HOS15 represses flowering by promoting GIGANTEA degradation in response to low temperature in Arabidopsis.

ABSTRACT: Flowering is the primary stage of the plant developmental transition and is tightly regulated by environmental factors such as light and temperature. However, the mechanisms by which temperature signals are integrated into the photoperiodic flowering pathway are still poorly understood. Here, we demonstrate that HOS15, which is known as a GI transcriptional repressor in the photoperiodic flowering pathway, controls flowering time in response to low ambient temperature. At 16°C, the hos15 mutant exhibits an early flowering phenotype, and HOS15 acts upstream of photoperiodic flowering genes (GI, CO, and FT). GI protein abundance is increased in the hos15 mutant and is insensitive to the proteasome inhibitor MG132. Furthermore, the hos15 mutant has a defect in low ambient temperature-mediated

SUBMITTER: Ahn G 

PROVIDER: S-EPMC10363504 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature