Insights into genes encoding respiratory burst oxidase homologs (RBOHs) in rubber tree (Hevea brasiliensis Muell. Arg.)

文献类型： 外文期刊

第一作者： Zou, Zhi

作者： Zou, Zhi;Yang, Jianghua;Zhang, Xicai

作者机构：

关键词： Hevea brasiliensis; Whole-genome duplication; Tapping panel dryness; Leaf senescence; Respiratory burst oxidase; Gene expression profiling

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.645； 五年影响因子：5.749 ）

ISSN： 0926-6690

年卷期： 2019 年 128 卷

页码：

收录情况： SCI

摘要： Superoxide-producing NADPH oxidases (NOXs), also known as respiratory burst oxidase homologs (RBOHs) in plants, are key players in the signaling network of reactive oxygen species (ROS) and involved in various plant processes. Despite the importance of RBOHs, little information is available in Hevea brasiliensis, a rubber-producing tree of the Euphorbiaceae family. This study presents the first genome-wide analysis of Rboh family genes in this special species. By using arabidopsis and rice RBOH proteins as queries, homology search of the rubber tree genome resulted in a relatively high number of ten Rboh genes. According to phylogenetic analysis, these genes were divided into seven groups named RBOHD, RBOHC, RBOHB, RBOHE, RBOHF, RBOHH, and RBOHN, which is consistent with best-reciprocal-hit-based sequence comparison with representative plant species. The former six groups are widely distributed in core eudicots, whereas RBOHN represents a novel but ancient group that has lost in many plants including poplar, grapevine, arabidopsis, and rice. Comparative genomics analysis showed that all rubber tree paralogs were derived from the recent whole-genome duplication (WGD) shared by cassava. Gene expression profiling revealed diverse patterns of different family members over various rubber tree tissues as observed in cassava, which also supports expression divergence between duplicates. Moreover, key members, which are related to tapping panel dryness, leaf senescence, hormone, and/or stress responses, were also identified in rubber tree. Results obtained from this study will facilitate further studies of Rboh genes in rubber tree as well as other species.

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