Bambusicolous <i>Fomitiporia</i> revisited: multilocus phylogeny reveals a clade of host-exclusive species

is a genus of wood-inhabiting Hymenochaetaceae (Agaricomycetes) that includes pathogens and decomposers occurring on a wide array of plant substrates. Some species decay culms of woody bamboos, a poorly known biotic interaction. Four bambusicolous species of <i>Fomitiporia</i> are currently known. However, no studies concerning their phylogenetic relationships have been performed. In order to assess species boundaries and their relationships to each other, we conducted molecular phylogenetic analyses of nuc rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS) and portions of nuc 28S rDNA (28S), RNA polymerase II second largest subunit (<i>RPB2</i>), and translation elongation factor 1-α (<i>TEF1</i>), as well as morphological analyses. Four species that occur on culms of woody bamboos, <i>F. bambusarum, F. spinescens, F. uncinata</i>, and the new species <i>F. bambusipileata</i>, grouped together in an exclusive clade within a primarily Neotropical lineage. The new species differs from all other species in the group by the pileate basidiomata. Hypotheses regarding host-exclusivity are discussed.

该类群为栖木生锈革孔菌科（Hymenochaetaceae，伞菌纲Agaricomycetes）下的一属，包含广泛寄生于多种植物基质的病原菌与分解者。部分物种可降解木质竹类的秆茎，这是一类研究程度较低的生物互作关系。目前已知4种竹生木层孔菌属（Fomitiporia）物种，但尚无针对其系统发育关系的研究。为明确该类群的物种界定及其相互间的演化关系，我们对核核糖体DNA内转录间隔区ITS1-5.8S-ITS2（ITS）、核28S核糖体DNA（28S）片段、RNA聚合酶II第二大亚基（RPB2）以及翻译延伸因子1-α（TEF1）开展了分子系统发育分析，并辅以形态学研究。结果显示，4种生于木质竹秆茎的类群——*F. bambusarum*、*F. spinescens*、*F. uncinata*以及新种*F. bambusipileata*，在以新热带类群为主的支系中形成了一个独占性演化支。该新种以其具盖的担子果与该类群其余物种相区分。本文还讨论了关于宿主专一性的相关假说。

搜集汇总

背景与挑战

背景概述

该数据集支持一项关于Fomitiporia属真菌的研究，聚焦于四种在竹子上生长的物种，包括一个新物种F. bambusipileata。通过多基因座系统发育和形态学分析，数据揭示了这些物种形成一个独特的进化枝，表明它们可能具有宿主专一性。数据集包含补充表格和图表，用于展示分子和形态比较结果，为真菌分类学和生态学提供关键证据。