Baloch Elisabeth, Grube Martin
Institute of Plant Sciences, Karl-Franzens-University Graz, Holteigasse 6, A-8010 Graz, Austria.
Mycol Res. 2006 Feb;110(Pt 2):125-36. doi: 10.1016/j.mycres.2005.09.009. Epub 2005 Dec 22.
A phylogeny of the lichen family Porinaceae using mitochondrial SSU rDNA sequences is presented, with special focus on foliicolous taxa. Fifty specimens of 28 mostly tropical species, representing eight species groups of Porina as well as the genus Trichothelium, were analysed together with species of other members of Ostropomycetidae, and using Agyriaceae as outgroup. We performed the phylogenetic analyses with a Bayesian approach and under the criterion of maximum parsimony. Four main clades can be distinguished: the P. nitidula-group s. lat. (including Trichothelium, P. papillifera and P. rubescens), the Porina epiphylla-group s. lat. (including the P. radiata-, the P. nucula-, the P. imitatrix- and the P. epiphylla-group s. str.) and two clades of the P. rufula-group. The genus Porina as understood by all recent concepts is paraphyletic, and Trichothelium is nested within the Porina nitidula-group. The non-setose P. repanda forms a monophyletic clade with Trichothelium. The tree does not support a monophyletic origin of substrate preferences or photobiont selection. Species-specific associations with morphologically different trentepohlioid photobionts mapped on the tree suggest that closely related mycobiont species switch between different types of algae.
本文呈现了基于线粒体小亚基核糖体DNA序列构建的地衣类盘菌科系统发育树，特别关注叶生类群。分析了代表盘菌属8个物种组以及毛盘菌属的28个主要为热带物种的50个标本，这些标本与刺盾炱科的其他成员物种一起，以外类群银耳目科作为参照。我们采用贝叶斯方法并在最大简约标准下进行了系统发育分析。可区分出四个主要分支：广义的亮叶盘菌组（包括毛盘菌属、瘤状盘菌和红盘菌）、广义的叶生盘菌组（包括辐射盘菌组、核状盘菌组、拟盘菌组和狭义的叶生盘菌组）以及红褐盘菌组的两个分支。所有现代概念所理解的盘菌属是并系的，毛盘菌属嵌套在亮叶盘菌组内。无毛的展盘菌与毛盘菌属形成一个单系分支。该树状图不支持基质偏好或共生藻选择的单系起源。在树上绘制的与形态不同的橘色藻共生藻的物种特异性关联表明，亲缘关系相近的真菌共生体物种在不同类型的藻类之间转换。
