title: CONSTANS-LIKE 7 regulates branching and shade avoidance response in Arabidopsis.
abstract: Branching is an important trait of plant development regulated by environmental signals. Phytochromes in Arabidopsis mediate branching in response to the changes in the red light:far-red light ratio (R:FR), the mechanisms of which are still elusive. Here it is shown that overexpression of CONSTANS-LIKE 7 (COL7) results in an abundant branching phenotype which could be efficiently suppressed by shade or a simulated shade environment (low R:FR). Moreover, col7 mutants develop shorter hypocotyls and COL7 overexpression lines develop longer hypocotyls in comparison with the wild type in low R:FR, indicating that COL7 acts as an enhancer of the shade avoidance response. In shade or transient low R:FR, transcriptional and post-transcriptional expression levels of COL7 are up-regulated and positively associated with rapid mRNA accumulation of PHYTOCHROME INTERACTING FACTOR 3-LIKE 1 (PIL1), a marker gene of shade avoidance syndrome (SAS). Taken together, the results suggest a dual role for COL7 which promotes branching in high R:FR conditions but enhances SAS in low R:FR conditions.
authors: College of Life Sciences, Hunan University, Changsha, China.
authors: Honggui
authors: H
authors: Wang
authors: Zenglin
authors: Z
authors: Zhang
authors: Hongyu
authors: H
authors: Li
authors: Xiaoying
authors: X
authors: Zhao
authors: Xuanming
authors: X
authors: Liu
authors: Michael
authors: M
authors: Ortiz
authors: Chentao
authors: C
authors: Lin
authors: Bin
authors: B
authors: Liu
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development* / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D003116:Color; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D005819:Genetic Markers; D018546:Hypocotyl / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects; D008027:Light; D010641:Phenotype; D011499:Protein Processing, Post-Translational; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D014170:Transformation, Genetic
chemical_list: D029681:Arabidopsis Proteins; C092776:CONSTANS protein, Arabidopsis; D004268:DNA-Binding Proteins; D005819:Genetic Markers; C456844:PIL1 protein, Arabidopsis; D012333:RNA, Messenger; D018749:RNA, Plant; D014157:Transcription Factors