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首页> 外文会议>Photosynthesis research for food, fuel and future >Methylmethionine (Vitamin U) Alleviates Negative Effects of Chemical Stressors on Photosynthesis of the Green Alga Scenedesmus Opoliensis
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Methylmethionine (Vitamin U) Alleviates Negative Effects of Chemical Stressors on Photosynthesis of the Green Alga Scenedesmus Opoliensis

机译：甲基蛋氨酸（维生素U）减轻化学胁迫对绿藻Scenedesmus Opoliensis光合作用的负面影响

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摘要

Investigation of stress tolerance in unicellular algae represents an experimental approach that contributes to elucidation of cellular events related to stress-induced metabolic and developmental reactions in plants. In this context, we investigated the interaction of methylmethionine (vitamin U) with environmental stress factors (high concentrations of heavy metals, herbicides) in photosynthetic energy conversion, net oxygen evolution and dry biomass production of the green microalga Scenedesmus opoliensis. Parameters of the induced chlorophyll fluorescence reveal the benefic influence of vitamin U on light use efficiency of photochemical reactions, as well as on the organization of light-harvesting pigment-protein complexes of the thylakoid membranes in algal cells exposed to micromolar concentrations of cadmium. Oxidative damage caused by the herbicide methylviologen is diminished by methylmethionine. The activities of ascorbate peroxidase and superoxide dismutase are enhanced in the algal cells exposed to the combined effect of methylviologen and vitamin U. In the absence of stress factors, vitamin U has no significant influence on the investigated physiological parameters. Further studies on the protective role of methylmethionine in the presence of stress factors may provide a better insight into the mechanisms of antistress reactions of plants grown in unfavorable environments.
机译：对单细胞藻类的胁迫耐受性的研究代表了一种实验方法，有助于阐明与胁迫诱导的植物代谢和发育反应有关的细胞事件。在此背景下，我们研究了甲基蛋氨酸（维生素U）与环境胁迫因素（高浓度的重金属，除草剂）在绿色微藻opcenensis的光合作用转化，净氧释放和干生物量生产中的相互作用。诱导的叶绿素荧光参数揭示了维生素U对光化学反应光利用效率的有益影响，以及暴露于微摩尔浓度镉的藻类细胞中类囊体膜的光收集色素-蛋白质复合物的组织。甲基蛋氨酸可减少由除草剂甲基紫精引起的氧化损伤。在暴露于甲基紫精和维生素U共同作用的藻类细胞中，抗​​坏血酸过氧化物酶和超氧化物歧化酶的活性得到增强。在没有压力因素的情况下，维生素U对所研究的生理参数没有显着影响。对甲基蛋氨酸在胁迫因素存在下的保护作用的进一步研究，可以为在不利环境下生长的植物的抗胁迫反应机理提供更好的见解。

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