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首页> 外文期刊>Soil Science and Plant Nutrition >O2-enhanced induction of photosynthesis in rice leaves: the Mehler-ascorbate peroxidase (MAP) pathway drives cyclic electron flow within PSII and cyclic electron flow around PSI.
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O2-enhanced induction of photosynthesis in rice leaves: the Mehler-ascorbate peroxidase (MAP) pathway drives cyclic electron flow within PSII and cyclic electron flow around PSI.

机译：O 2 增强水稻叶片光合作用的诱导：梅勒-抗坏血酸过氧化物酶（MAP）途径驱动PSII中的循环电子流和PSI周围的循环电子流。

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摘要

Lowering the oxygen (O2) partial pressure from 21 kPa to 1 kPa delayed the light-dependent increase of the net carbon dioxide (CO2) assimilation rate in rice (Oryza sativa L. cv. Notohikari) leaves. Researching the underlying molecular mechanisms that act before the start of photosynthesis, we established the following facts. First, O2 at 21 kPa enhanced the quantum yield of PSII [Y(II)] and PSI [Y(I)]. More than 90% of Y(II) and Y(I) were not accounted for by O2-dependent electron flow in the Mehler-ascorbate peroxidase (MAP) pathway. Both yields increased further with the start of photosynthesis. Second, O2 enhanced photochemical quenching of chlorophyll (Chl) fluorescence (qL). qL also increased further with the rate of photosynthesis. Third, O2 enhanced the photo-oxidation of P700. Fourth, O2 suppressed the reduction of P700. Fifth, O2 enhanced non-photochemical quenching of Chl fluorescence (NPQ). These results showed that the MAP pathway triggered cyclic electron flow within PSII (CEF-II) and cyclic electron flow around PSI (CEF-I) by inducing Delta pH across thylakoid membranes and oxidizing the plastoquinone pool, before photosynthesis started. We propose that the photosynthetic electron transport system is controlled by the MAP pathway, which would explain the O2-dependent enhancement of the induction of photosynthesis.
机译：将氧气（O 2 ）的分压从21 kPa降低到1 kPa可以延迟水稻（Oryza）中净二氧化碳（CO 2 ）同化率的光依赖性增加sativa L. cv。Notohikari）叶子。研究光合作用开始之前起作用的潜在分子机制，我们建立了以下事实。首先，在21 kPa的O 2 增强了PSII [Y（II）]和PSI [Y（I）]的量子产率。超过90％的Y（II）和Y（I）未被Mehler-抗坏血酸过氧化物酶（MAP）途径中O 2 依赖的电子流所占。随着光合作用的开始，两种产量都进一步增加。其次，O 2 增强了叶绿素（Chl）荧光（qL）的光化学猝灭。 qL也随着光合作用的速率进一步增加。第三，O 2 增强了P700的光氧化作用。第四，O 2 抑制了P700的还原。第五，O 2 增强了Chl荧光（NPQ）的非光化学猝灭。这些结果表明，在光合作用开始之前，MAP途径通过在类囊体膜上诱导Delta pH并氧化质体醌池，从而触发PSII（CEF-II）内的循环电子流和PSI（CEF-I）周围的循环电子流。我们认为光合作用的电子传输系统受MAP路径的控制，这可以解释O 2 依赖的光合作用增强作用。

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