The SR Splicing Factors: Providing Perspectives on Their Evolution, Expression, Alternative Splicing, and Function in Populus trichocarpa
文献类型： 外文期刊
作者： Zhao, Xijuan 1 ; Tan, Lingling 1 ; Wang, Shuo 1 ; Shen, Yirong 1 ; Guo, Liangyu 1 ; Ye, Xiaoxue 2 ; Liu, Shenkui 1 ; Feng 1 ;
作者机构： 1.Zhejiang Agr & Forestry Univ, Sch Forestry & Biotechnol, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China
2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Nutr & Hlth SINH, Key Lab Nutr Metab & Food Safety, Shanghai 200032, Peoples R China
关键词： Populus trichocarpa; serine; arginine-rich (SR) protein; alternative splicing; abiotic stress; PtSCL30
期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.924； 五年影响因子：6.132 ）
ISSN：
年卷期： 2021 年 22 卷 21 期
页码：
收录情况： SCI
摘要： Serine/arginine-rich (SR) proteins are important splicing factors in plant development and abiotic/hormone-related stresses. However, evidence that SR proteins contribute to the process in woody plants has been lacking. Using phylogenetics, gene synteny, transgenic experiments, and RNA-seq analysis, we identified 24 PtSR genes and explored their evolution, expression, and function in Popolus trichocarpa. The PtSR genes were divided into six subfamilies, generated by at least two events of genome triplication and duplication. Notably, they were constitutively expressed in roots, stems, and leaves, demonstrating their fundamental role in P. trichocarpa. Additionally, most PtSR genes (~83%) responded to at least one stress (cold, drought, salt, SA, MeJA, or ABA), and, especially, cold stress induced a dramatic perturbation in the expression and/or alternative splicing (AS) of 18 PtSR genes (~75%). Evidentially, the overexpression of PtSCL30 in Arabidopsis decreased freezing tolerance, which probably resulted from AS changes of the genes (e.g., ICE2 and COR15A) critical for cold tolerance. Moreover, the transgenic plants were salt-hypersensitive at the germination stage. These indicate that PtSCL30 may act as a negative regulator under cold and salt stress. Altogether, this study sheds light on the evolution, expression, and AS of PtSR genes, and the functional mechanisms of PtSCL30 in woody plants.
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