An Arabidopsis homeodomain transcription factor gene, HOS9, mediates cold tolerance through a CBF-independent pathway.

ABSTRACT: To investigate essential components mediating stress signaling in plants, we initiated a large-scale stress response screen using Arabidopsis plants carrying the firefly luciferase reporter gene under the control of the stress-responsive RD29A promoter. Here we report the identification and characterization of a mutant, hos9-1 (for high expression of osmotically responsive genes), in which the reporter construct was hyperactivated by low temperature, but not by abscisic acid or salinity stress. The mutants grow more slowly, and flower later, than do wild-type plants and are more sensitive to freezing, both before and after acclimation, than the wild-type plants. The HOS9 gene encodes a putative homeodomain transcription factor that is localized to the nucleus. HOS9 is constitutively expres

SUBMITTER: Zhu J 

PROVIDER: S-EPMC470766 | biostudies-literature | 2004 Jun

REPOSITORIES: biostudies-literature