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OsGLU3, a Putative Membrane-Bound Endo-1,4-Beta-Glucanase, Is Required for Root Cell Elongation and Division in Rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Zhang, Jin-Wei 1 ; Xu, Lei 1 ; Wu, Yun-Rong 1 ; Chen, Xin-Ai 1 ; Liu, Yu 1 ; Zhu, Shi-Hua 2 ; Ding, Wo-Na 2 ; Wu, Ping 1 ; Y 1 ;

作者机构： 1.Zhejiang Univ, Coll Life Sci, State Key Lab Plant Physiol & Biochem, Hangzhou 310058, Zhejiang, Peoples R China

2.Ningbo Univ, Coll Sci & Technol, Ningbo 315211, Zhejiang, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Breeding Base Zhejian

关键词： Abiotic/environmental stress;nutrition;cell expansion;root biology

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

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收录情况： SCI

摘要： Plant roots move through the soil by elongation. This is vital to their ability to anchor the plant and acquire water and minerals from the soil. In order to identify new genes involved in root elongation in rice, we screened an ethyl methane sulfonate (EMS)-mutagenized rice library, and isolated a short root mutant, Osglu3-1. The map-based cloning results showed that the mutant was due to a point mutation in OsGLU3, which encodes a putative membrane-bound endo-1,4-beta-glucanase. Osglu3-1 displayed less crystalline cellulose content in its root cell wall, shorter root cell length, and a slightly smaller root meristem as visualized by restricted expression of OsCYCB1,1:GUS. Exogenous application of glucose can suppress both the lower root cell wall cellulose content and short root phenotypes of Osglu3-1. Consistently, OsGLU3 is ubiquitously expressed in various tissues with strong expression in root tip, lateral root, and crown root primodia. The fully functional OsGLU3-GFP was detected in plasma membrane, and FM4-64-labeled compartments in the root meristem and elongation zones. We also found that phosphate starvation, an environmental stress, altered cell wall cellulose content to modulate root elongation in a OsGLU3-dependant way.

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