GLABRA2 Regulates Actin Bundling Protein VILLIN1 in Root Hair Growth in Response to Osmotic Stress

编号 040025205

推送时间 20200817

研究领域 森林培育 

年份 2020 

类型 期刊 

语种 英语

标题 GLABRA2 Regulates Actin Bundling Protein VILLIN1 in Root Hair Growth in Response to Osmotic Stress

来源期刊 Plant Physiology

期 第252期

发表时间 20200707

关键词 bundling actin filaments;  GL2;  osmotic stress;  root hair growth;  VLN1; 

摘要 Actin binding proteins and transcription factors are essential in regulating plant root hair growth in response to various environmental stresses;however, the interaction between these two factors in regulating root hair growth remains poorly understood. Apical and sub-apical thick actin bundles are necessary for terminating rapid elongation of root hair cells. Here, we show that Arabidopsis (Arabidopsis thaliana) actin-bundling protein Villin1 (VLN1) decorate filaments in shank, subapical, and apical hairs. vln1 mutants displayed significantly longer hairs with longer hair growing time and defects in the thick actin bundles and bundling activities in the subapical and apical regions, whereas seedlings overexpressing VLN1 showed different results. Genetic analysis showed that the transcription factor GLABRA2 (Gl2) played a similar regulatory role as VLN1 in hair growth and actin dynamics. Moreover, further analyses demonstrated that VLN1 overexpression suppresses the gl2 mutant phenotypes regarding hair growth and actin dynamics;GL2 directly recognises the promoter of VLN1 and positively regulates VLN1 expression in root hairs;and the GL2-mediated VLN1 pathway is involved in the root hair growth response to osmotic stress. Our results demonstrate that the GL2-mediated VLN1 pathway plays an important role in the root hair growth response to osmotic stress, and describe a transcriptional mechanism that regulates actin dynamics and thereby modulates cell tip growth in response to environmental signals.

服务人员 孙小满

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