Browsing by Subject "Molecular systematics"

Now showing 1 - 4 of 4
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    A molecular approach to the phylogeny of the moss genus Pseudocrossidium (Pottiaceae, Bryopsida) and its taxonomic implications
    (Wiley, 2022-08-12) Cano Bernabé, María Jesús; Gallego Morales, María Teresa; Guerra Montes, Juan; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Pseudocrossidium is a genus of 21 species belonging to the Pottiaceae with the highest concentration of taxa and morphological variation found in South America. To investigate the evolutionary relationships among the species of Pseudocrossidium and other members of the Pottioideae, molecular phylogenetic reconstructions, using the nuclear ITS1‐5.8S‐ITS2, and the plastid atpB‐rbcL, trnG, and trnL‐F, has been performed because this genus has only been partially tested using molecular markers. Bayesian and maximum likelihood topologies show that the genus, as presently circumscribed, is polyphyletic. Consequently, the circumscription of Pseudocrossidium is amended and numerous taxonomic changes resulting from the molecular, morphological, and nomenclatural studies are proposed. The phylogenetic and morphologically divergent Pseudocrossidium mendozense is renamed as Gertrudiella mendozensis. Pseudocrossidium linearifolium and P. porphyreoneurum are representatives of the new genera Barbulastrum and Helicobarbula, respectively. Pseudocrossidium carinatum and P. santiagense are accommodated in a new genus Austrobarbula. Aloinella, nested in a paraphyletic Pseudocrossidium, is maintained at generic rank, apparently derived from Pseudocrossidium. Barbula integrifolia, B. riograndensis, and Tortula jaffuelii are transferred to Pseudocrossidium. The remaining species of Pseudocrossidium are maintained in this genus, pending further studies. Conflicts of the trees observed could be evidence of interspecific or intergeneric gene flow in various lineages in the Pottioideae.
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    A multilocus phylogeny of the moss genus Didymodon and allied genera (Pottiaceae): generic delimitations and their implications for systematics
    (Wiley, 2022-03-21) Cano Bernabé, María Jesús; Guerra Montes, Juan; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Didymodon s.l. is one of the largest genera in the moss family Pottiaceae, with about 122 species distributed in all continents. This, together with its high degree of morphological variation, has made it one of the taxonomically most challenging genera of Pottiaceae. Circumscription of Didymodon s.l. has been, and still is, controversial. To date, the only molecular study that has investigated the delimitation of the genus has been far from comprehensive (35 samples from 27 species), limited in geographical scope (mainly restricted to Europe), and based exclusively on ITS sequences. To evaluate the circumscription of Didymodon s.l. and its relationships with the allied genera Andinella, Gertrudiella, and Tridontium, we conducted phylogenetic analyses of DNA sequences for three plastid markers (atpB–rbcL, trnG, and trnL‐F) and one nuclear locus (ITS) for 335 samples representing 86 species of Didymodon s.l. (ca. 70%), and all taxa of the genera Andinella, Gertrudiella, and Tridontium. Individual markers and concatenated matrices were analyzed using maximum likelihood and Bayesian approaches. Our results indicate that Didymodon s.l. is not monophyletic, because Andinella, Gertrudiella, and Tridontium species are nested within it. Species of these four genera can be divided into eight well‐supported and morphologically distinct genera: Didymodon s.s., Geheebia, Gertrudiella, Husnotiella, Trichostomopsis, Tridontium, Vinealobryum, and Zanderella. In correspondence with the results presented, 38 new combinations, 10 new synonyms, and a new name are provided for those taxa where required, and lectotypes are designated for 13 names. A diagnostic key to the eight recognized genera is provided.
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    Didymodon schensianus (Pottiaceae, Bryophyta), a new combination for a widespread, but overlooked taxon in East Asia
    (Taylor and Francis Group, 2024-06-11) Inoue, Yuya; Cano Bernabé, María Jesús; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Barbula schensiana, endemic to China is transferred to the genus Didymodon as D. schensianus. It is shown that B. schensiana and its variety longifolia has incorrectly been considered conspecific with Didymodon vinealis and D. constrictus, respectively. Examination of other type specimens from East Asia such as Didymodon guangdongensis, Barbula altipes, Barbula nipponica and B. nipponica var. gracilis revealed that are new synonyms of D. schensianus. The range of the species is extended to Japan, Taiwan and Philippines. The species is described, lectotypified, illustrated and its distribution is mapped. Its distinction from and relationships with, similar species are discussed.
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    Reappraisal of Barbula trifaria var. desertorum (J. Froehl.) S. Agnew (Pottiaceae, Bryophyta), based on morphological and molecular evidence
    (Borntraeger Science Publishers, 2022-01-04) Harald, Kürschner; Ronald, Porley; Cano Bernabé, María Jesús; Guerra Montes, Juan; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Barbula trifaria var. desertorum, known from SW Asia and southern Italy, has been considered a synonym of Didymodon luridus or a synonym of D. rigidulus. To elucidate its systematic position, we conducted phylogenetic analyses of nuclear ribosomal DNA internal transcribed spacer (ITS) and plastid (atpB-rbcL, trnL-F, and trnG) sequences. Based on our morphological and phylogenetic results Barbula trifaria var. desertorum is transferred to the genus Didymodon and recognized at species rank as D. desertorum. The range of this species is extended to most Mediterranean countries and the Canary Islands. The species is described and illustrated, its affinities are discussed and its geographical distribution is mapped.