Identification of Sieve Element Occlusion Gene (SEOs) Family in Rubber Trees (Hevea brasiliensis Muell. Arg.) Provides Insights to the Mechanism of Laticifer Plugging

文献类型： 外文期刊

第一作者： Wang, Xuan

作者： Wang, Xuan;Liu, Zifan;Wang, Xuan;Cheng, Linlin;Peng, Wentao;Xie, Guishui;An, Feng

作者机构：

关键词： rubber tree; sieve element occlusion; laticifer plugging; gene structure; gene expression

期刊名称：FORESTS （ 影响因子：3.282； 五年影响因子：3.292 ）

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年卷期： 2022 年 13 卷 3 期

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收录情况： SCI

摘要： P proteins encoded by SEOs (sieve element occlusion) have been shown to be associated with the blockage of sieve tubes after injury in many plants, but the presence of SEO genes and their association with rubber tree laticifer plugging and latex yield remain unclear. Through a systematic identification and analysis, seven SEO genes were identified from the rubber tree genome. The physicochemical properties of their proteins, gene structures, conserved domains, and locations on chromosomes were analyzed. According to their phylogenetic distance, HbSEOs were divided into two clusters. The transcript levels of HbSEO genes varied with tissues, in which HbSEO3 and HbSEO4 were most highly expressed in leaf, bark, and latex. HbSEOs could be induced by ethephon, methyl jasmonate, mechanical injury, and tapping; furthermore, they were highly expressed in trees with short flow duration, suggesting their possible association with rubber tree laticifer plugging and latex yield. To our knowledge, this is the first report of HbSEOs in rubber trees. It provides us with a better understanding of the mechanism of laticifer plugging.

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