浙江省农业科学院机构知识库

Rapid auxin-mediated changes in the proteome of the epidermal cells in rye coleoptiles: implications for the initiation of growth

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文献类型：外文期刊

作者： Deng, Z. ¹ ; Xu, S. ¹ ; Chalkley, R. J. ³ ; Oses-Prieto, J. A. ³ ; Burlingame, A. L. ³ ; Wang, Z. -Y. ¹ ; Kutschera, U ¹ ;

作者机构： 1.Carnegie Inst Sci, Dept Plant Biol, Stanford, CA USA

2.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Breeding Base Zhejiang Pest & Dis C, Hangzhou, Zhejiang, Peoples R China

3.Univ Calif San Francisco, Dept Pharmaceut Chem, San Francisco, CA USA

关键词： Auxin;cell elongation;cell wall;epidermis;Golgi secretion;proteomics

期刊名称：PLANT BIOLOGY （影响因子：3.081；五年影响因子：2.972 ）

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收录情况： SCI

摘要： In axial organs of juvenile plants, the phytohormone auxin (indole-3-acetic acid, IAA) rapidly mediates cell wall loosening and hence promotes turgor-driven elongation. In this study, we used rye (Secale cereale) coleoptile sections to investigate possible effects of IAA on the proteome of the cells. In a first set of experiments, we document that IAA causes organ elongation via promotion of expansion of the rigid outer wall of the outer epidermis. A quantitative comparison of the proteome (membrane-associated proteins), using two-dimensional difference gel electrophoresis (2-D DIGE), revealed that, within 2 h of auxin treatment, at least 16 protein spots were up- or down-regulated by IAA. These proteins were identified using reverse-phase liquid chromatography electrospray tandem mass spectrometry. Four of these proteins were detected in the growth-controlling outer epidermis and were further analysed. One epidermal polypeptide, a small Ras-related GTP-binding protein, was rapidly down-regulated by IAA (after 0.5 h of incubation) by )35% compared to the control. Concomitantly, a subunit of the 26S proteasome was up-regulated by IAA (+30% within 1 h). In addition, this protein displayed IAAmediated post-translational modification. The implications of these rapid auxin effects with respect to signal transduction and IAA-mediated secretion of glycoproteins (osmiophilic nano-particles) into the growth-controlling outer epidermal wall are discussed.

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Rapid auxin-mediated changes in the proteome of the epidermal cells in rye coleoptiles: implications for the initiation of growth

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Rapid auxin-mediated changes in the proteome of the epidermal cells in rye coleoptiles: implications for the initiation of growth

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