CaWRKY27 Negatively Regulates H₂O₂-Mediated Thermotolerance in Pepper (Capsicum annuum).

ABSTRACT: Heat stress, an important and damaging abiotic stress, regulates numerous WRKY transcription factors, but their roles in heat stress responses remain largely unexplored. Here, we show that pepper (Capsicum annuum) CaWRKY27 negatively regulates basal thermotolerance mediated by H₂O₂ signaling. CaWRKY27 expression increased during heat stress and persisted during recovery. CaWRKY27 overexpression impaired basal thermotolerance in tobacco (Nicotiana tabacum) and Arabidopsis thaliana, CaWRKY27-overexpressing plants had a lower survival rate under heat stress, accompanied by decreased expression of multiple thermotolerance-associated genes. Accordingly, silencing of CaWRKY27 increased basal thermotolerance in pepper plants.

SUBMITTER: Dang F 

PROVIDER: S-EPMC6252359 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature