数字农科院2.0

Characterization And Evolution Of Gene C.lusters For Terpenoid Phytoalexin B iosynthesis In Tobacco

文献类型： 外文期刊

作者： Fang, Dunhuang;Fan, Longjiang;Liu, Fangjie;Xiao, Bingguang;Qiu, Jie;Zhu, Qian:Hao;Timko, Michael Paul;Chen, Xi;Chen, Xi;Wang, Weidi;Zhang, Xingcheng;Liu, Fangjie;Liu, Fangjie;Ye, Chuyu;Fan, Longjiang;Liu, Lu;Chen, Xi;Ye, Chuyu;Wang, Weidi;Zhang, Xingcheng;Liu, Lu;Qiu, Jie;Fan, Longjiang

作者机构：

关键词： Capsidiol; Cytochrome P450; Genome-wide identification; Nicotiana tabacum; Terpene synthase; Transcriptome

期刊名称： PLANTA

ISSN： 0032-0935

年卷期： 2019 年 250 卷 5 期

页码：

摘要： Main conclusionThe study performed genome-wide identification, characterization and evolution analysis of gene clusters for phytoalexin terpenoid biosynthesis in tobacco, and specifically illustrated ones for capsidiol, an efficient defensive specialized metabolite.AbstractTerpenoid phytoalexins play an important role in plant self-defense against pest and pathogen attack. Terpenoid biosynthesis involves terpene synthase and cytochrome P450, which always locate and function as cluster(s). In this study, we performed genome-wide investigation of metabolic gene clusters involved in terpenoid production in tobacco (Nicotiana tabacum). Due to the complexity of the tobacco genome, we modified a published prediction pipeline to reduce the influence of the large number of repeats and to improve the annotation of tobacco genes with respect to their metabolic functions. We identified 1181 metabolic gene clusters with 34 of them potentially being involved in terpenoid biosynthesis. Through integration with transcriptome and metabolic pathway annotation analyses, 3 of the 34 terpenoid biosynthesis-related gene clusters were determined to be high-confidence ones, with 2 involved in biosynthesis of capsidiol, a terpenoid recognized as 1 of the effective resistance compounds in the Nicotiana species. The capsidiol-related gene cluster was conserved in N. sylvestris, N. tomentosiformis and N. attenuate. Our findings demonstrate that phytoalexins in tobacco can arise from operon-like gene clusters, a genomic pattern characterized as being beneficial for rapid stress response, gene co-regulation, co-function and co-heredity.

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