Pub Date : 2023-06-01DOI: 10.4067/s0717-66432023000100038
Roberto Niculcar, Víctor Fajardo, Pedro Cuadra
In recent decades the fluence of ultraviolet-B (UV-B) radiation striking the ground has increased as a consequence of ozone depletion at southern latitudes. This phenomenon has sparked much interest in unravelling how plants acclimate to this condition. UV-B radiation triggers several responses that affect plant physiology, morphology and biochemistry. In this study, the effects of supplemental UV-B radiation on plant architecture, UV-B absorbing compounds and photosynthetic pigments were analyzed in two cosmopolitan species. A different range of responsiveness was found in the morphological parameters (leaf area, length and width; plant height) of species. The effects on photosynthetic pigment content and the UV-B absorbing compounds were studied through absorbance measurements. The obtained data showed that only carotenoids increased in irradiated plants of R. rhabarabarum. Likewise, an increase in the UV-B absorbing compounds content was found in irradiated plants from the same species. This effect may be regarded as a chemical protection against the damaging effects of light in photosynthesis and against oxidative cell damage. UV-B radiation induced photomorphogenic responses. In fact, all the morphological parameters of P. lanceolata were increased. The clear increase shown in leaf size and plant height suggest that cell division and stem elongation and/or differentiation processes are stimulated by UV-B radiation. These changes can be seen as an eustress effect and may indicate that plants are physiologically adapted to this level of UV-B radiation.
近几十年来，由于南纬地区臭氧耗竭，照射到地面的紫外线- b (UV-B)辐射增加了。这一现象引发了人们对揭示植物如何适应这种条件的兴趣。UV-B辐射引发了几种影响植物生理、形态和生物化学的反应。在本研究中，分析了补充UV-B辐射对两种世界性植物的结构、吸收UV-B的化合物和光合色素的影响。不同形态参数(叶面积、叶长、叶宽)的响应性不同;种的株高。通过吸光度测定，研究了其对光合色素含量和UV-B吸收化合物的影响。结果表明，辐照后的黄颡鱼只有类胡萝卜素增加。同样，在同一物种的辐照植物中发现吸收UV-B的化合物含量增加。这种作用可以被认为是一种化学保护，防止光在光合作用中的破坏作用和防止氧化细胞损伤。UV-B辐射诱导光形态形成反应。事实上，杉木的所有形态参数都增加了。叶片大小和株高的明显增加表明，UV-B辐射刺激了细胞分裂和茎伸长和/或分化过程。这些变化可以看作是一种胁迫效应，可能表明植物在生理上适应了这种水平的UV-B辐射。
{"title":"Effects of UV-B radiation on the morphology, UV-B absorbing compounds and photosynthetic pigment content of Plantago lanceolata and Rheum rhabarbarum","authors":"Roberto Niculcar, Víctor Fajardo, Pedro Cuadra","doi":"10.4067/s0717-66432023000100038","DOIUrl":"https://doi.org/10.4067/s0717-66432023000100038","url":null,"abstract":"In recent decades the fluence of ultraviolet-B (UV-B) radiation striking the ground has increased as a consequence of ozone depletion at southern latitudes. This phenomenon has sparked much interest in unravelling how plants acclimate to this condition. UV-B radiation triggers several responses that affect plant physiology, morphology and biochemistry. In this study, the effects of supplemental UV-B radiation on plant architecture, UV-B absorbing compounds and photosynthetic pigments were analyzed in two cosmopolitan species. A different range of responsiveness was found in the morphological parameters (leaf area, length and width; plant height) of species. The effects on photosynthetic pigment content and the UV-B absorbing compounds were studied through absorbance measurements. The obtained data showed that only carotenoids increased in irradiated plants of R. rhabarabarum. Likewise, an increase in the UV-B absorbing compounds content was found in irradiated plants from the same species. This effect may be regarded as a chemical protection against the damaging effects of light in photosynthesis and against oxidative cell damage. UV-B radiation induced photomorphogenic responses. In fact, all the morphological parameters of P. lanceolata were increased. The clear increase shown in leaf size and plant height suggest that cell division and stem elongation and/or differentiation processes are stimulated by UV-B radiation. These changes can be seen as an eustress effect and may indicate that plants are physiologically adapted to this level of UV-B radiation.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":"243 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135195776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.4067/s0717-66432023000100064
Eduardo Alanís-Rodríguez, Arturo Mora-Olivo, Víctor Manuel Molina-Guerra, Ana María Patiño-Flores, José Ángel Sigala-Rodríguez, Eréndira Zamudio-Castillo, Ernesto Rubio-Camacho
Pub Date : 2023-01-01DOI: 10.35513/botlit.2023.1.2
Amina Chaker, Kheireddine Fekroune, Amina Hassaine, A. Slimani, Labiba Zerari, R. Moulaï
New information on the diversity of lichen flora of the Edough Peninsula in Algeria is presented and analysed. This study aimed to estimate the diversity of corticolous lichens on the rhytidome of Quercus suber L. in the district of Seraïdi, Annaba town, which is situated in north-eastern Algeria. During this study, nineteen species new to the Edough Peninsula were identified. Two species of the Pannariaceae family, Pectenia plumbea (Lightf.) P.M. Jørg, L. Lindblom, Wedin & S. Ekman and Fuscopannaria leucosticta (Tuck.) P.M. Jørg., are rare in the region. Pectenia plumbea is a new species to the region, whereas Fuscopannaria leucosticta is new to the region and, after a long time, was rediscovered in Algeria.
介绍并分析了阿尔及利亚埃多夫半岛地衣植物区系多样性的新资料。本研究旨在对阿尔及利亚东北部安纳巴镇Seraïdi地区栎树(Quercus suber L.)皱皮上皮质地衣的多样性进行研究。在这项研究中，发现了19个艾多半岛的新物种。核桃科核桃属(Pectenia plumbea)二种下午Jørg, L. Lindblom, Wedin & S. Ekman and Fuscopannaria leucosticta (Tuck.)下午Jørg。，在该地区很少见。Pectenia plumbea是该地区的新物种，而Fuscopannaria leucosticta是该地区的新物种，经过很长一段时间，在阿尔及利亚被重新发现。
{"title":"New data on lichen flora of the Edough Peninsula in north-eastern Algeria","authors":"Amina Chaker, Kheireddine Fekroune, Amina Hassaine, A. Slimani, Labiba Zerari, R. Moulaï","doi":"10.35513/botlit.2023.1.2","DOIUrl":"https://doi.org/10.35513/botlit.2023.1.2","url":null,"abstract":"New information on the diversity of lichen flora of the Edough Peninsula in Algeria is presented and analysed. This study aimed to estimate the diversity of corticolous lichens on the rhytidome of Quercus suber L. in the district of Seraïdi, Annaba town, which is situated in north-eastern Algeria. During this study, nineteen species new to the Edough Peninsula were identified. Two species of the Pannariaceae family, Pectenia plumbea (Lightf.) P.M. Jørg, L. Lindblom, Wedin & S. Ekman and Fuscopannaria leucosticta (Tuck.) P.M. Jørg., are rare in the region. Pectenia plumbea is a new species to the region, whereas Fuscopannaria leucosticta is new to the region and, after a long time, was rediscovered in Algeria.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":"35 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85150098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.35513/botlit.2023.1.4
Z. Sinkevičienė
This research aimed to verify the identification and distribution of Myriophyllum sibiricum in Lithuania. The study was based on a revision of available herbarium specimens and information from archival materials and literature sources. A total of 134 herbarium specimens of Myriophyllum, mainly initially identified as Myriophyllum spicatum, were examined. After revision of herbarium specimens, 101 of these were identified as Myriophyllum sibiricum. The remaining 33 herbarium specimens were tentatively determined as hybrids Myriophyllum sibiricum × Myriophyllum spicatum. None of the specimens were identified as Myriophyllum spicatum. The distribution of Myriophyllum sibiricum is related mainly to standing waters of upland regions, while localities of putative hybrid scattered throughout the area and associated with upland lakes and river stretches. The morphological features of the leaves (number of segments pairs and its angle with the central axis, occurrence of glands at the base of young leaves and in axils of leaves segments) are helpful to distinguish typical specimens of Myriophyllum sibiricum from Myriophyllum spicatum, however useless for their separation from the hybrid. This study revealed that further research on Myriophyllum sibiricum, Myriophyllum spicatum and their putative hybrid must apply morphological and molecular methods.
{"title":"Remarks on Myriophyllum sibiricum, a long-time unrecognised species of the flora of Lithuania","authors":"Z. Sinkevičienė","doi":"10.35513/botlit.2023.1.4","DOIUrl":"https://doi.org/10.35513/botlit.2023.1.4","url":null,"abstract":"This research aimed to verify the identification and distribution of Myriophyllum sibiricum in Lithuania. The study was based on a revision of available herbarium specimens and information from archival materials and literature sources. A total of 134 herbarium specimens of Myriophyllum, mainly initially identified as Myriophyllum spicatum, were examined. After revision of herbarium specimens, 101 of these were identified as Myriophyllum sibiricum. The remaining 33 herbarium specimens were tentatively determined as hybrids Myriophyllum sibiricum × Myriophyllum spicatum. None of the specimens were identified as Myriophyllum spicatum. The distribution of Myriophyllum sibiricum is related mainly to standing waters of upland regions, while localities of putative hybrid scattered throughout the area and associated with upland lakes and river stretches. The morphological features of the leaves (number of segments pairs and its angle with the central axis, occurrence of glands at the base of young leaves and in axils of leaves segments) are helpful to distinguish typical specimens of Myriophyllum sibiricum from Myriophyllum spicatum, however useless for their separation from the hybrid. This study revealed that further research on Myriophyllum sibiricum, Myriophyllum spicatum and their putative hybrid must apply morphological and molecular methods.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":"50 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81478706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","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：