Physiological Roles of Flavodiiron Proteins and Photorespiration in the Liverwort Marchantia polymorpha.
Physiological Roles of Flavodiiron Proteins and Photorespiration in the Liverwort Marchantia polymorpha.
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地钱中黄酮二铁蛋白和光呼吸的生理作用。
DOI：
10.3389/fpls.2021.668805
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发表时间：
2021
影响因子：
5.6
通讯作者：
Miyake C
中科院分区：
文献类型：
--
作者：
Shimakawa G;Hanawa H;Wada S;Hanke GT;Matsuda Y;Miyake C
针对含氧光合作用中的潜在风险，即活性氧的产生，光合电子传递需要响应于环境波动进行调节。其中最重要的调节是在过量光照条件下保持光系统I的反应中心叶绿素（P700）处于其氧化形式。P700的氧化是通过将多余的电子安全地耗散到O2中来支持的，并且我们先前发现，在从蓝藻到植物的进化历史中，交替电子汇的分子机制从黄二铁蛋白（flavodiiron proteins，FLV）转变为光呼吸。然而，光合电子传递的调节的整体画面仍然不清楚，在brabrites，进化中间体。在这里，我们调查的生理作用的FLV和光呼吸P700氧化地钱通过使用FLV（flv 1）在不同的O2分压的突变体。在2kPa O_2下，flv 1光系统II的有效量子产额显著降低，表明光呼吸起着电子汇的作用。然而，从flv 1的表型可以清楚地看出，FLV在M中对P700氧化是显性的。多形。这些数据表明，光呼吸还没有取代FLV的功能P700氧化在基地植物可能是因为较低的贡献管腔酸化，与FLV相比，反映在电致变色位移分析的结果。
Against the potential risk in oxygenic photosynthesis, that is, the generation of reactive oxygen species, photosynthetic electron transport needs to be regulated in response to environmental fluctuations. One of the most important regulations is keeping the reaction center chlorophyll (P700) of photosystem I in its oxidized form in excess light conditions. The oxidation of P700 is supported by dissipating excess electrons safely to O2, and we previously found that the molecular mechanism of the alternative electron sink is changed from flavodiiron proteins (FLV) to photorespiration in the evolutionary history from cyanobacteria to plants. However, the overall picture of the regulation of photosynthetic electron transport is still not clear in bryophytes, the evolutionary intermediates. Here, we investigated the physiological roles of FLV and photorespiration for P700 oxidation in the liverwort Marchantia polymorpha by using the mutants deficient in FLV (flv1) at different O2 partial pressures. The effective quantum yield of photosystem II significantly decreased at 2kPa O2 in flv1, indicating that photorespiration functions as the electron sink. Nevertheless, it was clear from the phenotype of flv1 that FLV was dominant for P700 oxidation in M. polymorpha. These data suggested that photorespiration has yet not replaced FLV in functioning for P700 oxidation in the basal land plant probably because of the lower contribution to lumen acidification, compared with FLV, as reflected in the results of electrochromic shift analysis.
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DOI：
10.1098/rstb.2000.0704
发表时间：
2000-10-29
影响因子：
6.3
作者：
Bader, MR;von Caemmerer, S;Nakano, H
通讯作者：
Nakano, H
影响因子：
3.7
作者：
GAMBORG, OL;MILLER, RA;OJIMA, K
通讯作者：
OJIMA, K
影响因子：
7.3
作者：
HARBINSON, J;WOODWARD, FI
通讯作者：
WOODWARD, FI
DOI：
10.1073/pnas.1221194110
发表时间：
2013-03-05
影响因子：
11.1
作者：
Allahverdiyeva, Yagut;Mustila, Henna;Aro, Eva-Mari
通讯作者：
Aro, Eva-Mari
影响因子：
7.4
作者：
Chaux, Frederic;Burlacot, Adrien;Peltier, Gilles
通讯作者：
Peltier, Gilles