Department of Botany, Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1760, 370 05 České Budějovice, Czech Republic.
Department of Plant Biology, Institute of Environmental Biology, Wrocław University of Environmental and Life Sciences, ul. Kożuchowska 7a, 51-631 Wrocław, Poland.
Mol Phylogenet Evol. 2022 Dec;177:107588. doi: 10.1016/j.ympev.2022.107588. Epub 2022 Jul 27.
Juncaceae is a cosmopolitan family belonging to the cyperid clade of Poales together with Cyperaceae and Thurniaceae. These families have global economic and ethnobotanical significance and are often keystone species in wetlands around the world, with a widespread cosmopolitan distribution in temperate and arctic regions in both hemispheres. Currently, Juncaceae comprises more than 474 species in eight genera: Distichia, Juncus, Luzula, Marsippospermum, Oreojuncus, Oxychloë, Patosia and Rostkovia. The phylogeny of cyperids has not been studied before in a complex view based on most sequenced species from all three families. In this study, most sequenced regions from chloroplast (rbcL, trnL, trnL-trnF) and nuclear (ITS1-5.8S-ITS2) genomes were employed from more than a thousand species of cyperids covering all infrageneric groups from their entire distributional range. We analyzed them by maximum parsimony, maximum likelihood, and Bayesian inference to revise the phylogenetic relationships in Juncaceae and Cyperaceae. Our major results include the delimitation of the most problematic paraphyletic genus Juncus, in which six new genera are recognized and proposed to recover monophyly in this group: Juncus, Verojuncus, gen. nov., Juncinella, gen. et stat. nov., Alpinojuncus, gen. nov., Australojuncus, gen. nov., Boreojuncus, gen. nov. and Agathryon, gen. et stat. nov. For these genera, a new category, Juncus supragen. et stat. nov., was established. This new classification places most groups recognized within the formal Juncus clade into natural genera that are supported by morphological characters.
灯心草科是一个世界性的科，属于莎草目莎草科、藨草科和谷精草科的莎草分支。这些科在全球范围内具有重要的经济和民族植物学意义，通常是世界各地湿地的关键物种，在南半球和北半球的温带和北极地区广泛分布。目前，灯心草科由 8 个属的 474 多种组成：Distichia、Juncus、Luzula、Marsippospermum、Oreojuncus、Oxychloë、Patosia 和 Rostkovia。以前从未在基于这三个科的所有测序物种的复杂观点下研究过莎草科的系统发育。在这项研究中，从叶绿体（rbcL、trnL、trnL-trnF）和核（ITS1-5.8S-ITS2）基因组中使用了来自一千多种莎草科植物的大多数测序区域，涵盖了它们整个分布范围的所有种下类群。我们通过最大简约法、最大似然法和贝叶斯推断来分析它们，以修正灯心草科和莎草科的系统发育关系。我们的主要结果包括界定最具问题的并系属 Juncus，其中识别并提出了六个新属来恢复该组的单系性：Juncus、Verojuncus、gen. nov.、Juncinella、gen. et stat. nov.、Alpinojuncus、gen. nov.、Australojuncus、gen. nov.、Boreojuncus、gen. nov. 和 Agathryon、gen. et stat. nov.。对于这些属，建立了一个新的类别，Juncus supragen. et stat. nov.。这种新的分类将正式 Juncus 分支内识别的大多数类群置于由形态特征支持的自然属中。
