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首页> 外文期刊>Mycologia >The phylogenetic position of Postia s.l. (Polyporales, Basidiomycota) from Patagonia, Argentina
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The phylogenetic position of Postia s.l. (Polyporales, Basidiomycota) from Patagonia, Argentina

机译：Postia s.l.的系统发育位置。 （Polyporales，Basidiomycota）来自阿根廷巴塔哥尼亚

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摘要

We investigated the phylogenetic relationships of Postia species from Patagonia with rDNA ITS and LSU sequences, together with morphological, cultural and biological features. All species in the genus were included in a "Postia clade" irrespective of whether their spores were thin- or thick-walled. This clade is characterized by tetrapolar mating, a normal nuclear behavior, metachromatic generative hyphae and absence of fiber hyphae in culture. One subclade merged the austral taxa P. pelliculosa and P. punctata, but otherwise no distinct relationships were found regarding spore shape, spore wall thickness and geographical distribution of taxa. The austral P. venata and the endemic P. carbophila, with thin-walled basidiospores, occupied variable positions in both analyses. Postia caesia from Patagonia grouped within the P. caesia species complex but on a separate branch. In contrast, P. rennyi and P. balsamea from Patagonia corresponded well with strains from other geographic areas. The two austral species in Ryvardenia, R. cretacea and R. campyla, characterized by non-metachromatic hyphae, bipolar mating and an astatocoenocytic nuclear behavior, formed an independent subclade among the dimitic genera of the "Antrodia clade", far from other Postia taxa within which they had been placed previously, supporting their inclusion in a genus of their own. Postia carbophila grouped with other Postia species and not with Postia (Rhodonia) placenta as suggested previously on the basis of morphological comparisons. Instead, the latter species grouped with taxa in the dimitic genus Amyloporia with which it shares heterocytic nuclear behavior. A separation between specimens of Postia pelliculosa and Ryvardenia cretacea from either side of the Pacific (i.e. SE Australia/New Zealand and S Argentina/S Chile) suggests they could be considered different at the species level from a phylogenetic point of view.
机译：我们调查了巴塔哥尼亚的Postia种与rDNA ITS和LSU序列的系统发育关系，以及形态，文化和生物学特征。不论孢子是薄壁还是厚壁，该属中的所有物种都包括在“ Postia进化枝”中。该进化枝的特征是四极交配，正常核行为，变色生成菌丝和培养物中无纤维菌丝。一个小分支合并了南方分类单元P. pelliculosa和P. punctata，但是在孢子形状，孢子壁厚和分类单元的地理分布方面没有发现明显的关系。在两个分析中，南美洲的P. venata和地方性的P. carbophila都有薄壁的孢子虫，占据了可变的位置。来自巴塔哥尼亚的Postes caesia聚集在P. caesia种复合体内，但在单独的分支上。相比之下，巴塔哥尼亚的P. rennyi和balsamea与来自其他地理区域的菌株非常吻合。 Ryvardenia的两个南方物种，R。cretacea和R. campyla，具有非变色菌丝，双极交配和无顺子囊核行为，在“ Antrodia进化枝”的二属中形成了一个独立的亚群，与其他Postia类群相距甚远。以前已将它们放置在其中，支持将它们包含在自己的属中。卡波菲亚波西米亚与其他波波亚种组合在一起，而不是先前根据形态学比较建议的波西尼亚（罗丹尼亚）胎盘。取而代之的是，后者的物种在与它共享异细胞核行为的双歧性淀粉状支原体属中归类。从太平洋两岸（即东南澳大利亚/新西兰和南阿根廷/智利智利）分离出的波黑Postia pelliculosa和Ryvardenia cretacea标本表明，从系统发育的角度看，它们在物种水平上可能是不同的。

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