A petunia transcription factor, PhOBF1, regulates flower senescence by modulating gibberellin biosynthesis.

ABSTRACT: Flower senescence is commonly enhanced by the endogenous hormone ethylene and suppressed by the gibberellins (GAs) in plants. However, the detailed mechanisms for the antagonism of these hormones during flower senescence remain elusive. In this study, we characterized one up-regulated gene PhOBF1, belonging to the basic leucine zipper transcription factor family, in senescing petals of petunia (Petunia hybrida). Exogenous treatments with ethylene and GA₃ provoked a dramatic increase in PhOBF1 transcripts. Compared with wild-type plants, PhOBF1-RNAi transgenic petunia plants exhibited shortened flower longevity, while overexpression of PhOBF1 resulted in delayed flower senescence. Transcript abundances of two senescence-related genes P

SUBMITTER: Ji X 

PROVIDER: S-EPMC10541524 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature