Time‐series transcriptomics reveals a BBX32‐directed control of acclimation to high light in mature Arabidopsis leaves

拟南芥 生物 适应 转录组 光形态发生 叶绿体 基因 转录因子 遗传学 基因表达 细胞生物学 光合作用 植物 突变体
作者
Rubén Álvarez-Fernández,Christopher A. Penfold,Gregorio Gálvez‐Valdivieso,Marino Expósito‐Rodríguez,Ellie J. Stallard,Laura Bowden,Jonathan D. Moore,Andrew Mead,Phillip Davey,Jack S. A. Matthews,Jim Beynon,Vicky Buchanan‐Wollaston,David L. Wild,Tracy Lawson,Ulrike Bechtold,Katherine Denby,Philip M. Mullineaux
出处
期刊:Plant Journal [Wiley]
卷期号:107 (5): 1363-1386 被引量:19
标识
DOI:10.1111/tpj.15384
摘要

SUMMARY The photosynthetic capacity of mature leaves increases after several days’ exposure to constant or intermittent episodes of high light (HL) and is manifested primarily as changes in chloroplast physiology. How this chloroplast‐level acclimation to HL is initiated and controlled is unknown. From expanded Arabidopsis leaves, we determined HL‐dependent changes in transcript abundance of 3844 genes in a 0–6 h time‐series transcriptomics experiment. It was hypothesized that among such genes were those that contribute to the initiation of HL acclimation. By focusing on differentially expressed transcription (co‐)factor genes and applying dynamic statistical modelling to the temporal transcriptomics data, a regulatory network of 47 predominantly photoreceptor‐regulated transcription (co‐)factor genes was inferred. The most connected gene in this network was B‐BOX DOMAIN CONTAINING PROTEIN32 ( BBX32 ). Plants overexpressing BBX32 were strongly impaired in acclimation to HL and displayed perturbed expression of photosynthesis‐associated genes under LL and after exposure to HL. These observations led to demonstrating that as well as regulation of chloroplast‐level acclimation by BBX32 , CRYPTOCHROME1, LONG HYPOCOTYL5 , CONSTITUTIVELY PHOTOMORPHOGENIC1 and SUPPRESSOR OF PHYA‐105 are important. In addition, the BBX32 ‐centric gene regulatory network provides a view of the transcriptional control of acclimation in mature leaves distinct from other photoreceptor‐regulated processes, such as seedling photomorphogenesis.
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