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首页> 外文期刊>Russian Journal of Plant Physiology >Contribution of photorespiration to changes of carbon isotope characteristics in plants affected by stress factors [Review]
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Contribution of photorespiration to changes of carbon isotope characteristics in plants affected by stress factors [Review]

机译：光呼吸对受胁迫因素影响的植物碳同位素特征变化的贡献[综述]

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摘要

Experimental data available in literature on changes in the carbon isotopic composition of biochemical fractions and metabolites isolated from plant biomass (Clusia minor) and photosynthesizing algae (Chlorella stigmatophora) under the action of environmental stress factors are reviewed and analyzed. Within the framework of previously suggested mechanism of carbon isotope fractionation in photosynthesis, all studied fractions and metabolites obtained from plants and photosynthesizing algae can be divided into two groups according to their carbon isotope composition. The first group includes the fractions and metabolite pools that contain carbon stored by cell during the carboxylase phase of Rubisco functioning. The second group consists of those formed primarily by the photorespiratory carbon flow, generated during the oxygenase phase of Rubisco functioning. The first group represents the "assimilatory" branch of photosynthesis and is enriched in C-12 relative to carbon of biomass, whereas the second group represents the "photorespiratory" branch and is enriched in C-13. Under the action of environmental stress factors, such as incident light intensity, moisture availability, and salinity; the isotope composition of metabolites and fractions changes, which reflects variable contributions of the "assimilatory" and "photorespiratory" flows to the metabolite synthesis. These isotope shifts were used to study biochemical adaptation of plants to stress conditions and to elucidate the role of photorespiration in this adaptation.
机译：审查和分析了在环境胁迫因素的作用下，从植物生物量（小克鲁斯）和光合藻（小球藻）中分离出的生化部分和代谢产物的碳同位素组成变化的实验数据。在先前提出的碳同位素在光合作用中的分馏机制的框架内，从植物和光合藻类中获得的所有研究馏分和代谢物都可以根据其碳同位素组成分为两组。第一组包括馏分和代谢物库，其中包含在Rubisco功能的羧化酶阶段细胞所储存的碳。第二组由主要由光呼吸碳流形成的那些组成，这些光流是在Rubisco功能的加氧酶阶段产生的。第一组代表光合作用的“同化”分支，相对于生物质碳，C-12富集，而第二组代表“光呼吸”分支，并富集C-13。在环境压力因素的作用下，例如入射光强度，水分可用性和盐度;代谢物和馏分的同位素组成发生变化，这反映了“同化”和“光呼吸”流对代谢物合成的不同贡献。这些同位素变化被用于研究植物对胁迫条件的生化适应性，并阐明光呼吸在这种适应性中的作用。

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