Brassinosteroids enhance BES1‐required thermomemory in Arabidopsis thaliana

Heat stress (HS) caused by ambient high temperature poses a threat to plants. In the natural and agricultural environment, plants often encounter repeated and changeable HS. Moderate HS primes plants to establish a molecular ‘thermomemory’ that enables plants to withstand a later‐and possibly more e...

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Published inPlant, cell and environment Vol. 45; no. 12; pp. 3492 - 3504
Main Authors Yao, Xiuhong, Li, Yanling, Chen, Juan, Zhou, Zuxu, Wen, Yu, Fang, Ke, Yang, Fabin, Li, Taotao, Zhang, Dawei, Lin, Honghui
Format Journal Article
LanguageEnglish
Published Oxford Wiley Subscription Services, Inc 01.12.2022
Subjects
Accumulation
Arabidopsis thaliana
Brassinosteroids
BRs
Dephosphorylation
Heat stress
Heat tolerance
High temperature
Priming
Signal transduction
Signaling
Synthesis
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Summary:Heat stress (HS) caused by ambient high temperature poses a threat to plants. In the natural and agricultural environment, plants often encounter repeated and changeable HS. Moderate HS primes plants to establish a molecular ‘thermomemory’ that enables plants to withstand a later‐and possibly more extreme‐HS attack. Recent years, brassinosteroids (BRs) have been implicated in HS response, whereas the information is lacking on whether BRs signal transduction modulates thermomemory. Here, we uncover the positive role of BRs signalling in thermomemory of Arabidopsis thaliana. Heat priming induces de novo synthesis and nuclear accumulation of BRI1‐Ethyl methyl sulfon‐SUPPRESSOR (BES1), which is the key regulator of BRs signalling. BRs promote the accumulation of dephosphorylated BES1 during memory phase, and stoppage of BRs synthesis impairs dephosphorylation. During HS memory, BES1 is required to maintain sustained induction of HS memory genes and directly targets APX2 and HSFA3 for activation. In summary, our results reveal a BES1‐required, BRs‐enhanced transcriptional control module of thermomemory in Arabidopsis thaliana.
Bibliography:Xiuhong Yao, Yanling Li, and Juan Chen are contributed equally to this work.
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ISSN:0140-7791
1365-3040
DOI:10.1111/pce.14444