HOS10 encodes an R2R3-type MYB transcription factor essential for cold acclimation in plants.

ABSTRACT: We report the identification and characterization of an Arabidopsis mutant, hos10-1 (for high expression of osmotically responsive genes), in which the expression of RD29A and other stress-responsive genes is activated to higher levels or more rapidly activated than in wild-type by low temperature, exogenous abscisic acid (ABA), or salt stress (NaCl). The hos10-1 plants are extremely sensitive to freezing temperatures, completely unable to acclimate to the cold, and are hypersensitive to NaCl. Induction of NCED3 (the gene that encodes the rate-limiting enzyme in ABA biosynthesis) by polyethylene glycol-mediated dehydration and ABA accumulation are reduced by this mutation. Detached shoots from the mutant plants display an increased transpiration rate compared with wild-type plants. The hos

SUBMITTER: Zhu J 

PROVIDER: S-EPMC1175003 | biostudies-literature | 2005 Jul

REPOSITORIES: biostudies-literature