蛇喙日规壳属分子系统学研究

Molecular phylogeny of Ophiognomonia

摘要

蛇喙日规壳属 Ophiognomonia (Sacc.) Speg.主要包含叶栖腐生菌和病原菌，寄主多为乔灌木。基于多基因分子系统发育分析，结合寄主与地理分布特征，将该属划分为 8 个组:矮桤木蛇喙日规壳组 Section Alni-viridis、山边青蛇喙日规壳组 Section Gei-montani、群马蛇喙日规壳组 Section Gunmensis、细柱蛇喙日规壳组 Section Ischnostyla、黑柱蛇喙日规壳组 Section Melanostyla、小巨蛇喙日规壳组 Section Micromegala、蔷薇蛇喙日规壳组 Section Rosae 和硬毛蛇喙日规壳组 Section Setacea。此外，从板栗 Castanea mollissima Blume 和锥栗 C. henryi (Skan) Rehder & E. H. Wilson 的凋落叶片上分离获得菌株，经形态与分子鉴定为小林蛇喙日规壳 O. kobayashii D.M. Walker。该种为中国新记录种，板栗和锥栗为其新记录寄主。本研究还增补了该菌的无性型形态描述，进一步完善了其物种界定，厘清了该属的研究现状，为日规壳科的分类学及相关病害研究奠定理论基础。

Abstract

Ophiognomonia (Sacc.) Speg. mainly includes foliar saprobes and pathogens, and most species inhabit trees and shrubs. Based on multi-gene molecular phylogenetic analysis, combined with host and geographic distribution characteristics, this study divided the genus into eight sections: Section Alni-viridis, Section Gei-montani, Section Gunmensis, Section Ischnostyla, Section Melanostyla, Section Micromegala, Section Rosae, and Section Setacea. In addition, two strains of Ophiognomonia were isolated from the fallen leaves of Castanea mollissima Blume and C. henryi (Skan) Rehder & E. H. Wilson, and were identified by morphological and molecular analyses. These strains were identified as O. kobayashii D.M. Walker. This species represents a new record in China, and C. mollissima and C. henryi are new host records for this fungus. This study also supplemented the anamorphic morphological description of this species, further improving its species delimitation. This study clarifies the current research status of the genus and lays a theoretical foundation for the taxonomy of Gnomoniaceae and related plant disease research.

关键词

间座壳目 / 日规壳科 / 分类 / 鉴定

Key words

Diaporthales / Gnomoniaceae / taxonomy / identification

参考文献

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基金资助

国家自然科学基金项目(32501665)

中央级公益性科研院所基本科研业务费专项资金(CAFYBB2023MA012)