HOS10 encodes an R2R3-type MYB transcription factor essential for cold acclimation in plants.
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 hos10-1 plants exhibit several developmental alterations, such as reduced size, early flowering, and reduced fertility. The HOS10 gene encodes a putative R2R3-type MYB transcription factor that is localized to the nucleus. Together, these results indicate that HOS10 is an important coordinating factor for responses to abiotic stress and for growth and development.
Department of Horticulture, Purdue University, West Lafayette, IN 47907, USA.
Jianhua
J
Zhu
Paul E
PE
Verslues
Xianwu
X
Zheng
Byeong-ha
BH
Lee
Xiangqiang
X
Zhan
Yuzuki
Y
Manabe
Irina
I
Sokolchik
Yanmei
Y
Zhu
Chun-Hai
CH
Dong
Jian-Kang
JK
Zhu
Paul M
PM
Hasegawa
Ray A
RA
Bressan
D000040:Abscisic Acid / Q000494:pharmacology; D000064:Acclimatization / Q000502:physiology*; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology*; D001483:Base Sequence; D003001:Cloning, Molecular; D003080:Cold Temperature; D017931:DNA Primers; D049308:Dioxygenases; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics*; D005822:Genetic Vectors; D046228:Microarray Analysis; D008969:Molecular Sequence Data; D010105:Oxygenases / Q000378:metabolism; D010641:Phenotype; D010940:Plant Proteins; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride / Q000633:toxicity; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics*
D017931:DNA Primers; D010940:Plant Proteins; D014157:Transcription Factors; D012965:Sodium Chloride; D000040:Abscisic Acid; D010105:Oxygenases; D049308:Dioxygenases; C109043:9-cis-epoxy-carotenoid dioxygenase