光抑制
光防护
生物
叶绿素荧光
光敏色素
植物
质外体
NADPH氧化酶
生物物理学
活性氧
猝灭(荧光)
电化学梯度
化学
叶绿素
细胞生物学
光系统II
生物化学
光合作用
荧光
量子力学
物理
膜
细胞壁
红灯
作者
Feng Wang,Nan Wu,Luyue Zhang,Golam Jalal Ahammed,Xiaoxiao Chen,Xun Xiang,Jie Zhou,Xiaojian Xia,Kai Shi,Jingquan Yu,Christine H. Foyer,Yanhong Zhou
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2017-11-16
卷期号:176 (2): 1311-1326
被引量:109
摘要
Photoreceptor-mediated light signaling plays a critical role in plant growth, development, and stress responses but its contribution to the spatial regulation of photoinhibition and photoprotection within the canopy remains unclear. Here, we show that low-red/far-red (L-R/FR) ratio light conditions significantly alleviate PSII and PSI photoinhibition in the shade leaves of tomato (Solanum lycopersicum) plants. This protection is accompanied by a phytochrome A-dependent induction of LONG HYPOCOTYL5 (HY5). HY5 binds to the promoter of ABA INSENSITIVE5 (ABI5), triggering RESPIRATORY BURST OXIDASE HOMOLOG1 (RBOH1)-dependent H2O2 production in the apoplast. Decreased levels of HY5, ABI5, and RBOH1 transcripts increased cold-induced photoinhibition and abolished L-R/FR-induced alleviation of photoinhibition. L-R/FR illumination induced nonphotochemical quenching (NPQ) of chlorophyll a fluorescence and increased the activities of Foyer-Halliwell-Asada cycle enzymes and cyclic electron flux (CEF) around PSI. In contrast, decreased HY5, ABI5, and RBOH1 transcript levels abolished the positive effect of L-R/FR on photoprotection. Loss of PROTON GRADIENT REGULATION5-dependent CEF led to increased photoinhibition and attenuated L-R/FR-dependent NPQ. These data demonstrate that HY5 is an important hub in the cross talk between light and cold response pathways, integrating ABA and reactive oxygen species signaling, leading to the attenuation of photoinhibition by enhanced induction of photoprotection in shade leaves.
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