Photosynthetic control at the cytochrome b6f complex

Gustaf E Degen, Matthew P Johnson
{"title":"Photosynthetic control at the cytochrome b6f complex","authors":"Gustaf E Degen, Matthew P Johnson","doi":"10.1093/plcell/koae133","DOIUrl":null,"url":null,"abstract":"Photosynthetic control (PCON) is a protective mechanism that prevents light-induced damage to photosystem I (PSI) by ensuring the rate of NADPH and ATP production via linear electron transfer (LET) is balanced by their consumption in the CO2 fixation reactions. Protection of PSI is a priority for plants since they lack a dedicated rapid-repair cycle for this complex, meaning that any damage leads to prolonged photoinhibition and decreased growth. The imbalance between LET and the CO2 fixation reactions is sensed at the level of the transthylakoid ΔpH, which increases when light is in excess. The canonical mechanism of PCON involves feedback control by ΔpH on the plastoquinol oxidation step of LET at cytochrome b6f. PCON thereby maintains the PSI special pair chlorophylls (P700) in an oxidized state, that allows excess electrons unused in the CO2 fixation reactions to be safely quenched via charge recombination. In this review we focus on angiosperms, considering how photo-oxidative damage to PSI comes about, explore the consequences of PSI photoinhibition on photosynthesis and growth, discuss recent progress in understanding PCON regulation, and finally consider the prospects for its future manipulation in crop plants to improve photosynthetic efficiency.","PeriodicalId":501012,"journal":{"name":"The Plant Cell","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Plant Cell","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1093/plcell/koae133","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

Photosynthetic control (PCON) is a protective mechanism that prevents light-induced damage to photosystem I (PSI) by ensuring the rate of NADPH and ATP production via linear electron transfer (LET) is balanced by their consumption in the CO2 fixation reactions. Protection of PSI is a priority for plants since they lack a dedicated rapid-repair cycle for this complex, meaning that any damage leads to prolonged photoinhibition and decreased growth. The imbalance between LET and the CO2 fixation reactions is sensed at the level of the transthylakoid ΔpH, which increases when light is in excess. The canonical mechanism of PCON involves feedback control by ΔpH on the plastoquinol oxidation step of LET at cytochrome b6f. PCON thereby maintains the PSI special pair chlorophylls (P700) in an oxidized state, that allows excess electrons unused in the CO2 fixation reactions to be safely quenched via charge recombination. In this review we focus on angiosperms, considering how photo-oxidative damage to PSI comes about, explore the consequences of PSI photoinhibition on photosynthesis and growth, discuss recent progress in understanding PCON regulation, and finally consider the prospects for its future manipulation in crop plants to improve photosynthetic efficiency.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
细胞色素 b6f 复合物的光合作用控制
光合控制(PCON)是一种保护机制,通过确保通过线性电子传递(LET)产生的 NADPH 和 ATP 的速率与 CO2 固定反应中的消耗相平衡,从而防止光诱导对光子系统 I(PSI)造成损害。保护 PSI 是植物的当务之急,因为植物缺乏专门针对这一复合体的快速修复循环,这意味着任何损伤都会导致长时间的光抑制和生长衰退。LET 与 CO2 固定反应之间的不平衡可通过转紫函 ΔpH 水平来感知,当光照过量时,ΔpH 会升高。PCON 的典型机制包括 ΔpH 对细胞色素 b6f 中 LET 的质醌氧化步骤的反馈控制。因此,PCON 使 PSI 特殊配对叶绿素(P700)保持氧化状态,从而使二氧化碳固定反应中未使用的多余电子通过电荷重组被安全淬灭。在这篇综述中,我们将以被子植物为研究对象,探讨 PSI 光氧化损伤是如何产生的,探讨 PSI 光抑制对光合作用和生长的影响,讨论在了解 PCON 调节方面的最新进展,最后探讨未来在作物中利用 PCON 提高光合效率的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
The FERONIA–RESPONSIVE TO DESSICATION 26 module regulates vascular immunity to Ralstonia solanacearum Phosphoketolase and KDPG aldolase metabolisms modulate photosynthetic carbon yield in cyanobacteria The kinase ATR controls meiotic crossover distribution at the genome scale in Arabidopsis Ribosome binding of phasiRNA precursors accelerates the 24-nt phasiRNA burst in meiotic maize anthers EMBRYONIC FLOWER 1 regulates male reproduction by repressing the jasmonate pathway downstream transcription factor MYB26
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1