Insights into genes encoding respiratory burst oxidase homologs (RBOHs) in rubber tree (Hevea brasiliensis Muell. Arg.)
Insights into genes encoding respiratory burst oxidase homologs (RBOHs) in rubber tree (Hevea brasiliensis Muell. Arg.)
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深入了解橡胶树（Hevea brasiliensis Muell. Arg.）中编码呼吸爆发氧化酶同源物（RBOH）的基因
DOI：
10.1016/j.indcrop.2018.11.005
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发表时间：
2019-02
期刊：
影响因子：
--
通讯作者：
Zhang Xicai
中科院分区：
文献类型：
--
作者：
Zou Zhi;Yang Jianghua;Zhang Xicai
产生超氧化物的NADPH氧化酶（NOXs），也被称为植物中的呼吸爆发氧化酶同系物（RBOH），是活性氧（ROS）信号网络中的关键参与者，并参与各种植物过程。尽管RBOH的重要性，很少的信息是在橡胶树巴西，橡胶生产树的大戟科家庭。本研究首次对这一特殊物种的Rboh家族基因进行了全基因组分析。通过使用拟南芥和水稻RBOH蛋白作为查询，橡胶树基因组的同源性搜索导致相对较高数量的tenRbohgenes。系统发育分析结果表明，这些基因可分为RBOHD、RBOHC、RBOHB、RBOHE、RBOHF、RBOHH和RBOHN 7个类群，与典型植物的最佳互作序列比较结果一致。前六个类群广泛分布于核心真双子叶植物中，而RBOHN代表了一个新的但古老的类群，在包括白杨、葡萄藤、拟南芥和水稻在内的许多植物中已经消失。比较基因组学分析表明，所有的橡胶树旁系同源物都来自最近的木薯共享的全基因组重复（WGD）。基因表达谱显示不同的家庭成员在不同的橡胶树组织中观察到木薯，这也支持重复之间的表达分歧的不同模式。此外，还鉴定了橡胶树中与割胶板干燥、叶片衰老、激素和/或胁迫反应相关的关键成员。本研究结果为橡胶树及其它植物Rbohgenes的进一步研究奠定了基础。
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 inHevea brasiliensis, a rubber-producing tree of the Euphorbiaceae family. This study presents the first genome-wide analysis ofRbohfamily 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 tenRbohgenes. 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 ofRbohgenes in rubber tree as well as other species.
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