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Michael Moller - One of the best experts on this subject based on the ideXlab platform.

  • Gene duplication and relaxation from selective constraints of GCYC genes correlated with various floral symmetry patterns in Asiatic Gesneriaceae tribe Trichosporeae
    2019
    Co-Authors: Kuan-ting Hsin, Michael Moller, Chun-neng Wang
    Abstract:

    Floral bilateral symmetry is one of the most important acquisitions in flower shape evolution in angiosperms. Members of Gesneriaceae possess predominantly zygomorphic flowers yet natural reversal to actinomorphy have independently evolved multiple times. The development of floral bilateral symmetry relies greatly on the gene CYCLOIDEA (CYC). Our reconstructed GCYC phylogeny indicated at least five GCYC duplication events occurred over the evolutionary history of Gesneriaceae. However, the patterns of GCYC expression following the duplications and the role of natural selection on GCYC copies in relation to floral symmetry remained largely unstudied. The Asiatic tribe Trichosporeae contains most reversals to actinomorphy. We thus investigated shifts in GCYC gene expression among selected zygomorphic species (Hemiboea bicornuta and Lysionotus pauciflorus) and species with reversals to actinomorphy (Conandron ramondioides) by RT-PCR. In the actinomorphic C. ramondioides, none of the three copies of GCYC was found expressed in petals implying that the reversal was a loss-of-function event. On the other hand, both zygomorphic species retained one GCYC1 copy that was expressed in the dorsal petals but each species utilized a different copy (GCYC1C for H. bicornuta and GCYC1D for L. pauciflorus). Together with previously published data, it appeared that GCYC1C and GCYC1D copies diversified their expression in a distinct species-specific pattern. To detect whether the selection signal (ω) changed before and after the duplication of GCYC1 in Asiatic Trichosporeae, we reconstructed a GCYC phylogeny using maximum likelihood and Bayesian inference algorithms and examined selection signals using PAML. The PAML analysis detected relaxation from selection right after the GCYC1 duplication (ωpre-duplication = 0.2819, ωpost-duplication = 0.3985) among Asiatic Trichosporeae species. We propose that the selection relaxation after the GCYC1 duplication created an "evolutionary window of flexibility" in which multiple copies were retained with randomly diverged roles for dorsal-specific expressions in association with floral symmetry changes.

  • streptocarpus peltatus Gesneriaceae a distinctive new species from southeastern madagascar
    Novon, 2018
    Co-Authors: Armand Randrianasolo, Peter B Phillipson, Porter P Lowry, Michael Moller
    Abstract:

    Streptocarpus peltatus Randrian., Phillipson, Lowry & Mich. Moller (Gesneriaceae) is described as a new species from southeastern Madagascar. It differs from other Malagasy members of the genus by its distinctly peltate leaves that are glabrous on both surfaces and by the absence of staminodes. It is only known from a small area of mid-elevation humid forest on the eastern slopes of the Vohimena Range in southeastern Madagascar. An illustration and color images are provided along with a distribution map and a risk of extinction assessment following the IUCN Red List categories and criteria, which indicates a status of Critically Endangered.

  • oreocharis ninglangensis a showy new species of Gesneriaceae from northwestern yunnan in china
    Phytotaxa, 2016
    Co-Authors: Wenhong Chen, Michael Moller, Runzheng Chen, Kai Wen, Yumin Shui
    Abstract:

    A new species of Oreocharis (Gesneriaceae) from northwestern Yunnan in China is described and illustrated. The new species, Oreocharis ninglangensis , is most similar to O. delavayi, but it can be easily distinguished from it by conspicuous red stripes inside the corolla mouth and by the finely bullate leaf surface in the latter.

  • taxonomic status phylogenetic affinities and genetic diversity of a presumed extinct genus paraisometrum w t wang Gesneriaceae from the karst regions of southwest china
    PLOS ONE, 2014
    Co-Authors: Wenhong Chen, Fang Wen, Yumin Shui, Zhirong Zhang, Junbo Yang, Hong Wang, Kanae Nishii, Michael Moller
    Abstract:

    Background: The karst regions in South China have an abundance of endemic plants that face high extinction risks. The Chinese Gesneriaceae endemic Paraisometrum mileense (= Oreocharis mileensis), was presumed extinct for 100 years. After its re-discovery, the species has become one of five key plants selected by the Chinese forestry government to establish a new conservation category for plants with extremely small populations. For conservation purposes, we studied the phylogenetic and population genetic status of P. mileense at the three only known localities in Guangxi, Guizhou and Yunnan.

  • three new species of petrocodon Gesneriaceae endemic to the limestone areas of southwest china and preliminary insights into the diversification patterns of the genus
    Systematic Botany, 2014
    Co-Authors: Michael Moller, Wenhong Chen, Yumin Shui, Hong Wang, Junbo Yang
    Abstract:

    Three new species of Gesneriaceae, Petrocodon ainsliifolius, Petrocodon litizophilus, Petrocodon viridescens, from limestone areas of Yunnan, China are described and illustrated. Their independent species status is demonstrated in phylogenetic analyses using nuclear ribosomal internal transcribed spacer and chloroplast trnLF intron-spacer sequences. The phylogenetic and taxonomic relationships with their congeners are discussed from a morphological point of view. Morphological convergences, particularly of the flower, appear to characterize this calciphilous genus. Preliminary results are based on the material included, phylogenetic relationships inferred, and geographic distributions. The limestone area in Southeast Yunnan and West Guangxi appears as the center of origin and diversification of Petrocodon, with separate range expansions to eastern karst regions.

Fang Wen - One of the best experts on this subject based on the ideXlab platform.

  • pseudochirita trifoliata Gesneriaceae a new species from karst limestone in northern vietnam
    Phytotaxa, 2021
    Co-Authors: Truong Van Do, Yigang Wei, Zibing Xin, Dechang Meng, Mai Thi Hoang, Fang Wen
    Abstract:

    Pseudochirita trifoliata, a new Gesneriaceae species from Pu Luong-Cuc Phuong limestone mountain range in northern Vietnam is described and illustrated here. This new taxon is the second species of the narrowly endemic genus Pseudochirita which is known from limestone areas in southern China and northern Vietnam. It is easily distinguished from P. guangxiensis by a set of differences on the leaves, bracts, calyx, external corolla indumentum, staminode number, pistil length, ovary indumentum, style indumentum, and capsule length. A detailed description, illustration, information on distribution, ecology, phenology, provisional conservation assessment using IUCN categories and criteria of the proposed new species, and comparison with its similar species, are also provided.

  • Taxonomy of Gesneriaceae in China and Vietnam
    'Pensoft Publishers', 2021
    Co-Authors: Wenhong Chen, Fang Wen, Yigang Wei, Yumin Shui, Xin Hong, Ming-xun Ren, Ming Kang, Zhijing Qiu
    Abstract:

    China and Vietnam are important center of biodiversity worldwide. Gesneriaceae is a family with extraordinary species richness in China and Vietnam. Within the family, there are more than 600 accepted species in China. The species number will considerably surpass 700 species in China and Vietnam. Furthermore, the massive karst regions between China and Vietnam will provide mega-diverse ecological niches and imply the numerous potential unknown species needing for new discovery. After a long-term collaboration between China and Vietnam, many new findings have been made and research continues even more intensively now-a-days. The special issue will focus on the taxonomy of Gesneriaceae and research progress in China and Vietnam

  • primulina spiradiclioides Gesneriaceae a new species from limestone areas in guangxi china
    Annales Botanici Fennici, 2020
    Co-Authors: Zibing Xin, Zhangjie Huang, Bingmou Wang, Fang Wen
    Abstract:

    Primulina spiradiclioides Z.B. Xin & F. Wen (Gesneriaceae), a new species from limestone areas in Guangxi, China, is described and illustrated. It resembles P. curvituba, but can be easily distinguished from it by several characters, especially by its straight corolla tube. We found only one population with fewer than 200 mature individuals at the type locality.

  • two new species of oreocharis Gesneriaceae from karst regions in yunnan and notes on o tetraptera and o brachypoda from china
    PhytoKeys, 2020
    Co-Authors: Lei Cai, Fang Wen, Zhangjie Huang, Zhiling Dao
    Abstract:

    Two new species of Gesneriaceae, Oreocharis aimodisca and O. longipedicellata, from the limestone area of Yunnan Province, China, are described and illustrated. Their morphological relationship with similar species is discussed and colour photographs, detailed descriptions, distribution and habitat, as well as the IUCN endangered status are provided. We also discuss the accuracy of the scientific names of the described species O. tetrapterus from Guangxi, China in 2019 and O. brachypodus from Guizhou, China, in 2015, and put forward corrections related to name form.

  • primulina flexusa sp nov Gesneriaceae from guizhou province china
    PhytoKeys, 2020
    Co-Authors: Tao Peng, Bo Pan, Stephen Maciejewski, Fang Wen
    Abstract:

    The limestone regions of Yunnan-Guangxi-Guizhou in southern and southwestern China are regarded as some of biodiversity's hotspots for China's Gesneriaceae where numerous rare new species of Primulina have been, or are being, described over the past two decades. Primulina flexusa, a new lithophytic species of Gesneriaceae from a limestone hill in a Karst area, from Guizhou, China, is described here with color photographs. It is similar to P. curvituba, but can be easily distinguished by a combination of characteristics, especially in the shape and length of its capsule. We found only one population with approximately 100 mature individuals at the type locality. This new species is provisionally assessed as Critically Endangered [CR C1] by using IUCN criteria.

Anton Weber - One of the best experts on this subject based on the ideXlab platform.

  • the current status of the species hitherto assigned to henckelia Gesneriaceae
    Edinburgh Journal of Botany, 2013
    Co-Authors: David J Middleton, Anton Weber, Tze Leong Yao, Susanne Sontag, Michael Moller
    Abstract:

    Following recent molecular phylogenetic studies in Old World Gesneriaceae the nomenclatural implications for names in Henckelia are examined. New combinations are made in Codonoboea and Loxocarpus to account for species now excluded from Henckelia. A list is presented in which the current position of all species hitherto assigned to Henckelia is given, including the new combination Henckelia rotundata (Barnett) D.J.Middleton & Mich.Moller. A new combination in Oreocharis is made.

  • pair flowered cymes in the lamiales structure distribution and origin
    Annals of Botany, 2013
    Co-Authors: Anton Weber
    Abstract:

    Background and aims In the Lamiales, indeterminate thyrses (made up of axillary cymes) represent a significant inflorescence type. However, it has been largely overlooked that there occur two types of cymes: (1) ordinary cymes, and (2) 'pair-flowered cymes' (PFCs), with a flower pair (terminal and front flower) topping each cyme unit. PFCs are unique to the Lamiales and their distribution, origin and phylogeny are not well understood. Methods The Lamiales are screened as to the occurrence of PFCs, ordinary cymes and single flowers (constituting racemic inflorescences). Key results PFCs are shown to exhibit a considerable morphological and developmental diversity and are documented to occur in four neighbouring taxa of Lamiales: Calceolariaceae, Sanango, Gesneriaceae and Plantaginaceae. They are omnipresent in the Calceolariaceae and almost so in the Gesneriaceae. In the Plantaginaceae, PFCs are restricted to the small sister tribes Russelieae and Cheloneae (while the large remainder has single flowers in the leaf/bract axils; ordinary cymes do not occur). Regarding the origin of PFCs, the inflorescences of the genus Peltanthera (unplaced as to family; sister to Calceolariaceae, Sanango and Gesneriaceae in most molecular phylogenies) support the idea that PFCs have originated from paniculate systems, with the front-flowers representing remnant flowers. Conclusions From the exclusive occurrence of PFCs in the Lamiales and the proximity of the respective taxa in molecular phylogenies it may be expected that PFCs have originated once, representing a synapomorphy for this group of taxa and fading out within the Plantaginaceae. However, molecular evidence is ambiguous. Depending on the position of Peltanthera (depending in turn on the kind and number of genes and taxa analysed) a single, a double (the most probable scenario) or a triple origin appears conceivable.

  • part of a special issue on inflorescences pair flowered cymes in the lamiales structure distribution and origin
    2013
    Co-Authors: Anton Weber
    Abstract:

    †Background and Aims In the Lamiales, indeterminate thyrses (made up of axillary cymes) represent a significant inflorescence type. However, it has been largely overlooked that there occur two types of cymes: (1) ordinary cymes, and (2) ‘pair-flowered cymes’ (PFCs), with a flower pair (terminal and front flower) topping each cyme unit. PFCs are unique to the Lamiales and their distribution, origin and phylogeny are not well understood. †Methods The Lamiales are screened as to the occurrence of PFCs, ordinary cymes and single flowers (constituting racemic inflorescences). †Key Results PFCs are shown to exhibit a considerable morphological and developmental diversity and are documented to occur in four neighbouring taxa of Lamiales: Calceolariaceae, Sanango, Gesneriaceae and Plantaginaceae. They are omnipresent in the Calceolariaceae and almost so in the Gesneriaceae. In the Plantaginaceae, PFCs are restricted to the small sister tribes Russelieae and Cheloneae (while the large remainder has single flowers in the leaf/bract axils; ordinary cymes do not occur). Regarding the origin of PFCs, the inflorescences of the genus Peltanthera (unplaced as to family; sister to Calceolariaceae, Sanango and Gesneriaceae in most molecular phylogenies) support the idea that PFCs have originated from paniculate systems, with the frontflowers representing remnant flowers. †Conclusions From the exclusive occurrence of PFCs in the Lamiales and the proximity of the respective taxa in molecular phylogenies it may be expected that PFCs have originated once, representing a synapomorphy for this group of taxa and fading out within the Plantaginaceae. However, molecular evidence is ambiguous. Depending on the position of Peltanthera (depending in turn on the kind and number of genes and taxa analysed) a single, a double (the most probable scenario) or a triple origin appears conceivable.

  • inclusion of metabriggsia into hemiboea Gesneriaceae
    Phytotaxa, 2011
    Co-Authors: Anton Weber, Yigang Wei, Susanne Sontag, Michael Moller
    Abstract:

    Based on molecular data and morphology, Metabriggsia is reduced to synonymy with Hemiboea and its two species transferred to that genus.

  • a new definition of the genus petrocodon Gesneriaceae
    Phytotaxa, 2011
    Co-Authors: Anton Weber, Veronika Mayer, Yigang Wei, C Puglisi, F Wen, Michael Moller
    Abstract:

    Based on molecular studies, the small Chinese genus Petrocodon (two species and one variety) has been recently enlarged to include the monotypic genera Calcareoboea, Paralagarosolen and Tengia. It is shown here that the (6-7) species of Lagarosolen, the monotypic Dolicholoma, a few species of Didymocarpus, and a number of new species that have recently been published (but not formally described) under Petrocodon and Lagarosolen should be included in this genus. This raises the size of the genus from five to around 20 species. With respect to the floral diversity (corolla form, size, and coloration; with the exception of Tengia, the androecium is always diandrous) and inferred pollination syndromes (different forms of melittophily, ornithophily, psycho- and/or sphingophily), Petrocodon represents one of the most varied genera of Old World Gesneriaceae, comparable to some New World genera.

Quentin C. B. Cronk - One of the best experts on this subject based on the ideXlab platform.

  • diversity of cycloidea like genes in Gesneriaceae in relation to floral symmetry
    Annals of Botany, 2000
    Co-Authors: Helene L Citerne, Quentin C. B. Cronk, Michael Moller
    Abstract:

    Abstract Homology assessment of cycloidea -like genes was carried out in Gesneriaceae, a predominantly zygomorphic family in which several independent reversals to actinomorphy have occurred, as a basis for further investigation of the control and evolution of floral symmetry. Phylogenetic analysis of Gesneriaceae cycloidea ( Gcyc ) suggests that independent duplication and gene loss events have occurred during the evolution of this family after the split from Scrophulariaceae. Comparison of Gcyc sequences between zygomorphic and naturally occurring actinomorphic taxa does not suggest that reversals to actinomorphy were caused in these cases by loss of function of cyc -like genes. Examination of floral development in the nearly actinomorphic Ramonda myconi did not reveal any evidence of residual unequal dorso-ventral differentiation indicative of expression of Gcyc . This suggests that Gcyc may be expressed before primordia initiation in R. myconi , or may have additional functions not directly related to floral symmetry.

  • Phylogeny and disjunct distribution: evolution of Saintpaulia (Gesneriaceae).
    Proceedings of The Royal Society B: Biological Sciences, 1997
    Co-Authors: Michael Moller, Quentin C. B. Cronk
    Abstract:

    The molecular phylogeny of African violets (Saintpaulia H. Wendl.), based on ribosomal DNA internal transcribed spacer (ITS) sequences, follows the disjunct biogeography of the genus. Sequence anal...

  • origin and relationships of saintpaulia Gesneriaceae based on ribosomal dna internal transcribed spacer its sequences
    American Journal of Botany, 1997
    Co-Authors: Michael Moller, Quentin C. B. Cronk
    Abstract:

    Phylogenetic relationships of eight species of Saintpaulia H. Wendl., 19 species of Streptocarpus Lindl. (representing all major growth forms within the genus), and two outgroups (Haberlea rhodopensisFriv., Chirita spadiciformis W. T. Wang) were examined using comparative nucleotide sequences from the two internal transcribed spacers (ITS) of nuclear ribosomal DNA. The length of the ITS 1 region ranged from 228 to 249 base pairs (bp) and the ITS 2 region from 196 to 245 bp. Pairwise sequence divergence across both spacers for ingroup and outgroup species ranged from 0 to 29%. Streptocarpus is not monophyletic, and Saintpaulia is nested within Streptocarpus subgenus Streptocarpella. Streptocarpus subgenus Streptocarpus is monophyletic. The ITS sequence data demonstrate that the unifoliate Streptocarpus species form a clade, and are also characterized by a unique 47-bp deletion in ITS 2. The results strongly support the monophyly of (1) Saintpaulia, and (2) Saintpaulia plus the African members of the subgenus Streptocarpella of Streptocarpus. The data suggest the evolution of Saintpaulia from Streptocarpus subgenus Streptocarpella. The differences in flower and vegetative characters are probably due to ecological adaptation leading to a relatively rapid radiation of Saintpaulia. The genus Saintpaulia (Gesneriaceae, subfamily Cyrtandroideae) is endemic to Eastern Africa. It forms a geographically restricted aggregate of ;20 species ranging from the Teita Hills in the south of Kenya to the Uluguru Mountains in eastern Tanzania, with the center of species diversity being the Usambara Mountains of northeast Tanzania (Burtt, 1958). Saintpaulia species were first introduced to cultivation in Europe in 1892 by Baron Walter von Saint Paul, and within years became a popular house plant, and are now the basis of a large horticultural industry (Robey, 1988). The relationships of Saintpaulia to other genera of Gesneriaceae have been disputed. This is partly a result of the genus being characterized by an almost rotate corolla and the near absence of a corolla tube, which are comparatively unusual features in the Gesneriaceae, although they occur in a few other species, such as Boea, Petrocosmea, Platystemma, and Ramonda. Ivanina (1966) even suggested that Saintpaulia occupied its own tribe, Saintpaulieae. However, Hilliard and Burtt (1971, pp. 114‐115) wrote: ‘‘Until re1

Yumin Shui - One of the best experts on this subject based on the ideXlab platform.

  • Taxonomy of Gesneriaceae in China and Vietnam
    'Pensoft Publishers', 2021
    Co-Authors: Wenhong Chen, Fang Wen, Yigang Wei, Yumin Shui, Xin Hong, Ming-xun Ren, Ming Kang, Zhijing Qiu
    Abstract:

    China and Vietnam are important center of biodiversity worldwide. Gesneriaceae is a family with extraordinary species richness in China and Vietnam. Within the family, there are more than 600 accepted species in China. The species number will considerably surpass 700 species in China and Vietnam. Furthermore, the massive karst regions between China and Vietnam will provide mega-diverse ecological niches and imply the numerous potential unknown species needing for new discovery. After a long-term collaboration between China and Vietnam, many new findings have been made and research continues even more intensively now-a-days. The special issue will focus on the taxonomy of Gesneriaceae and research progress in China and Vietnam

  • reassessment of bournea oliver Gesneriaceae based on molecular and palynological evidence
    PhytoKeys, 2020
    Co-Authors: Wenhong Chen, Yamei Zhang, Shiwei Guo, Zhirong Zhang, Li Chen, Yumin Shui
    Abstract:

    The former genus Bournea is endemic to China, including two species, has been under consideration for incorporation into the expanded genus Oreocharis s.l. in Gesneriaceae. The phylogenetic tree inferred from two DNA sequences (trnL-F and ITS) showed that this genus is deeply nested into Oreocharis s.l. However, the new tree from seven ones (atpB-rbcL, ndhH-rps15-ycf1, rpl132, trnC-trnD, trnL-F, trnT-trnL of chloroplast DNA and ITS regions) revealed that Bournea is the sister group of other of Oreocharis s.l. Furthermore, Bournea is morphologically different from other Oreocharis based on existing data. We suggest keeping Bournea as an independent genus in Gesneriaceae.

  • four new species of oreocharis Gesneriaceae in yunnan province china
    PhytoKeys, 2020
    Co-Authors: Wenhong Chen, Yamei Zhang, Yumin Shui
    Abstract:

    Four new species of Oreocharis (Gesneriaceae) are described and illustrated. These new species grow in pairs in montane forests in Yunnan province, China. One pair grows in Wenshan county, Southeast Yunnan, viz. Oreocharis eriocarpa W.H. Chen & Y.M. Shui and O. wenshanensis W.H. Chen & Y.M. Shui and another pair grows in Yongde county, Southwest Yunnan, viz. O. fulva W.H. Chen & Y.M. Shui and O. lacerata W.H. Chen & Y.M. Shui. Their morphological and geographical relationship with similar species is discussed and the IUCN endangered status is provided, based on the available data.

  • oreocharis jasminina Gesneriaceae a new species from mountain tops of hainan island south china
    PhytoKeys, 2020
    Co-Authors: Shaojun Ling, Fang Wen, Yumin Shui, Shuping Guan, Ming-xun Ren
    Abstract:

    A new species of Gesneriaceae, Oreocharis jasminina S.J.Ling, F.Wen & M.X. Ren from Hainan Island, south China, is highlighted and described. The new species is distinguished by its actinomorphic corolla, narrow floral tube and ovate anthers hidden in the floral tube. The new species also showed clear geographic and altitudinal isolation from the three currently-recognised Oreocharis species on the Island. Molecular phylogenetic analysis, based on nuclear ITS1/2 and plastid trnL-trnF sequences, supported the delimitation of the new species, which forms a single lineage with all the other Oreocharis species from Hainan Island. The roles of geographic and floral isolation in the evolution of the new species and its affinities are discussed.

  • hemiboea crystallina a new species of Gesneriaceae from karst regions of china and vietnam
    Phytotaxa, 2018
    Co-Authors: Wenhong Chen, Yamei Yamei Zhang Zhang, Quanghieu Nguyen, Tienhiep Nguyen, Yumin Shui
    Abstract:

    A new species of Gesneriaceae, Hemiboea crystallina Y.M.Shui & W.H.Chen from China and Vietnam, is described and illustrated. The new species is diagnostic by the combination of its inflated nodes, glabrous stem, glabrous and lanceolate leaves, 4-winged involucre, margin-reflected calyx segments and the glabrous surface inside corolla. Among the species without hairy ring inside corolla, its morphological distinctiveness from the most similar species, Hemiboea flaccida Chun ex Z.Y.Li, is discussed.