Comparative Genomics Reveals Conserved Ophiobolin Biosynthetic Gene Cluster and Necrotrophic Adaptation in Bipolaris oryzae.

IF 2.5 3区 农林科学 Q2 PLANT SCIENCES
Yoeguang Hue, Yebin Nam, Byungheon Choi, Seoyeon Kim, Seol-Hwa Jang, Hyunjung Chung, Sook-Young Park, Ki-Tae Kim
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Abstract

Bipolaris oryzae, the causal agent of rice brown spot, is a necrotrophic fungus that produces phytotoxic secondary metabolites, yet its genomic basis of pathogenicity remains incompletely defined. We sequenced six South Korean B. oryzae isolates and analyzed them together with publicly available genomes from Bipolaris and related Pleosporaceae, covering 37 Bipolaris isolates across eight species. Phylogenomics based on singlecopy orthologs confirmed the monophyly of Bipolaris and resolved B. oryzae as a distinct lineage. Comparative analyses showed that B. oryzae has a moderately reduced secretome and fewer candidate pathogenicity gene families relative to B. maydis and B. sorokiniana, while retaining a conserved core enriched in carbohydrate and amino acid metabolism. We identified 48 secondary metabolite biosynthetic gene clusters in B. oryzae F1253 and, critically, localized the ophiobolin biosynthetic gene cluster to pseudochromosome 2. The cluster contains conserved core genes, oblA to oblD, which are broadly retained across Bipolaris, and exhibits interspecies variation in synteny and copy number associated with repeat element insertions. These findings reveal the genomic architecture underlying metabolic specialization and toxin biosynthesis in B. oryzae. They also provide actionable targets and markers for management, including diagnostics for oblA to oblD, screening of rice germplasm for ophiobolin tolerance, and RNAi-based suppression of ophiobolin biosynthesis under climate-related stress.

比较基因组学揭示水稻双极虫体内保守的蛇毒杆菌合成基因簇和坏死性适应。
水稻褐斑病的致病因子是一种产生植物毒性次生代谢物的坏死性真菌,但其致病性的基因组基础尚未完全确定。我们对6个韩国的b.r oryzae分离株进行了测序,并将它们与来自Bipolaris和相关多孢子科的公开基因组进行了分析,涵盖了8个物种的37个Bipolaris分离株。基于单拷贝同源物的系统基因组学证实了双极菌的单系性,并确定了米芽孢杆菌是一个独特的谱系。对比分析表明,与maydis和sorokiniana相比,b.m oryzae的分泌组适度减少,候选致病基因家族较少,但保留了一个富集碳水化合物和氨基酸代谢的保守核心。我们在b.m oryzae F1253中鉴定了48个次生代谢物生物合成基因簇,并将蛇血蛋白生物合成基因簇定位在假染色体2上。该集群包含保守的核心基因,从oba到oblD,这些基因在双极虫中广泛保留,并表现出与重复元件插入相关的同质性和拷贝数的种间差异。这些发现揭示了米芽孢杆菌代谢专门化和毒素生物合成的基因组结构。它们还为管理提供了可操作的靶点和标记,包括诊断oba到oblD,筛选水稻种质对蛇嗜血素的耐受性,以及在气候相关胁迫下基于rnai抑制蛇嗜血素的生物合成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Plant Pathology Journal
Plant Pathology Journal 生物-植物科学
CiteScore
4.90
自引率
4.30%
发文量
71
审稿时长
12 months
期刊介绍: Information not localized
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