期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 64, 期 12, 页码 3911-3922出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ert223
关键词
Arabidopsis; auxin; hypocotyl elongation; MYBH; PIF; photomorphogenesis
资金
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries [2012-112068-3]
- Korea Research Foundation [2009-0065693]
- National Research Foundation of Korea [2009-0065693] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Critical responses to developmental or environmental stimuli are mediated by different transcription factors, including members of the ERF, bZIP, MYB, MYC, and WRKY families. Of these, MYB genes play roles in many developmental processes. The overexpression of one MYB gene, MYBH, significantly increased hypocotyl elongation in Arabidopsis thaliana plants grown in the light, and the expression of this gene increased markedly in the dark. The MYBH protein contains a conserved motif, R/KLFGV, which was implicated in transcriptional repression. Interestingly, the gibberellin biosynthesis inhibitor paclobutrazol blocked the increase in hypocotyl elongation in seedlings that overexpressed MYBH. Moreover, the function of MYBH was dependent on phytochrome-interacting factor (PIF) proteins. Taken together, these results suggest that hypocotyl elongation is regulated by a delicate and efficient mechanism in which MYBH expression is triggered by challenging environmental conditions such as darkness, leading to an increase in PIF accumulation and subsequent enhanced auxin biosynthesis. These results indicate that MYBH is one of the molecular components that regulate hypocotyl elongation in response to darkness.
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