A comprehensive species sampling sheds light on the molecular phylogenetics of Calothecinae (Poaceae, Pooideae, Poeae): Evidence for a new subtribe and multiple genera within the Chascolytrum clade,Journal of Systematics and Evolution

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A comprehensive species sampling sheds light on the molecular phylogenetics of Calothecinae (Poaceae, Pooideae, Poeae): Evidence for a new subtribe and multiple genera within the Chascolytrum clade
Journal of Systematics and Evolution ( IF 3.4 ) Pub Date : 2021-04-07 , DOI: 10.1111/jse.12750
Leonardo N. Silva ₁ , Jeffery M. Saarela ₂ , Liliana Essi ₃ , Tatiana T. Souza‐Chies ₁

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The circumscription of the grass subtribe Calothecinae has undergone several changes since its description. Currently, it comprises Chascolytrum and the recently described genera Laegaardia and Paramochloa. Here we evaluate the circumscription of Calothecinae and the recently proposed infrageneric classification of Chascolytrum based on a phylogeny with more comprehensive taxon and molecular marker sampling than in previous studies. We sampled all Calothecinae genera, all but one Chascolytrum species, two South American Trisetum s.l., and representatives of the subtribes Agrostidinae, Brizinae, Echinopogoninae, Koeleriinae, Phalaridinae, and Torreyochloinae within Poaceae tribe Poeae. We performed Bayesian and Maximum Likelihood analyses of four plastid DNA regions (atpF-atpH, matK, rps16 intron, and trnL-trnF) and two nuclear ribosomal regions (ITS and ETS). Our results revealed that neither Calothecinae nor Chascolytrum is monophyletic, as currently recognized, because Trisetum brasiliense and Trisetum bulbosum are nested within Chascolytrum. We include these two Trisetum species in Calothecinae as incertae sedis. Laegaardia and Paramochloa form a clade that is sister to the Chascolytrum + Trisetum clade, and based on morphological characters, we transfer the former to the new subtribe Paramochloinae. Our Chascolytrum phylogeny is better resolved and supported than in previous studies, and based on these results, we divide Chascolytrum into nine genera, including two new ones: Boldrinia (gen. nov.), Calotheca, Chascolytrum, Erianthecium, Lombardochloa, Microbriza, Poidium, Rhombolytrum, and Rosengurttia (gen. nov.). We provide a key to Calothecinae genera, descriptions of the genera, nomenclatural information, and keys to species of each genus. In addition, six new combinations are proposed.

中文翻译：

全面的物种采样揭示了 Calothecinae（禾本科、Pooideae、Poeae）的分子系统发育学：Chascolytrum 进化枝内新亚族和多个属的证据

草亚部落 Calothecinae 的范围自描述以来经历了几次变化。目前，它包括Chascolytrum和最近描述的Laegaardia和Paramochloa属。在这里，我们评估了 Calothecinae 的范围和最近提出的 Chascolytrum 的下属分类，该分类基于比以前的研究更全面的分类和分子标记采样的系统发育。我们采样了所有 Calothecinae 属，除了一种Chascolytrum物种，两种南美Trisetum sl.，以及禾本科 Poaeae 中的 Agrostidinae、Brizinae、Echinopogoninae、Koeleriinae、Phalaridinae 和 Torreyochloinae 亚部落的代表。我们对四个质体 DNA 区域（ atpF-atpH、matK、rps16内含子和trnL-trnF）和两个核核糖体区域（ITS 和 ETS）进行了贝叶斯和最大似然分析。我们的研究结果表明，Calothecinae 和Chascolytrum 都不是单系的，正如目前公认的那样，因为Trisetum brasiliense和Trisetumbulbosum嵌套在Chascolytrum中。我们将这两种Trisetum物种包括在 Calothecinae 中作为incertae sedis. Laegaardia和Paramochloa形成一个进化枝，是Chascolytrum + Trisetum进化枝的姐妹，并且根据形态特征，我们将前者转移到新的 Paramochloinae 亚部落。我们的Chascolytrum系统发育比以前的研究得到了更好的解决和支持，并且基于这些结果，我们将Chascolytrum分为九个属，包括两个新属：Boldrinia (gen. nov.)、Calotheca、Chascolytrum、Erianthecium、Lombardochloa、Microbriza、Poidium ,菱鲆, 和Rosengurttia (gen. nov.)。我们提供了 Calothecinae 属的关键字、属的描述、命名信息以及每个属的物种的关键字。此外，还提出了六种新组合。

更新日期：2021-04-07

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