Arabidopsis Phytochrome B Promotes SPA1 Nuclear Accumulation to Repress Photomorphogenesis under Far-Red Light

doi:10.1105/tpc.112.107086

	Arabidopsis Phytochrome B Promotes SPA1 Nuclear Accumulation to Repress Photomorphogenesis under Far-Red Light
	Zheng, Xu 1,2; Wu, Suowei 1; Zhai, Huqu 1; Zhou, Peng 1; Song, Meifang 1; Su, Liang 1; Xi, Yulin 1,2; Li, Zhiyong 1; Cai, Yingfan 3; Meng, Fanhua 1
刊名	PLANT CELL
	2013
卷号	25 期号:1 页码:115-133
ISSN号	1040-4651
DOI	10.1105/tpc.112.107086
通讯作者	Zheng, Xu
英文摘要	Phytochrome A (phyA) is the primary photoreceptor mediating deetiolation under far-red (FR) light, whereas phyB predominantly regulates light responses in red light. SUPPRESSOR OF PHYA-105 (SPA1) forms an E3 ubiquitin ligase complex with CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1), which is responsible for the degradation of various photomorphogenesis-promoting factors, resulting in desensitization to light signaling. However, the role of phyB in FR light signaling and the regulatory pathway from light-activated phytochromes to the COP1-SPA1 complex are largely unknown. Here, we confirm that PHYB overexpression causes an etiolation response with reduced ELONGATED HYPOCOTYL5 (HY5) accumulation under FR light. Notably, phyB exerts its nuclear activities and promotes seedling etiolation in both the presence and absence of phyA in response to FR light. PhyB acts upstream of SPA1 and is functionally dependent on it in FR light signaling. PhyB interacts and forms a protein complex with SPA1, enhancing its nuclear accumulation under FR light. During the dark-to-FR transition, phyB is rapidly imported into the nucleus and facilitates nuclear SPA1 accumulation. These findings support the notion that phyB plays a role in repressing FR light signaling. Activity modulation of the COP1-SPA E3 complex by light-activated phytochromes is an effective and pivotal regulatory step in light signaling.
学科主题	Biochemistry & Molecular Biology ; Plant Sciences ; Cell Biology ; BIOCHEMISTRY & MOLECULAR BIOLOGY ; CELL BIOLOGY ; PLANT SCIENCES
语种	英语
出版者	AMER SOC PLANT BIOLOGISTS
WOS记录号	WOS:000315572400012
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/5095]
专题	作物科学研究所_遗传育种系
作者单位	1.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China 2.Chinese Acad Agr Sci, Grad Sch, Beijing 100081, Peoples R China 3.Chongqing Univ Posts & Telecommun, Coll Bioinformat, Chongqing 400065, Peoples R China 4.Capital Normal Univ, Coll Life Sci, Beijing 100048, Peoples R China 5.Yale Univ, Dept Mol Cellular & Dev Biol, New Haven, CT 06520 USA
推荐引用方式 GB/T 7714	Zheng, Xu,Wu, Suowei,Zhai, Huqu,et al. Arabidopsis Phytochrome B Promotes SPA1 Nuclear Accumulation to Repress Photomorphogenesis under Far-Red Light[J]. PLANT CELL,2013,25(1):115-133.
APA	Zheng, Xu.,Wu, Suowei.,Zhai, Huqu.,Zhou, Peng.,Song, Meifang.,...&Yang, Jianping.(2013).Arabidopsis Phytochrome B Promotes SPA1 Nuclear Accumulation to Repress Photomorphogenesis under Far-Red Light.PLANT CELL,25(1),115-133.
MLA	Zheng, Xu,et al."Arabidopsis Phytochrome B Promotes SPA1 Nuclear Accumulation to Repress Photomorphogenesis under Far-Red Light".PLANT CELL 25.1(2013):115-133.