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The evolutionary history of the sucrose synthase gene family in higher plants

文献类型： 外文期刊

作者： Xu, Xiaoyang 1 ; Yang, Yongheng 1 ; Liu, Chunxiao 3 ; Sun, Yuming 1 ; Zhang, Ting 1 ; Hou, Menglan 1 ; Huang, Suzhen 1 ;

作者机构： 1.Inst Bot, Jiangsu Key Lab Res & Utilizat Plant Resources, Nanjing 210014, Jiangsu, Peoples R China

2.Chinese Acad Sci, Nanjing 210014, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Pomol, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China

关键词： Sucrose synthase; Gene family; Evolution; Phylogeny; Expression pattern

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2019 年 19 卷 1 期

页码：

收录情况： SCI

摘要： Background: Sucrose synthase (SUS) is widely considered a key enzyme participating in sucrose metabolism in higher plants and regarded as a biochemical marker for sink strength in crops. However, despite significant progress in characterizing the physiological functions of the SUS gene family, knowledge of the trajectory of evolutionary processes and significance of the family in higher plants remains incomplete. Results: In this study, we identified over 100 SUS genes in 19 plant species and reconstructed their phylogenies, presenting a potential framework of SUS gene family evolution in higher plants. Three anciently diverged SUS gene subfamilies (SUS I, II and III) were distinguished based on their phylogenetic relationships and unique intron/exon structures in angiosperms, and they were found to have evolved independently in monocots and dicots. Each subfamily of SUS genes exhibited distinct expression patterns in a wide range of plants, implying that their functional differentiation occurred before the divergence of monocots and dicots. Furthermore, SUS III genes evolved under relaxed purifying selection in dicots and displayed narrowed expression profiles. In addition, for all three subfamilies of SUS genes, the GT-B domain was more conserved than the "regulatory" domain. Conclusions: The present study reveals the evolution of the SUS gene family in higher plants and provides new insights into the evolutionary conservation and functional divergence of angiosperm SUS genes.

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