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Cold‐regulated gene expression and freezing tolerance in an Arabidopsis thaliana mutant
Author(s) -
Lee Hojoung,
Xiong Liming,
Ishitani Manabu,
Stevenson Becky,
Zhu JianKang
Publication year - 1999
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1999.00375.x
Subject(s) - mutant , arabidopsis , vernalization , arabidopsis thaliana , biology , gene , genetics , locus (genetics) , gene expression , microbiology and biotechnology , wild type , mutation , freezing tolerance
Low temperature is an important environmental factor influencing plant growth and development. In this study, we report the characterization of a genetic locus,HOS2, which is defined by threeArabidopsis thalianamutants. Thehos2–1,hos2–2andhos2–3mutations result in enhanced expression ofRD29Aand other stress genes under low temperature treatment. Gene expression in response to osmotic stress or ABA is not affected in thehos2mutants. Genetic analysis indicates that thehos2mutations are recessive and in a nuclear gene. Compared with the wild‐type plants, thehos2–1mutant plants are less capable of developing freezing tolerance when treated with low non‐freezing temperatures. However, thehos2–1mutation does not impair the vernalization response. These results indicate thatHOS2is a negative regulator of low temperature signal transduction important for plant cold acclimation.