Guoli Deng, Songbei Ying, Sasa Jing, Jun Zhou, Shiyan Lu, Ping Li*
Phyton-International Journal of Experimental Botany, Vol.90, No.4, pp. 1089-1101, 2021, DOI:10.32604/phyton.2021.016217
Abstract Ambient temperature induces the hypocotyl elongation of seedling, called as thermomorphogenesis. It has been reported that the bHLH transcriptional factor PIF7 acts as the critical component to modulate plant thermomorphogenesis, but the underlying mechanism remains elusive. The phytohormone abscisic acid (ABA) suppresses the hypocotyl elongation under high temperature (HT) stress. As the ABI5 binding protein, AFP2 acts as the negative factor to control ABA signaling. In this study, we first identified AFP2 as the interaction protein of PIF7 in vitro and in vivo. Phenotype analysis revealed that overexpressing AFP2 reduced the hypocotyl elongation, while loss-of-function afp2 mutant showed longer hypocotyl… More >
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