Heteromeric HSFA2/HSFA3 complexes drive transcriptional memory after heat stress in Arabidopsis.

ABSTRACT: Adaptive plasticity in stress responses is a key element of plant survival strategies. For instance, moderate heat stress (HS) primes a plant to acquire thermotolerance, which allows subsequent survival of more severe HS conditions. Acquired thermotolerance is actively maintained over several days (HS memory) and involves the sustained induction of memory-related genes. Here we show that FORGETTER3/ HEAT SHOCK TRANSCRIPTION FACTOR A3 (FGT3/HSFA3) is specifically required for physiological HS memory and maintaining high memory-gene expression during the days following a HS exposure. HSFA3 mediates HS memory by direct transcriptional activation of memory-related genes after return to normal growth temperatures. HSFA3 binds HSFA2, and in vivo both proteins form heteromeric complexes with addi

SUBMITTER: Friedrich T 

PROVIDER: S-EPMC8187452 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature