BAK7 displays unequal genetic redundancy with BAK1 in brassinosteroid signaling and early senescence in arabidopsis

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• 作者：Yu Jeong Jeong (1) (3)
  Yun Shang (1)
  Beg Hab Kim (1)
  Sun Young Kim (1)
  Jae Hyo Song (2)
  June Seung Lee (3)
  Myeong Min Lee (2)
  Jianming Li (4)
  Kyoung Hee Nam (1)
  
• 关键词：BAK1 homologs ; brassinosteroids ; insensitive 1 (BRI1) ; BRI1 ; associated kinase 1 (BAK1) ; leucine rich ; repeat receptor ; like kinases (LRR ; RLKs)
• 刊名：Molecules and Cells
• 出版年：2010
• 出版时间：March 2010
• 年：2010
• 卷：29
• 期：3
• 页码：259-266
• 全文大小：1306KB
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• 作者单位：Yu Jeong Jeong (1) (3)
  Yun Shang (1)
  Beg Hab Kim (1)
  Sun Young Kim (1)
  Jae Hyo Song (2)
  June Seung Lee (3)
  Myeong Min Lee (2)
  Jianming Li (4)
  Kyoung Hee Nam (1)
  
  1. Division of Biological Science, Sookmyung Women鈥檚 University, Seoul, 140-742, Korea
  3. Department of Life Sciences, Ewha Womans University, Seoul, 120-750, Korea
  2. College of Life Science and Biotechnology, Yonsei University, Seoul, 120-749, Korea
  4. Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, USA
  
• ISSN：0219-1032

文摘

BRI1-Associated kinase1 (BAK1), a five leucine-rich-repeat containing receptor-like serine/threonine kinase, has been shown to have dual functions: mediating brassinosteroid (BR) signaling and acting in the BR-independent plant defense response. Sequence analysis has revealed that BAK1 has two homologs, BAK7 and BAK8. Because BAK8 deviates from the canonical RD kinase motif, we focused on the functional analysis of BAK7. The expression pattern and tissues in which BAK7 appeared partially overlapped with those observed for BAK1. Expression levels of BAK7 increased in the bak1 mutant. Overexpression of BAK7 rescued the bri1 mutant phenotype, indicating that BAK7 can compensate for BAK1 in BR-mediated processes, especially in the absence of BAK1. However, root and hypocotyl elongation patterns of transgenic plants overexpressing BAK1 or BAK7 appeared to be different from the patterns observed in a BRI1 overexpressor. Furthermore, the sensitivity of transgenic plants overexpressing BAK7 to brassinazole, a biosynthetic inhibitor of brassinolide (BL), did not change compared to that of wild-type plants. In addition, we generated transgenic plants expressing BAK7 RNA interference constructs and found severe growth retardation and early senescence in these lines. Taken together, these results suggest that BAK7 is a component of the BR signaling pathway, with varying degrees of genetic redundancy with BAK1, and that it affects plant growth via BL-independent pathways in vivo.