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首页> 外文期刊>Photosynthesis Research >Inhibition of Photosystem I and Photosystem II in Wheat Seedlings with their Root–shoot Transition Zones Exposed to Red Light
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Inhibition of Photosystem I and Photosystem II in Wheat Seedlings with their Root–shoot Transition Zones Exposed to Red Light

机译：小麦幼苗的根茎过渡区暴露于红光下对光系统I和光系统II的抑制

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摘要

The present study was conducted to observe the role of the root—shoot transition zone in the development of PS I and PS II in red light. The development of PS II and PS I was severely inhibited when root—shoot transition zones of wheat seedlings were exposed to red light (670 nm) of intensity 500 µmol m−2 s−1. Chlorophyll biosynthesis was also inhibited in these seedlings. Most of the PS I and PS II proteins (D1, LHCPII, CP47, OEC33) and their transcript levels were severely inhibited but cyt b6f complex proteins were only partially inhibited. Protein and transcript levels of Rubisco large subunit and protochlorophyllide (Pchlide) biosynthesis were also severely inhibited in these seedlings. When incubated in the dark with or without the precursor of chlorophyll biosynthesis ALA, these plants accumulated most of the Pchlide, as non-phototransformable Pchlide, suggesting low activity of NADPH:protochlorophyllide oxidoreductase (EC 1.6.99.1) in these plants. These effects were not observed when the seedlings were grown in red light with their root—shoot transition zones covered. These results suggest that the root—shoot transition zone plays an important role in the overall greening process involving transcription and translation of photosynthetic genes.
机译：进行本研究的目的是观察红光下PS I和PS II发育中根茎突过渡区的作用。当小麦幼苗的根茎过渡区暴露在强度为500 µmol m-2 s-1 的红光（670 nm）下时，PS II和PS I的发育受到严重抑制。这些幼苗中的叶绿素生物合成也受到抑制。大多数PS I和PS II蛋白（D1，LHCPII，CP47，OEC33）及其转录水平受到严重抑制，但cyt b6f复合蛋白仅被部分抑制。这些幼苗的Rubisco大亚基和原叶绿素（Pchlide）生物合成的蛋白质和转录水平也受到严重抑制。当在有或没有叶绿素生物合成ALA的前体下在黑暗中孵育时，这些植物积累了大部分的Pchlide，为不可光转化的Pchlide，表明这些植物中NADPH：protochlorochlorophyllide氧化还原酶（EC 1.6.99.1）的活性较低。当幼苗在红光下生长且其根－芽过渡区被覆盖时，未观察到这些影响。这些结果表明，根茎过渡区在涉及光合基因转录和翻译的整个绿化过程中起着重要作用。

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