Wang, F, Wu, N, Zhang, L et al. (9 more authors) (2018) Light Signaling-dependent Regulation of Photoinhibition and Photoprotection in Tomato. Plant Physiology, 176 (2). pp. 1311-1326. ISSN 0032-0889
Abstract
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 plants. This protection is accompanied by a phytochrome A (phyA)-dependent induction of LONG HYPOCOTYL 5 (HY5). HY5 binds to the promoter of ABA INSENSITIVE 5 (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 non-photochemical 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 (PGR5)-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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 American Society of Plant Biologists. This is an author produced version of a paper published in Plant Physiology Preview. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biology (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Dec 2017 16:54 |
Last Modified: | 20 Jan 2021 11:45 |
Status: | Published |
Publisher: | American Society of Plant Biologists |
Identification Number: | 10.1104/pp.17.01143 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125018 |