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首页> 外文期刊>Mycologia >Revisiting the morphology and phylogeny of Lactifluus with three new lineages from southern China
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Revisiting the morphology and phylogeny of Lactifluus with three new lineages from southern China

机译：用来自中国南方的三个新世系重新研究乳杆菌的形态和系统发育

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As a recent group mainly defined by molecular data the genus Lactifluus is in need of further study to provide insight into the morphological and molecular variation within the genus, species limits and relationships. Phylogenetic analyses of nuc rDNA ITS1-5.8S-ITS2 (ITS), D1 and D2 domains of nuc 28S rDNA (28S), and part of the second largest subunit of the RNA polymerase II (rpb2) (6-7 region) sequences of 28 samples from southern China revealed three new lineages of Lactifluus. Two of them are nested in a major clade that includes the type of Lactifluus and here is treated as two new sections: L. sect. Ambicystidiati and L. sect. Tenuicystidiati. Lactifluus ambicystidiatus, described here as a new species (= sect. Ambicystidiati), has both lamprocystidia and macrocystidia in the hymenium, a unique combination of features within Russulaceae. Furthermore, only remnants of lactiferous hyphae are present in L. ambicystidiatus and our results suggest that the ability to form a lactiferous system has been lost in this lineage. Lactifluus sect. Tenuicystidiati forms a strongly supported monophyletic group as a sister lineage to L. sect. Lactifluus. We recognize it based on the thin-walled macrocystidia and smaller ellipsoid spores with an incomplete reticulum compared with L. sect. Lactifluus. The former placement of L. tenuicystidiatus in the African L. sect. Pseudogymnocarpi is not supported. Using genealogical concordance we recognize five phylogenetic species within L. sect. Tenuicystidiati and describe two of these as new, L. subpruinosus and L. tropicosinicus. The third lineage, represented by L. leoninus, forms a sister group to L. subg. Lactariopsis sensu stricto. The three lineages provide further evidence for morphological features in Lactifluus being homoplasious. Some sections and species complexes are likely to be composed of more species and merit further investigations. Subtropical-tropical Asia is likely a key region for additional sampling.
机译：作为主要由分子数据定义的新近群体，乳杆菌属需要进一步研究以提供对属内的形态和分子变异，种类限制和关系的深入了解。系统发育分析的nuc rDNA ITS1-5.8S-ITS2（ITS），nuc 28S rDNA（28S）的D1和D2结构域以及RNA聚合酶II（rpb2）（6-7区）序列的第二大亚基的一部分来自中国南方的28个样本揭示了三个新的乳杆菌谱系。它们中的两个嵌套在包括乳杆菌类型的主要进化枝中，在这里被视为两个新部分：L. sect。 Ambicystidiati和L。 Tenuicystidiati。 Lactifluus ambicystidiatus，在这里被描述为一个新物种（= Ambicystidiati属），其处女膜中同时具有脂囊藻和巨囊藻，这是俄罗斯菊科的独特特征。此外，仅在L. ambicystidiatus中存在乳杆菌菌丝的残留物，我们的结果表明在该谱系中已经丧失了形成乳杆菌系统的能力。乳杆菌属。 Tenuicystidiatiati形成了强烈支持的单系统群体，成为L.菌的姐妹谱系。乳杆菌我们认识到它是基于薄壁巨囊藻和较小的椭圆形孢子，与L. sect相比具有不完整的网状结构。乳杆菌tenuicystidiatus以前在非洲L.教派中的位置。不支持Pseudogymnocarpi。使用家谱一致性，我们可以识别出L.教派中的五个系统发育种。 Tenuicystidiati并将其中的两个描述为新的L. subpruinosus和L. tropicosinicus。第三条血统，由利奥氏乳杆菌（L. leoninus）代表，与苏氏乳杆菌（L. subg）形成一个姐妹群体。严格的乳杆菌。这三个谱系进一步证明了乳杆菌的形态特征是同质的。一些部分和物种复合体可能由更多物种组成，值得进一步研究。亚热带-亚洲可能是进行额外采样的关键区域。

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