Corticimorbus sinomyrti gen. et sp nov (Cryphonectriaceae) pathogenic to native Rhodomyrtus tomentosa (Myrtaceae) in South China
Corticimorbus sinomyrti gen. et sp nov (Cryphonectriaceae) pathogenic to native Rhodomyrtus tomentosa (Myrtaceae) in South China
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中华皮质毛虫属
DOI：
10.1111/ppa.12507
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发表时间：
2016-10-01
期刊：
影响因子：
2.7
通讯作者：
Liu, F. F.
中科院分区：
文献类型：
--
作者：
Chen, S. F.;Wingfield, M. J.;Liu, F. F.
Cryphonectriaceae 包括许多重要的树木病原体，尤其是桃金娘科的病原体。对华南地区桃金娘科树木的病害调查显示，在广西省桉树种植园附近和香港地区的天然林区，原生的桃金娘（桃金娘科，Rhodomyrtus tomentosa）树木发生了茎腐病。在腐烂表面观察到具有典型 Cryphonectriaceae 特征的果实结构。根据 DNA 序列比较和形态特征对该真菌进行了鉴定，并在田间条件下对其在 R. tomentosa 上的致病性进行了测试。核糖体 DNA 部分大亚基、部分内部转录间隔和 b-tubulin 基因的两个区域的 DNA 序列比较显示，该真菌代表了 Cryphonectriaceae 中以前未曾描述过的属和种。从形态上看，该真菌与 Chrysoporthe 属的物种最为相似，但可以与该属和 Cryphonectriaceae 的其他属区分开来。该真菌被命名为 Corticimorbus sinomyrti gen.田间接种表明，它对 R. tomentosa 树具有很强的致病性，能在 4 周内杀死接种的树枝。致病性测试还表明，C. sinomyrti 对测试的桉树克隆具有致病性。对本地桉树和非本地桉树的致病性表明，应仔细监测这种真菌，以限制其向华南地区商业种植的桉树传播的可能性。
The Cryphonectriaceae includes many important tree pathogens, especially of the Myrtales. Disease surveys on Myrtales in South China revealed a stem canker disease on native Rhodomyrtus tomentosa (Myrtaceae, Myrtales) trees in the proximity of Eucalyptus plantations in GuangXi Province and in a natural forestry area in the Hong Kong Region. Fruiting structures with typical characteristics of the Cryphonectriaceae were observed on the canker surfaces. The fungus was identified based on DNA sequence comparisons and morphological features, and its pathogenicity was tested on R. tomentosa under field conditions. DNA sequence comparisons for the partial large subunit, partial internal transcribed spacer nuclear ribosomal DNA, and two regions of the b-tubulin gene showed that the fungus represents a previously undescribed genus and species in the Cryphonectriaceae. Based on morphology, the fungus is most similar to species in the genus Chrysoporthe, but can be distinguished from this and the other genera of Cryphonectriaceae. The fungus provided with the name Corticimorbus sinomyrti gen. et sp. nov., is described. Field inoculations showed that it is highly pathogenic to R. tomentosa trees, with the ability to kill inoculated branches within 4 weeks. Pathogenicity tests also showed that C. sinomyrti is pathogenic to a tested Eucalyptus clone. Pathogenicity on both native R. tomentosa and non-native Eucalyptus suggests that this fungus should be monitored carefully to limit its possible spread to commercially grown Eucalyptus in South China.