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KMID : 0380220070400061083
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Journal of Biochemistry and Molecular Biology
2007 Volume.40 No. 6 p.1083 ~ p.1089
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AtHAP3b Plays a Crucial Role in the Regulation of Flowering Time in Arabidopsis during Osmotic Stress
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Chen Nai-Zhi
Zhang Xiu-Qing
Wei Peng-Cheng
Chen Qi-Jun
Ren Fei
Chen Jia
Wang Xue-Chen
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Abstract
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The HAP complex has been found in many eukaryotic organisms. HAP recognizes the CCAAT box present in the promoters of 30% of all eukaryotic genes. The HAP complex consists of three subunits - HAP2, HAP3 and HAP5. In this paper, we report the biological function of the AtHAP3b gene that encodes one of the HAP3 subunits in Arabidopsis. Compared with wild-type plants, hap3b-1 and hap3b-2 mutants exhibited a delayed flowering time under long-day photoperiod conditions. Moreover, the transcription levels of FT were substantially lower in the mutants than in the wild-type plants. These results imply that AtHAP3b may function in the control of flowering time by regulating the expression of FT in Arabidopsis. In a subsequent study, AtHAP3b was found to be induced by osmotic stress. Under osmotic stress conditions, the ap3b-1 and hap3b-2 mutants flowered considerably later than the wild-type plants. These results suggest that the AtHAP3b gene plays more important roles in the control of lowering under osmotic stress in Arabidopsis.
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KEYWORD
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Arabidopsis, AtHAP3b, Flowering time, HAP complex, Osmotic stress
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