Dryadomyces amasae:: a nutritional fungus associated with ambrosia beetles of the genus Amasa (Coleoptera: Curculionidae, Scolytinae)
Dryadomyces amasae:: a nutritional fungus associated with ambrosia beetles of the genus Amasa (Coleoptera: Curculionidae, Scolytinae)
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DOI：
10.1017/s0953756205002777
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发表时间：
2005-06-01
影响因子：
--
通讯作者：
Oberwinkler, F
中科院分区：
文献类型：
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作者：
Gebhardt, H;Weiss, M;Oberwinkler, F
在对台湾林地进行调查时，发现了一种以前未描述过的真菌 Dryadomyces amasae gen。 sp。 11 月，在小蠹甲虫 Amasa concitatus 的廊道系统的死亡被子植物木材的边材中发现。这种真菌主要生长在取食甲虫幼虫的附近，作为营养性豚草真菌。 D. amasae 向新的繁殖基质的传播是通过口腔菌囊来确保的，口腔菌囊是在 A. concitatus 和 A. aff 中发现的配对器官。下颌骨附近的光滑区域含有多个真菌细胞。从形态上看，D. amasae 类似于 Ambrosiella 的物种。然而，基于部分nucSSU rDNA的系统发育分析将该真菌与伞形菌属的某些物种归入蛇口目，而伞形菌的模式种A. xylebori则被归入微鳞纲。 A. xylebori、A. ferruginea 和 A. hartigii 表现出瓶瓶座分生孢子发育，导致对 Ambrosiella 属描述的修订。相比之下，Dryadomyces 表现出分生孢子发育，其通过顶端、合轴壁形成，具有带有分生孢子的突出小齿。其他先前描述的安布罗氏菌属物种表现出非花瓶分生孢子发生，但分生孢子梗上缺乏细齿。因此，它们的分类需要进一步修订。
During surveys of woodlands in Taiwan a previously undescribed fungus Dryadomyces amasae gen. sp. nov., was found in the sapwood of dead angiosperm timbers in the gallery systems of the scolytine ambrosia beetle Amasa concitatus. The fungus grows predominantly in the immediate vicinity of the feeding beetle larvae and serves as a nutritional ambrosia fungus. The transmission of D. amasae to new breeding substrates is ensured by an oral mycetangium, a paired organ which was found in A. concitatus and A. aff. glaber near the mandibles and contained multiple cells of the fungus. Morphologically D. amasae resembles species of Ambrosiella. However, phylogenetic analysis based on partial nucSSU rDNA placed the fungus with certain species of the genus Ambrosiella within the Ophiostomatales, whereas the type species of Ambrosiella, A. xylebori, was assigned to the Microascales. A. xylebori, as well as A. ferruginea and A. hartigii, demonstrated phialidic conidial development, leading to an emendation of the description of the genus Ambrosiella. In contrast, Dryadomyces exhibited conidial development by apical, sympodial wall formation with prominent denticles bearing conidia. Other, previously described Ambrosiella species exhibited non-phialidic conidiogenesis, but lacked denticles on the conidiophores. Consequently, their classification needs further revision.