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首页> 外文OA文献 >Dark Ammonium Assimilation Reduces the Plastoquinone Pool of Photosystem II in the Green Alga Selenastrum minutum 1
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Dark Ammonium Assimilation Reduces the Plastoquinone Pool of Photosystem II in the Green Alga Selenastrum minutum 1

机译：暗铵吸收减少了绿藻硒1中光系统II的醌醌池

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摘要

The impact of dark NH4+ and NO3− assimilation on photosynthetic light harvesting capability of the green alga Selenastrum minutum was monitored by chlorophyll a fluorescence analysis. When cells assimilated NH4+, they exhibited a large decline in the variable fluorescence/maximum fluorescence ratio, the fluorescence yield of photosystem II relative to that of photosystem I at 77 kelvin, and O2 evolution rate. NH4+ assimilation therefore poised the cells in a less efficient state for photosystem II. The analysis of complementary area of fluorescence induction curve and the pattern of fluorescence decay upon microsecond saturating flash, indicators of redox state of plastoquinone (PQ) pool and dark reoxidation of primary quinone electron acceptor (QA), respectively, revealed that the PQ pool became reduced during dark NH4+ assimilation. NH4+ assimilation also caused an increase in the NADPH/NADP+ ratio due to the NH4+ induced increase in respiratory carbon oxidation. The change in cellular reductant is suggested to be responsible for the reduction of the PQ pool and provide a mechanism by which the metabolic demands of NH4+ assimilation may alter the efficiency of photosynthetic light harvesting. NO3− assimilation did not cause a reduction in PQ and did not affect the efficiency of light harvesting. These results illustrate the role of cellular metabolism in the modulating photosynthetic processes.
机译：叶绿素a荧光分析监测了暗NH4 +和NO3-的同化作用对绿藻小夜蛾光合光收集能力的影响。当细胞吸收NH4 +时，它们的可变荧光/最大荧光比率，光系统II相对于光系统I的荧光产量（开尔文）为77开尔文和O2释放速率表现出很大的下降。因此，NH4 +同化会使细胞处于光系统II效率较低的状态。分析荧光诱导曲线的互补区域和微秒饱和闪光后的荧光衰减模式，质体醌（PQ）池的氧化还原状态指标和伯醌电子受体（QA）的黑暗再氧化指标，表明PQ池变为在暗NH4 +同化过程中减少。 NH4 +同化也导致NADPH / NADP +比值增加，这是由于NH4 +引起的呼吸碳氧化增加。提示细胞还原剂的变化是造成PQ库减少的原因，并提供了一种机制，NH4 +同化作用的代谢需求可能会改变光合光收集的效率。 NO3-同化不会导致PQ降低，也不会影响光收集效率。这些结果说明了细胞代谢在调节光合作用过程中的作用。

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