Revision of the genus Thyronectria (Hypocreales) from China
Revision of the genus Thyronectria (Hypocreales) from China
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DOI：
10.3852/16-004
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发表时间：
2016-11
期刊：
影响因子：
2.8
通讯作者：
Z. Zeng;W. Zhuang
中科院分区：
文献类型：
--
作者：
Z. Zeng;W. Zhuang
摘要对来自中国不同地区的甲藻的最新标本和标本进行了研究。结合形态分析和分子数据分析，共鉴定出8个种。其中Thyronectria atrobrunnea、Thyronectria orientalis和Thyronectria sinensis为新种。Thyronectria atrobrunnea的特征是黑褐色的种皮干燥时变成杯状，8孢子ASCI含有椭圆形到宽纺锤形或近圆柱形的子囊孢子，在ASCI内萌芽形成菌状到近椭圆形的子囊孢子。通过寄主的表皮，覆盖着黄绿色皮屑的浸泡或半浸泡的子囊壁，椭圆形到近梭形、绒毛状的子囊孢子，可以很容易地识别出东方甲状腺吸虫。在松树上，中华绒毛虫的特征是单生的子囊很少聚集，8孢子ASCI产生近圆柱形到蠕虫状的多隔子囊孢子，形成杆状到尿囊状的子囊孢子，填充ASCI。对新种及其近缘种进行了比较，并讨论了它们之间的差异。百脉曲霉在中国中为首次报道。对以前记录的物种的名称更改进行了记录。根据28S、ITS、RPB1、TEF1和TUB2的系统发育分析提示，表型性状，即：子囊孢子、子囊孢子、周壁附属物和寄主专一性可能携带系统发育信息，正如以前的文章所讨论的那样。
Abstract Recent collections and herbarium specimens of Thyronectria from different regions in China were examined. Using combined analyses of morphology and molecular data, we recognized eight species. Among them, Thyronectria atrobrunnea, T. orientalis, and T. sinensis are described and illustrated as new species. Thyronectria atrobrunnea is characterized by blackish brown perithecia that become cupulate when dry, and 8-spored asci containing ellipsoidal to broadly fusiform or subcylindrical ascospores that bud to form bacillar to subellipsoidal ascoconidia within the asci. Thyronectria orientalis can be easily recognized by stromata that are erumpent through the epidermis of the host, immersed or semi-immersed perithecia covered with yellowish green scurf, and ellipsoidal to subfusiform, muriform ascospores. Thyronectria sinensis on Pinus features solitary ascomata that are rarely aggregated, and 8-spored asci giving rise to subcylindrical to vermiform, multiseptate ascospores that form bacillar to allantoid ascoconidia that fill the asci. The new species and their close relatives are compared and differences between them are discussed. Thyronectria strobi is reported for the first time in China. Name changes for the previously recorded species are noted. Phylogenetic analyses inferred from 28S, ITS, RPB1, TEF1, and TUB2 hint that phenotypic characters, viz. stromata, ascospores, appendage of perithecial wall, and host specificity may carry phylogenetic information as previous papers discussed.