Latest Articles from PhytoKeys Latest 6 Articles from PhytoKeys https://phytokeys.pensoft.net/ Thu, 28 Mar 2024 23:47:43 +0200 Pensoft FeedCreator https://phytokeys.pensoft.net/i/logo.jpg Latest Articles from PhytoKeys https://phytokeys.pensoft.net/ Phylogenomics reveal Populus gonggaensis as a hybrid between P. lasiocarpa and P. cathayana (Salicaceae) https://phytokeys.pensoft.net/article/103012/ PhytoKeys 237: 161-177

DOI: 10.3897/phytokeys.237.103012

Authors: Wenyan Du, Yachao Wang, Dajun Xie, Enze Li, Yuran Bai, Ce Shang, Zhixiang Zhang

Abstract: High levels of intra-specific polymorphism and frequent hybridisation make it difficult to define species and correctly apply their scientific names. Populus L. is a challenging genus with plentiful natural and artificial hybrids. This study is a part of the project ‘Flora of Pan-Himalaya’ and aims to determine the taxonomic identity of P. gonggaensis N. Chao & J.R. He and to find out whether it is of hybrid origin. Whole-genome sequencing data were obtained from 57 samples. The SNP matrix was developed for phylogenetic reconstruction, ABBA-BABA statistics, PCA and ADMIXTURE analysis. The results indicate that P. gonggaensis is a spontaneous hybrid between P. lasiocarpa and P. cathayana. This study points out the importance of SNP data and comprehensive analyses for discovering the potential interspecific hybridisation and clarifies the usage of the name. In addition, the lectotype of P. gonggaensis was designated.

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Research Article Tue, 23 Jan 2024 14:43:06 +0200
A new species of Casearia Jacq. (Salicaceae) from Central Panama and insights into its phylogenetic position within the genus https://phytokeys.pensoft.net/article/108651/ PhytoKeys 236: 97-112

DOI: 10.3897/phytokeys.236.108651

Authors: Astrid de Mestier, Ernesto Campos Pineda, Marco Cedeño Fonseca, Orlando O. Ortiz

Abstract: We describe here a new species of Casearia from Panama based on both morphological and molecular data. Casearia isthmica sp. nov. is restricted to the mid-elevation cloud forests of Central Panama and presents morphological similarities with two more widespread species, C. sanchezii from high elevation areas of El Salvador and Mexico and C. tremula from the Caribbean, Central America, and Northern South America. Casearia isthmica differs in presenting pedunculated and congested inflorescences with up to 20 flowers, as well as flowers with 12 stamens and a pubescent style. Phylogenetic analysis based on selected plastid (petD, trnK-matK, rpl16 and rps4-trnLF) and nuclear (GBSSI and ITS) markers shows that the new species belongs to subclade B3 of Casearia, a lineage that encompasses species from Central America, Mexico and the Caribbean. Results of the morphological and molecular analysis were congruent and allowed a broader understanding of this new taxon, especially regarding its relationships to other Casearia.

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Research Article Wed, 6 Dec 2023 15:00:18 +0200
Genetic diversity of Salix lapponum populations in Central Europe https://phytokeys.pensoft.net/article/71641/ PhytoKeys 184: 83-101

DOI: 10.3897/phytokeys.184.71641

Authors: Jacek Urbaniak, Paweł Kwiatkowski, Paweł Pawlikowski

Abstract: Salix lapponum is a cold-tolerant relict species in Europe that occurs in several sites, probably reflecting previous migration routes of S. lapponum during the Pleistocene. However, only a few data are available on the genetic structures of populations of S. lapponum. In this study, we use PCR-ISSR markers to investigate genetic variation in 19 European populations of S. lapponum L. AMOVA analysis shows that most of the variation (55.8%) occurs within populations; variability among groups accounts for 19.7%. An AMOVA analysis based on four groups determined by STRUCTURE analysis shows similar results: variability of 54.1% within the population and variability of 18.9% between the four population groups, based on geographic regions. Within individual geographic groups, which are characterised by the studied populations, the lowest variability (as well as the highest homogeneity) was found in populations located in Belarus. The obtained results are consistent with our expectations that the European Lowland could be a significant geographic barrier for gene flow over large geographic distances for S. lapponum. Both the Scandinavian and Belarusian populations, as well as those coming from NE Poland, are characterised by significant genetic distinctiveness. However, some populations from NE Poland and the Sudetes show similarities with populations from other geographic regions, indicating existing genetic relationships between them. Moreover, the results suggest a fairly clear division of the population into 4 emerging geographic regions, although separated by a geographical barrier: the Polish lowland, which forms part of the larger geographic unit known as the European Lowland.

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Research Article Fri, 5 Nov 2021 09:52:15 +0200
The valid publication of Salix suchowensis (Salicaceae) https://phytokeys.pensoft.net/article/37065/ PhytoKeys 131: 27-35

DOI: 10.3897/phytokeys.131.37065

Authors: Li He, Shuai Liao, Wendy Applequist, Shipin Chen

Abstract: The nomenclatural problems of Salix suchowensis have been addressed by different authors with varying opinions. However, these efforts were flawed by a lack of observation of relevant specimens. Accordingly, we carefully checked relevant publications and specimens both through internet databases and herbarium visits. Here, we thoroughly review the nomenclatural history of Salix suchowensis in light of the new definition of a gathering in the Shenzhen Code. We conclude that this name was validly published in the original publication in 1963. Furthermore, a lectotype is designated for the precise application of the name. We hope this article will offer guidance for interpreting similar cases.

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Research Article Mon, 2 Sep 2019 10:33:49 +0300
Taxonomic status of Populus wulianensis and P. ningshanica (Salicaceae) https://phytokeys.pensoft.net/article/25600/ PhytoKeys 108: 117-129

DOI: 10.3897/phytokeys.108.25600

Authors: Lei Zhang, Mingcheng Wang, Tao Ma, Jianquan Liu

Abstract: Species delimitation in the genus Populus is particularly challenging due to high levels of intraspecific polymorphism as well as frequent interspecific hybridisation and introgression. In this study, we aimed to examine the taxonomic status of Populus ningshanica and P. wulianensis using an integrative taxonomy that considers multiple operational criteria. We carried out morphometric analyses of leaf traits and genetic examinations (including sequence variations at five barcoding DNAs and polymorphisms at 14 nuclear microsatellite SSR primers) at the population level between them and two closely related species P. adenopoda and P. davidiana. Results suggest that P. wulianensis belongs to the polymorphic species, P. adenopoda and should be considered as a synonym of the latter. P. ningshanica may have arisen as a result on the hybridisation between P. adenopoda and P. davidiana and therefore should be treated as P. × ningshanica. This study highlights the importance of the integrated evidence in taxonomic decisions of the disputed species.

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Research Article Mon, 10 Sep 2018 12:27:47 +0300
Homalium glandulosum (Salicaceae), a new species from Vu Quang National Park, North Central Vietnam https://phytokeys.pensoft.net/article/6816/ PhytoKeys 58: 97-104

DOI: 10.3897/phytokeys.58.6816

Authors: Shuichiro Tagane, Viet Hung Nguyen, Nguyen Van Ngoc, Hoang Thanh Son, Hironori Toyama, Chen-Jui Yang, Tetsukazu Yahara

Abstract: Homalium glandulosum Tagane & V. H. Nguyen, from Vu Quang National Park in northern Vietnam, is newly described. This species is characterized by distinct glands, often stalked, at the base of the lamina and along the margin of the stipules and bracteoles. Illustrations, DNA barcodes of the two regions of rbcL and matK, and a key to the species of Homalium in Vietnam are also provided.

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Research Article Tue, 12 Jan 2016 06:03:59 +0200