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Genetic identification of RGF1 receptors, RGF1 INSENSITIVE 1 to 5

Genetic identification of RGF1 receptors, RGF1 INSENSITIVE 1...

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2016年全国植物生物学大会

作者： Yang Ou Xiaoting Lu quaner zi Qingqing Xun Jingjie Zhang Yujun Wu Hongyong Shi Zhuoyun Wei Baolin Zhao Xiaoyue Zhang Kai He Xiaoping Gou Chuanyou Li Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou University State Key Laboratory of Plant Genomics National Centre for Plant Gene ResearchInstitute of Genetics and Developmental BiologyChinese Academy of Sciences

RGF1,a secreted peptide hormone,plays a key role in root meristem development in Arabidopsis. Previous studies indicated that a functional RGF1 needs to be sulfated at a tyrosine residue by a tyrosylprotein sulfotransferase(TPST) and that RGF1 regulates root meristem activity mainly via two downstream transcription factors,PLETHORA 1(PLT1) and PLT2. How extracellular RGF1 is perce ived by a plant cell,however,is not understood. Using genetic approaches,we discovered a clade of leucine-rich repeat receptor-like kinases(LRR-RLKs),designated as RGF1 INSENSITIVE 1(RGI1) to RGI5,serving as receptors of RGF1. Two independent rgi1 rgi2 rgi3 rgi4 rgi5 quintuple mutants display a consistent short primary root phenotype with a small size of meristem. An rgi1 rgi2 rgi3 rgi4 quadruple mutant shows a significantly reduced sensitivity and the quintuple mutant is completely insensitive to RGF1. The expression levels of PLT1 and PLT2 are almost undetectable in the quintuple mutant. Ectopic expression of PLT2 driven by an RGI2 promoter in the quintuple mutant greatly rescued its root meristem defects. One of the RGIs,RGI1,was subsequently analyzed biochemically in detail. In vitro dot-blotting and pull-down analysis indicated that RGI1 can physically interact with RGF1. Exogenous application of RGF1 can quickly and simultaneously induce the phosphorylation and ubiquitination of RGI1,indicating that RGI1 can perceive and transduce the RGF1 peptide signal. Yet,the activated RGI1 is likely turned over rapidly. These results demonstrated that RGIs,acting as the receptors of RGF1,play essential roles in RGF1-PLT-mediated root meristem development in Arabidopsis thaliana.

关键词： receptor-like kinase RGF1 RGF1 INSENSITIVE PLETHORA Arabidopsis

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