The Seed Development Factors TT2 and MYB5 Regulate Heat Stress Response in Arabidopsis

Pierre Jacob, Gwilherm Brisou, Marion Dalmais, Johanne Thévenin, Froukje van der Wal, David Latrasse, Ravi Suresh Devani, Moussa Benhamed, Bertrand Dubreucq, Adnane Boualem, Loic Lepiniec, Richard G.H. Immink, Heribert Hirt, Abdelhafid Bendahmane*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

HEAT SHOCK FACTOR A2 (HSFA2) is a regulator of multiple environmental stress responses required for stress acclimation. We analyzed HSFA2 co-regulated genes and identified 43 genes strongly co-regulated with HSFA2 during multiple stresses. Motif enrichment analysis revealed an over-representation of the site II element (SIIE) in the promoters of these genes. In a yeast 1-hybrid screen with the SIIE, we identified the closely related R2R3-MYB transcription factors TT2 and MYB5. We found overexpression of MYB5 or TT2 rendered plants heat stress tolerant. In contrast, tt2, myb5, and tt2/myb5 loss of function mutants showed heat stress hypersensitivity. Transient expression assays confirmed that MYB5 and TT2 can regulate the HSFA2 promoter together with the other members of the MBW complex, TT8 and TRANSPARENT TESTA GLABRA 1 (TTG1)
and that the SIIE was involved in this regulation. Transcriptomic analysis revealed that TT2/MYB5 target promoters were enriched in SIIE. Overall, we report a new function of TT2 and MYB5 in stress resistance and a role in SIIE-mediated HSFA2 regulation.
Original languageEnglish
Article number746
Number of pages18
JournalGenes
Volume12
Issue number5
DOIs
Publication statusPublished - 15 May 2021

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