한빛사 논문
Abstract
Eunjoo Seo1, Horim Lee 1, Jin Jeon 2, Hanna Park 1, Jungmook Kim 2, Yoo-Sun Noh 3, and Ilha Lee 4*
1 National Research Laboratory of Plant Developmental Genetics, School of Biological Sciences, Seoul National University, Seoul, 151-742, Korea
2 Department of Plant Biotechnology and Agricultural Plant Stress Research Center, Chonnam National University, Buk-Gu, Gwangju, 500-757, Korea
3 Global Research Laboratory for Flowering at Seoul National University and University of Wisconsin-Madison, Seoul 151-742, Korea
4 National Research Laboratory of Plant Developmental Genetics, School of Biological Sciences, Seoul National University, Seoul, 151-742, Korea; Global Research Laboratory for Flowering at Seoul National University and University of Wisconsin-Madison, Seoul 151-742, Korea; Plant Metabolism Research Center, Kyung Hee University, Suwon 449-701, Korea
* To whom correspondence should be addressed.
The appropriate timing of flowering is pivotal for reproductive success in plants; thus, it is not surprising that flowering is regulated by complex genetic networks that are fine-tuned by endogenous signals and environmental cues. The Arabidopsis thaliana flowering-time gene SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1) encodes a MADS box transcription factor and is one of the key floral activators integrating multiple floral inductive pathways, namely, long-day, vernalization, autonomous, and gibberellin-dependent pathways. To elucidate the downstream targets of SOC1, microarray analyses were performed. The analysis revealed that the soc1-2 knockout mutant has increased, and an SOC1 overexpression line has decreased, expression of cold response genes such as CBFs (for CRT/DRE binding factors) and COR (for cold regulated) genes, suggesting that SOC1 negatively regulates the expression of the cold response genes. By contrast, overexpression of cold-inducible CBFs caused late flowering through increased expression of FLOWERING LOCUS C (FLC), an upstream negative regulator of SOC1. Our results demonstrate the presence of a feedback loop between cold response and flowering-time regulation; this loop delays flowering through the increase of FLC when a cold spell is transient as in fall or early spring but suppresses the cold response when floral induction occurs through the repression of cold-inducible genes by SOC1.
논문정보
관련 링크
연구자 키워드
연구자 ID
관련분야 연구자보기
관련분야 논문보기
해당논문 저자보기