한빛사 논문
Abstract
Jihyun Moon 1,† , Sung-Suk Suh 1,† , Horim Lee 1,† , Kyu-Ri Choi 1 , Choo Bong Hong 1 , Nam-Chon Paek 2 , Sang-Gu Kim 1 and Ilha Lee 1,3,*
1 School of Biological Sciences, Seoul National University, Seoul 151-742, Korea, 2 School of Plant Science, Seoul National University, Suwon 441-744, Korea, and 3 Plant Metabolism Research Center, Kyung Hee University, Suwon 449-701, Korea
* For correspondence (fax +82 2 872 1993).
†These authors made equal contributions to this study.
KEYWORDS
flowering, MADS-box gene, SOC1, gibberellin, vernalization
ABSTRACT
The floral transition in Arabidopsis is regulated by at least four flowering pathways: the long-day, autonomous, vernalization, and gibberellin (GA)-dependent pathways. Previously, we reported that the MADS-box transcription factor SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1) integrates the long-day and vernalization/autonomous pathways. Here, we present evidences that SOC1 also integrates signaling from the GA-dependent pathway, a major flowering pathway under non-inductive short days. Under short days, the flowering time of GA-biosynthetic and -signaling mutants was well correlated with the level of SOC1 expression; overexpression of SOC1 rescued the non-flowering phenotype of ga1-3, and the soc1 null mutant showed reduced sensitivity to GA for flowering. In addition, we show that vernalization-induced repression of FLOWERING LOCUS C (FLC), an upstream negative regulator of SOC1, is not sufficient to activate SOC1; positive factors are also required. Under short days, the GA pathway provides a positive factor for SOC1 activation. In contrast to SOC1, the GA pathway does not regulate expression of other flowering integrators FLC and FT. Our results explain why the GA pathway has a strong effect on flowering under short days and how vernalization and GA interact at the molecular level.
Received 4 March 2003; revised 20 May 2003; accepted 5 June 2003.
DIGITAL OBJECT IDENTIFIER (DOI)
10.1046/j.1365-313X.2003.01833.x
논문정보
관련 링크
연구자 키워드
연구자 ID
관련분야 연구자보기
소속기관 논문보기
관련분야 논문보기
해당논문 저자보기