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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >High light acclimation of Oryza sativa L. leaves involves specific photosynthetic-sourced changes of NADPH/NADP(+) in the midvein
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High light acclimation of Oryza sativa L. leaves involves specific photosynthetic-sourced changes of NADPH/NADP(+) in the midvein

机译：水稻叶片的强光适应涉及中脉中NADPH / NADP（+）的特定光合作用来源变化

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Previous studies have shown that exposure of Arabidopsis leaves to high light (HL) causes a systemic acquired acclimation (SAA) response in the vasculature. It has been postulated that C-4-like photosynthesis in the leaf veins triggers this response via the Mehler reaction. To investigate this proposed connection and extend SAA to other plants, we examined the redox state of NADPH, ascorbate (ASA), and glutathione (GSH) pools; levels and histochemical localization of O-2- and H2O2 signals; and activities of antioxidant enzymes in the midvein and leaf lamina of rice, when they were subjected to HL and low light. The results showed that (1) high NADPH/NADP(+) was generated by C-4-like photosynthesis under HL in the midvein and (2) SAA was colocally induced by HL, as indicated by the combined signaling network, including the decrease in redox status of ASA and GSH pools, accumulation of H2O2 and O-2- signals, and high superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities. The high correlations between these occurrences suggest that the enhanced NADPH/NADP(+) in HL-treated midveins might alter redox status of ASA and GSH pools and trigger H2O2 and O-2- signals during SAA via the Mehler reaction. These changes in turn upregulate SOD and APX activities in the midvein. In conclusion, SAA may be a common regulatory mechanism for the adaptation of angiosperms to HL. Manipulation of NADPH/NADP(+) levels by C-4-like photosynthesis promotes SAA under HL stress in the midvein.
机译：先前的研究表明，拟南芥叶片暴露于高光（HL）会引起脉管系统的系统性适应性适应（SAA）反应。据推测，叶静脉中的C-4样光合作用通过Mehler反应触发该响应。为了研究这种拟议的联系并将SAA扩展到其他植物，我们研究了NADPH，抗坏血酸（ASA）和谷胱甘肽（GSH）库的氧化还原状态。 O-2-和H2O2信号的水平和组织化学定位; HL和弱光下水稻中脉和叶片的抗氧化酶活性及活性结果表明：（1）高NADPH / NADP（+）是由中脉在HL下通过C-4样光合作用产生的;（2）SAA是由HL共定位的，如联合信号网络所表明的那样，包括降低在ASA和GSH池的氧化还原状态中，H2O2和O-2-信号的积累，以及超氧化物歧化酶（SOD）和抗坏血酸过氧化物酶（APX）的高活性。这些发生之间的高度相关性表明，HL处理的中脉中增强的NADPH / NADP（+）可能会通过Mehler反应改变SAA和GSH池的氧化还原状态并触发SAA期间的H2O2和O-2-信号。这些变化反过来会上调中脉的SOD和APX活动。总之，SAA可能是被子植物适应HL的常见调控机制。通过C-4-样光合作用操纵NADPH / NADP（+）水平可在中脉中的HL胁迫下促进SAA。

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