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首页> 外文期刊>Russian Journal of Plant Physiology >Stress-dependent accumulation of spermidine and spermine in the halophyte Mesembryanthemum crystallinum under salinity conditions.
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Stress-dependent accumulation of spermidine and spermine in the halophyte Mesembryanthemum crystallinum under salinity conditions.

机译：盐度条件下盐生植物菊花膜中亚精胺和亚精胺的应力依赖性积累。

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摘要

The effects of chloride salinity (300 and 500 mM NaCl) on the content of free polyamines (PAs) from putrescine (Put) family in Mesembryanthemum crystallinum leaves and roots were studied. The contents of Put and spermidine (Spd) in leaves increased temporarily, achieving the highest values on the third day of salinity treatment; thereafter (by days 7-14), they dropped sharply. The content of spermine (Spm) increased gradually, and its high level was maintained until the end of experiment. The dynamics of Spm accumulation in leaves under salinity conditions resembled that of phosphoenolpyruvate carboxylase (PEPC), a key enzyme of the water-saving CAM pathway of photosynthesis. This indicates indirectly the involvement of Spm in the common ice plant adaptation to salinity. A decrease in the molar ratios of Spd to Spm in the leaves under salinity conditions could point to the acceleration of Spm biosynthesis (accumulation) during plant adaptation, whereas the levels of Spm precursors, Put and Spd, did not increase. This phenomenon could be explained by an accelerated conversion of Spd into Spm, an active liberation of free Spm from its conjugates, or changes in the rates of studied PA biosynthesis and degradation under salinity. At the same time, the intracellular concentration of ethylene rose under these conditions. It was supposed and then demonstrated, that the pathway of ethylene biosynthesis and that of the synthesis of Put family PAs compete under severe salinity conditions. This competition might be based on the disturbances in sulfur metabolism and a decrease in the methionine content, an immediate precursor of S-adenosyl-L-methionine..
机译：研究了氯化盐度（300和500 mM NaCl）对结晶膜叶片和根中腐胺（Put）家族游离多胺（PAs）含量的影响。叶片中Put和亚精胺（Spd）的含量暂时增加，在盐度处理的第三天达到最高值;此后（到第7-14天），它们急剧下降。精胺（Spm）的含量逐渐增加，并保持高水平直至实验结束。盐分条件下叶片中Spm积累的动态类似于磷酸烯醇丙酮酸羧化酶（PEPC），后者是光合作用节水CAM途径的关键酶。这间接表明Spm参与了普通冰厂对盐度的适应。在盐度条件下，叶片中Spd与Spm的摩尔比降低可能表明在植物适应过程中Spm生物合成（积累）的加速，而Spm前体Put和Spd的水平并未增加。这种现象可以通过Spd加速转化为Spm，从其结合物中主动释放游离Spm或盐度下研究的PA生物合成和降解速率变化来解释。同时，在这些条件下乙烯的细胞内浓度上升。推测然后证明，在严格的盐度条件下，乙烯的生物合成途径和Put家族PA的合成途径竞争。这种竞争可能是基于硫代谢的紊乱和蛋氨酸含量的下降，蛋氨酸的含量是S-腺苷-L-蛋氨酸的直接前体。

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