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Arabinose biosynthesis is critical for salt stress tolerance in Arabidopsis

文献类型： 外文期刊

作者： Zhao, Chunzhao 1 ; Zayed, Omar 2 ; Zeng, Fansuo 3 ; Liu, Chaoxian 4 ; Zhang, Ling 5 ; Zhu, Peipei 6 ; Hsu, Chuan-Chih; 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Ctr Plant Stress Biol, CAS Ctr Excellence Mol Plant Sci, Shanghai 201602, Peoples R China

2.Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA

3.Northeast Forestry Univ, State Key Lab Tree Genet & Breeding, Harbin 150040, Heilongjiang, Peoples R China

4.Southwest Univ, Maize Res Inst, Chongqing 400715, Peoples R China

5.Jilin Acad Agr Sci, Jilin Prov Key Lab Agr Biotechnol, Changchun 130033, Jilin, Peoples R China

6.Purdue Univ, Dept Biochem, W Lafayette, IN 47907 USA

7.Ordu Univ, Dept Food Engn, TR-52200 Ordu, Turkey

8.Purdue Univ, Dept Bot & Plant Pathol, W Lafayette, IN 47907 USA

9.Purdue Univ, Purdue Ctr Plant Biol, W Lafayette, IN 47907 USA

关键词： Arabidopsis; arabinogalactan protein; arabinose; cell wall integrity; root elongation; salt stress

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN： 0028-646X

年卷期： 2019 年 224 卷 1 期

页码：

收录情况： SCI

摘要： The capability to maintain cell wall integrity is critical for plants to adapt to unfavourable conditions. l-Arabinose (Ara) is a constituent of several cell wall polysaccharides and many cell wall-localised glycoproteins, but so far the contribution of Ara metabolism to abiotic stress tolerance is still poorly understood. Here, we report that mutations in the MUR4 (also known as HSR8) gene, which is required for the biosynthesis of UDP-Arap in Arabidopsis, led to reduced root elongation under high concentrations of NaCl, KCl, NaNO3, or KNO3. The short root phenotype of the mur4/hsr8 mutants under high salinity is rescued by exogenous Ara or gum arabic, a commercial product of arabinogalactan proteins (AGPs) from Acacia senegal. Mutation of the MUR4 gene led to abnormal cell-cell adhesion under salt stress. MUR4 forms either a homodimer or heterodimers with its isoforms. Analysis of the higher order mutants of MUR4 with its three paralogues, MURL, DUR, MEE25, reveals that the paralogues of MUR4 also contribute to the biosynthesis of UDP-Ara and are critical for root elongation. Taken together, our work revealed the importance of the Ara metabolism in salt stress tolerance and also provides new insights into the enzymes involved in the UDP-Ara biosynthesis in plants.

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