣白芨formosana和Saccharum spontanum的光合性能和叶绿素荧光(ChlF)参数差异。叶片表面分别以50、100(低ppfd)、300、500、800(中等ppfd)照射;1000年;1500年;和2000 μmol m-2·s-1(高ppfd),全程测定ChlF参数。各叶片ChlF的非光化学猝灭增加,暗恢复过程中PSII的潜在量子效率、实际量子效率和量子效率比均降低。在特定PPFD条件下,三种植物的能量依赖猝灭(qE)和光抑制率呈显著负相关,而光抑制猝灭(qI)和光抑制率呈显著正相关。qE和qI可以在野外方便地测量,为齿齿苋物种恢复、生境创造和监测提供了有用的生态指标。
{"title":"Photosynthetic responses of <i>Eulophia dentata</i>, <i>Bletilla formosana</i>, and <i>Saccharum spontaneum</i> under various photosynthetic photon flux density conditions.","authors":"Y-H Lai, K-H Lin, C-P Liu, T-S Liao, M-Y Huang, C-W Wang, C-I Chen","doi":"10.32615/ps.2022.050","DOIUrl":"10.32615/ps.2022.050","url":null,"abstract":"<p><p>This study aimed to determine the photosynthetic performance and differences in chlorophyll fluorescence (ChlF) parameters between <i>Eulophia dentata</i> and its companion species <i>Bletilla formosana</i> and <i>Saccharum spontaneum</i> when subjected to different photosynthetic photon flux density (PPFDs). Leaf surfaces were then illuminated with 50, 100 (low PPFDs), 300, 500, 800 (moderate PPFDs); 1,000; 1,500; and 2,000 (high PPFDs) μmol m<sup>-2</sup>·s<sup>-1</sup>, and the ChlF parameters were measured during the whole process. Increasing nonphotochemical quenching of ChlF and decreasing potential quantum efficiency of PSII, actual quantum efficiency of PSII, and quantum efficiency ratio of PSII in dark recovery from 0-60 min were observed in all leaves. A significant and negative relationship was detected between energy-dependent quenching (q<sub>E</sub>) and photoinhibition percent in three species under specific PPFD conditions, whereas a significant and positive relationship was detected between photoinhibitory quenching (q<sub>I</sub>) and photoinhibition percent. The q<sub>E</sub> and q<sub>I</sub> can be easily measured in the field and provide useful ecological indexes for <i>E. dentata</i> species restoration, habitat creation, and monitoring.</p>","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"40 1","pages":"539-548"},"PeriodicalIF":2.1,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11558585/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85083842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes in the photosynthetic performance, the activity of enzymes of nitrogen metabolism, and proline content in the leaves of wheat plants after exposure to low CO2 concentration. 低CO2处理后小麦叶片光合性能、氮代谢酶活性及脯氨酸含量的变化
IF 2.1 4区 生物学 Q2 PLANT SCIENCES Pub Date : 2022-12-01 eCollection Date: 2023-01-01 DOI: 10.32615/ps.2022.047
A Ivanov, A Kosobryukhov, V Kreslavski, S I Allakhverdiev

The changes in photosynthetic activity, as well as the activity of nitrogen-metabolism enzymes, the intensity of lipid peroxidation, and proline content were studied in Triticum aestivum L. plants after their incubation at a low CO2 concentration in a sealed chamber for 10 d. CO2 deficiency (-CO2) compared to normal CO2 concentration (control) led to a decrease in the rate of O2 gas exchange at the plateau of the light curve and quantum yield of photosynthesis. The maximum and effective quantum photochemical yields also decreased. CO2 deficiency reduced the activity of nitrate reductase, but increased the activities of nitrite reductase, glutamine synthetase, and glutamate dehydrogenase, and promoted proline accumulation. It is assumed that with a lack of CO2, an excess of nitrogen-containing compounds occurs, which must be removed from metabolic processes. Also, we suggest the partial storage of nitrogen in the form of nitrogen-containing compounds such as proline.

短句来源研究了低浓度CO2密闭培养10 d后小麦叶片光合活性、氮代谢酶活性、脂质过氧化强度和脯氨酸含量的变化。与正常CO2浓度(对照)相比,CO2缺乏(-CO2)导致光曲线平台处O2气体交换速率和光合作用量子产率下降。最大和有效量子光化学产率也有所下降。CO2缺乏降低了硝酸盐还原酶的活性,提高了亚硝酸盐还原酶、谷氨酰胺合成酶和谷氨酸脱氢酶的活性,促进了脯氨酸的积累。据推测,由于缺乏二氧化碳,会产生过量的含氮化合物,这些化合物必须从代谢过程中去除。此外,我们建议部分氮以脯氨酸等含氮化合物的形式储存。
{"title":"Changes in the photosynthetic performance, the activity of enzymes of nitrogen metabolism, and proline content in the leaves of wheat plants after exposure to low CO<sub>2</sub> concentration.","authors":"A Ivanov, A Kosobryukhov, V Kreslavski, S I Allakhverdiev","doi":"10.32615/ps.2022.047","DOIUrl":"10.32615/ps.2022.047","url":null,"abstract":"<p><p>The changes in photosynthetic activity, as well as the activity of nitrogen-metabolism enzymes, the intensity of lipid peroxidation, and proline content were studied in <i>Triticum aestivum</i> L. plants after their incubation at a low CO<sub>2</sub> concentration in a sealed chamber for 10 d. CO<sub>2</sub> deficiency (-CO<sub>2</sub>) compared to normal CO<sub>2</sub> concentration (control) led to a decrease in the rate of O<sub>2</sub> gas exchange at the plateau of the light curve and quantum yield of photosynthesis. The maximum and effective quantum photochemical yields also decreased. CO<sub>2</sub> deficiency reduced the activity of nitrate reductase, but increased the activities of nitrite reductase, glutamine synthetase, and glutamate dehydrogenase, and promoted proline accumulation. It is assumed that with a lack of CO<sub>2</sub>, an excess of nitrogen-containing compounds occurs, which must be removed from metabolic processes. Also, we suggest the partial storage of nitrogen in the form of nitrogen-containing compounds such as proline.</p>","PeriodicalId":20157,"journal":{"name":"Photosynthetica","volume":"12 1","pages":"190-202"},"PeriodicalIF":2.1,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11515816/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88407908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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