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Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales
Abstract. The basal position of the small American genus Microtea within the core Caryophyllales was suggested only recently in accordance with molecular phylogeny. However, the specific relationships within the genus were not traced. The results of our phylogenetic analysis based on the matK chloro...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Pensoft Publishers
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6335385/ https://www.ncbi.nlm.nih.gov/pubmed/30655713 http://dx.doi.org/10.3897/phytokeys.115.29041 |
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author | Sukhorukov, Alexander P. Sennikov, Alexander N. Nilova, Maya V. Mazei, Yuri Kushunina, Maria Marchioretto, Maria Salete Hanáček, Pavel |
author_facet | Sukhorukov, Alexander P. Sennikov, Alexander N. Nilova, Maya V. Mazei, Yuri Kushunina, Maria Marchioretto, Maria Salete Hanáček, Pavel |
author_sort | Sukhorukov, Alexander P. |
collection | PubMed |
description | Abstract. The basal position of the small American genus Microtea within the core Caryophyllales was suggested only recently in accordance with molecular phylogeny. However, the specific relationships within the genus were not traced. The results of our phylogenetic analysis based on the matK chloroplast gene suggest the monophyly of Microtea, and Ancistrocarpus and other related genera should be included in it. Microtea is divided into two major sister clades: clade A consisting of M.glochidiata, M.maypurensis and M.tenuifolia, and clade B comprising M.debilis, M.sulcicaulis, M.scabrida, M.celosioides, and M.papillosa. The nrDNA dataset (ITS), although containing only a limited number of accessions, shows the same species number in clade A, and the remaining species studied (M.debilis, M.scabrida and M.celosioides) form clade B. Subgeneric status is assigned to clades A and B corresponding with the names Microteasubgen.Ancistrocarpus subgen. nov. and Microteasubgen.Microtea, respectively. The diagnostic characters at the subgeneric level are as follows: length of pedicels, number of flowers at each node, number of stamens and styles. A multivariate analysis of 13 distinguishing morphological characters supports the results of phylogenetic analysis. All species have similar pericarp and seed ultrasculpture and anatomy, and they share the reticulate pericarp surface (independent of presence or absence of finger-shaped outgrowths on its surface) and rugose or slightly alveolate seed ultrasculpture. On the basis of morphological characters, we accept 10 Microtea species. A checklist includes a new diagnostic key, morphological descriptions and distribution patterns of each species. Galeniacelosioides is the oldest legitimate name available for the plants previously known as Microteapaniculata, for which the combination Microteacelosioides is validated here. The neotypes of Galeniacelosioides and Microteasprengelii were designated from the collections of Prinz Wied at BR. The name M.foliosa is discussed and finally synonymized with M.scabrida. The lectotypes of Ancistrocarpusmaypurensis (≡Microteamaypurensis), Microteadebilisvar.ovata (=M.debilis), M.glochidiata, M.maypurensisvar.angustifolia (=M.tenuifolia), M.glochidiataf.lanceolata (=M.maypurensis), M.longebracteata (=M.celosioides), M.paniculatavar.latifolia (=M.scabrida), M.portoricensis, M.scabrida, M.sulcicaulis, and Potamophilaparviflora (=M.maypurensis) are designated. Microteasulcicaulis is reported for the first time as native to Bolivia, and M.maypurensis is reported from Indonesia (Java), where it is found as an alien plant with an unclear invasion status. |
format | Online Article Text |
id | pubmed-6335385 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Pensoft Publishers |
record_format | MEDLINE/PubMed |
spelling | pubmed-63353852019-01-17 Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales Sukhorukov, Alexander P. Sennikov, Alexander N. Nilova, Maya V. Mazei, Yuri Kushunina, Maria Marchioretto, Maria Salete Hanáček, Pavel PhytoKeys Research Article Abstract. The basal position of the small American genus Microtea within the core Caryophyllales was suggested only recently in accordance with molecular phylogeny. However, the specific relationships within the genus were not traced. The results of our phylogenetic analysis based on the matK chloroplast gene suggest the monophyly of Microtea, and Ancistrocarpus and other related genera should be included in it. Microtea is divided into two major sister clades: clade A consisting of M.glochidiata, M.maypurensis and M.tenuifolia, and clade B comprising M.debilis, M.sulcicaulis, M.scabrida, M.celosioides, and M.papillosa. The nrDNA dataset (ITS), although containing only a limited number of accessions, shows the same species number in clade A, and the remaining species studied (M.debilis, M.scabrida and M.celosioides) form clade B. Subgeneric status is assigned to clades A and B corresponding with the names Microteasubgen.Ancistrocarpus subgen. nov. and Microteasubgen.Microtea, respectively. The diagnostic characters at the subgeneric level are as follows: length of pedicels, number of flowers at each node, number of stamens and styles. A multivariate analysis of 13 distinguishing morphological characters supports the results of phylogenetic analysis. All species have similar pericarp and seed ultrasculpture and anatomy, and they share the reticulate pericarp surface (independent of presence or absence of finger-shaped outgrowths on its surface) and rugose or slightly alveolate seed ultrasculpture. On the basis of morphological characters, we accept 10 Microtea species. A checklist includes a new diagnostic key, morphological descriptions and distribution patterns of each species. Galeniacelosioides is the oldest legitimate name available for the plants previously known as Microteapaniculata, for which the combination Microteacelosioides is validated here. The neotypes of Galeniacelosioides and Microteasprengelii were designated from the collections of Prinz Wied at BR. The name M.foliosa is discussed and finally synonymized with M.scabrida. The lectotypes of Ancistrocarpusmaypurensis (≡Microteamaypurensis), Microteadebilisvar.ovata (=M.debilis), M.glochidiata, M.maypurensisvar.angustifolia (=M.tenuifolia), M.glochidiataf.lanceolata (=M.maypurensis), M.longebracteata (=M.celosioides), M.paniculatavar.latifolia (=M.scabrida), M.portoricensis, M.scabrida, M.sulcicaulis, and Potamophilaparviflora (=M.maypurensis) are designated. Microteasulcicaulis is reported for the first time as native to Bolivia, and M.maypurensis is reported from Indonesia (Java), where it is found as an alien plant with an unclear invasion status. Pensoft Publishers 2019-01-09 /pmc/articles/PMC6335385/ /pubmed/30655713 http://dx.doi.org/10.3897/phytokeys.115.29041 Text en Alexander P. Sukhorukov, Alexander N. Sennikov, Maya V. Nilova, Yuri Mazei, Maria Kushunina, Maria Salete Marchioretto, Pavel Hanáček http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Sukhorukov, Alexander P. Sennikov, Alexander N. Nilova, Maya V. Mazei, Yuri Kushunina, Maria Marchioretto, Maria Salete Hanáček, Pavel Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title | Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title_full | Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title_fullStr | Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title_full_unstemmed | Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title_short | Evolutionary relationships and taxonomy of Microtea (Microteaceae), a basal lineage in the core Caryophyllales |
title_sort | evolutionary relationships and taxonomy of microtea (microteaceae), a basal lineage in the core caryophyllales |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6335385/ https://www.ncbi.nlm.nih.gov/pubmed/30655713 http://dx.doi.org/10.3897/phytokeys.115.29041 |
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