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Spliceosomal protein U1A is involved in alternative splicing and salt stress tolerance in Arabidopsis thaliana

文献类型： 外文期刊

作者： Gu, Jinbao 1 ; Xia, Zhiqiang 2 ; Luo, Yuehua 1 ; Jiang, Xingyu 1 ; Qian, Bilian 3 ; Xie, He 4 ; Zhu, Jian-Kang 5 ; Xiong, 1 ;

作者机构： 1.Hainan Univ, Inst Trop Agr & Forestry, Hainan Key Lab Sustainable Utilizat Trop Bioresou, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

3.Univ Maryland, Dept Plant Sci & Landscape Architecture, College Pk, MD 20742 USA

4.Yunnan Acad Tobacco Agr Sci, Tobacco Breeding & Biotechnol Res Ctr, Kunming 650021, Yunnan, Peoples R China

5.Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47906 USA

6.Chinese Acad Sci, Shanghai Inst Biol Sci, Shanghai Ctr Pl

期刊名称：NUCLEIC ACIDS RESEARCH （ 影响因子：16.971； 五年影响因子：15.542 ）

ISSN： 0305-1048

年卷期： 2018 年 46 卷 4 期

页码：

收录情况： SCI

摘要： Soil salinity is a significant threat to sustainable agricultural production worldwide. Plants must adjust their developmental and physiological processes to cope with salt stress. Although the capacity for adaptation ultimately depends on the genome, the exceptional versatility in gene regulation provided by the spliceosome-mediated alternative splicing (AS) is essential in these adaptive processes. However, the functions of the spliceosome in plant stress responses are poorly understood. Here, we report the in-depth characterization of a U1 spliceosomal protein, AtU1A, in controlling AS of pre-mRNAs under salt stress and salt stress tolerance in Arabidopsis thaliana. The atu1a mutant was hypersensitive to salt stress and accumulated more reactive oxygen species (ROS) than the wild-type under salt stress. RNA-seq analysis revealed that AtU1A regulates AS of many genes, presumably through modulating recognition of 5' splice sites. We showed that AtU1A is associated with the pre-mRNA of the ROS detoxification-related gene ACO1 and is necessary for the regulation of ACO1 AS. ACO1 is important for salt tolerance because ectopic expression of ACO1 in the atu1a mutant can partially rescue its salt hypersensitive phenotype. Our findings highlight the critical role of AtU1A as a regulator of pre-mRNA processing and salt tolerance in plants.

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