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

Zhu, J.H. and Verslues, P.E. and Zheng, X.W and Lee, B.H. and Zhan, X.Q. and Manabe, Y. and Sokolchik, I. and Zhu, Y.M. and Dong, C.H. and Zhu, J.K. and Hasegawa, P.M. and Bressan, R. (2005) HOS10 encodes an R2R3-type MYB transcription factor essential for cold acclimation in plants. Proceedings of the National Academy of Sciences of the United States of America, 102 (28). pp. 9966-9971.

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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.

Item Type: Article
Additional Information: SNNigams collection
Author Affiliation: Department of Horticulture, Purdue University, West Lafayette, IN 47907, USA.
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Mr T L Gautham
Date Deposited: 13 Jul 2013 13:50
Last Modified: 13 Jul 2013 13:50
Official URL: http://dx.doi.org/10.1073/pnas.0503960102
URI: http://eprints.icrisat.ac.in/id/eprint/11027

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