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The SWEET gene family in Hevea brasiliensis - its evolution and expression compared with four other plant species

文献类型： 外文期刊

作者： Sui, Jin-Lei 1 ; Xiao, Xiao-Hu 2 ; Qi, Ji-Yan 2 ; Fang, Yong-Jun 2 ; Tang, Chao-Rong 2 ;

作者机构： 1.Hainan Univ, Inst Trop Agr & Forestry, Haikou, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Key Lab Rubber Biol, Minist Agr, Danzhou 571737, Hainan, Peoples R China

3.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou 571737, Hainan, Peoples R China

关键词： gene expression;Hevea brasiliensis;structure and evolution;sugar transport;SWEET

期刊名称：FEBS OPEN BIO （ 影响因子：2.693； 五年影响因子：2.519 ）

ISSN： 2211-5463

年卷期： 2017 年 7 卷 12 期

页码：

收录情况： SCI

摘要： SWEET proteins play an indispensable role as a sugar efflux transporter in plant development and stress responses. The SWEET genes have previously been characterized in several plants. Here, we present a comprehensive analysis of this gene family in the rubber tree, Hevea brasiliensis. There are 36 members of the SWEET gene family in this species, making it one of the largest families in plant genomes sequenced so far. Structure and phylogeny analyses of these genes in Hevea and in other species demonstrated broad evolutionary conservation. RNA-seq analyses revealed that SWEET2, 16, and 17 might represent the main evolutionary direction of SWEET genes in plants. Our results in Hevea suggested the involvement of HbSWEET1a, 2e, 2f, and 3b in phloem loading, HbSWEET10a and 16b in laticifer sugar transport, and HbSWEET9a in nectary-specific sugar transport. Parallel studies of RNA-seq analyses extended to three other plant species (Manihot esculenta, Populus trichocarpa, and Arabidopsis thaliana) produced findings which implicated MeSWEET10a, 3a, and 15b in M. esculenta storage root development, and the involvement of PtSWEET16b and PtSWEET16d in P. trichocarpa xylem development. RT-qPCR results further revealed that HbSWEET10a, 16b, and 1a play important roles in phloem sugar transport. The results from this study provide a foundation not only for further investigation into the functionality of the SWEET gene family in Hevea, especially in its sugar transport for latex production, but also for related studies of this gene family in the plant kingdom.

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