The plant stress hormone ethylene controls floral transition via DELLA-dependent regulation of floral meristem-identity genes.

ABSTRACT: The length of the Arabidopsis thaliana life cycle depends on the timing of the floral transition. Here, we define the relationship between the plant stress hormone ethylene and the timing of floral initiation. Ethylene signaling is activated by diverse environmental stresses, but it was not previously clear how ethylene regulates flowering. First, we show that ethylene delays flowering in Arabidopsis, and that this delay is partly rescued by loss-of-function mutations in genes encoding the DELLAs, a family of nuclear gibberellin (GA)-regulated growth-repressing proteins. This finding suggests that ethylene may act in part by modulating DELLA activity. We also show that activated ethylene signaling reduces bioactive GA levels, thus enhancing the accumulation of DELLAs. Next, we show that et

SUBMITTER: Achard P 

PROVIDER: S-EPMC1851083 | biostudies-literature | 2007 Apr

REPOSITORIES: biostudies-literature