Four new species of Begonia (Begoniaceae) from Vietnam: B. abbreviata, B. calciphila, B. sphenantheroides and B. tamdaoensis

Peng, Ching‐I; Yang, Hsun-An; Kono, Yoshiaki; Jung, Ming-Jer; Nguyên, Tiên Hiêp

doi:10.11646/phytotaxa.222.2.1

Cited by 11 publications

(14 citation statements)

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“…Previously, the lower chromosome numbers of Begonia (i.e.,2n=14,16,18,and 20) were all known from sect. Platycentrum, with karyotypes reported from B. wui-senioris (2n=14; Peng et al 2014c) and B. tamdaoensis (2n=18;Peng et al 2015c). Our current study of sect.…”

Section: Karyotype Analyses and Chromosome Evolutionsupporting

confidence: 60%

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Cytological Study of Begonia Sect. Diploclinium (Begoniaceae)

Kono

Peng²,

Oginuma

et al. 2021

CYTOLOGIA

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Previous chromosome information is restricted to 13 species in the Asian Begonia sect. Diploclinium.Here we present the first chromosome counts of three species, as well as confirmed their chromosome numbers of five species. Among three species investigated for the first time, the chromosome number of 2n=18 and 2n=32 are new counts in the section. Additionally, we provide the karyotypes of eight species for the first time. Among ca. 135 species in sect. Diploclinium, chromosome numbers of 16 species are available together with the present and previous reports. Among 16 species, they show diverse chromosome numbers with 2n=18, 22, 24, 26, 30, 32, 36, 46, and 54. B. wenshanensis with 2n=18 is the lowest chromosome number in the section and the third lowest chromosome number in Begonia. We suggest that B. coptidimontana with 2n=32 is tetraploid origin with the basic chromosome number of x=8. We discussed the chromosome evolution in Begonia sect. Diploclinium.

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Section: Karyotype Analyses and Chromosome Evolutionsupporting

confidence: 60%

“…In Asian Begonia, karyotypes have only been reported in four sections, i.e., sect. Baryandra (Kono et al 2021), Coelocentrum (Kono et al 2020), Diploclinium (Oginuma and Peng 2002), and Platycentrum (Oginuma and Peng 2002, Peng et al 2014c, 2015c. In sect.…”

Section: Karyotype Analyses and Chromosome Evolutionmentioning

confidence: 99%

Cytological Study of Begonia Sect. Diploclinium (Begoniaceae)

Kono

Peng²,

Oginuma

et al. 2021

CYTOLOGIA

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“…After review of the type specimens and taxonomic publications within the regions (Gagnepain 1921; Irmscher 1939; Ho 1991; Nguyen 2004; Shui and Chen 2005; Truong et al 2005; Nguyen and Tebbit 2006; Kiew 2007; Nguyen et al 2010; Peng et al 2014, 2015a,b; Hughes et al 2015), seven new species of Begonia have been confirmed, and their sectional positions designated here (Doorenbos et al 1998; Shui et al 2002). Due to the taxonomic complexity of the genus (Thomas et al 2011; Chung et al 2014), the DNA samples of the above new species have also been collected and some possible different opinions will be issued about their systematic position in the broad context in the future.…”

Section: Introductionmentioning

confidence: 85%

“…It is also similar as B. calciphila C.-I Peng in the shape and trichomes of leaves, but differs in 0.5–1.2 cm long stout inter-nodes ( vs. 1.5–4.5 cm long slender inter-nodes) and hairy flowers and fruits ( vs. glabrous in the latter species) (Peng et al 2015b). In Bac Kan Province, Vietnam, there are four new species already described, viz.…”

Section: Taxonomymentioning

confidence: 95%

Seven new species of Begonia (Begoniaceae) in Northern Vietnam and Southern China

Chen¹,

Radbouchoom²,

Nguyen³

et al. 2018

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Since 2016, KIB (Kunming Institute of Botany) and CPC (Centre for Plant Conservation of Vietnam) have conducted several surveys in the transboundary karst regions in Northern Vietnam and Southern China and seven new species in the genus Begonia Linn. (Begoniaceae) are firstly described. Amongst them, two species, Begonia albopunctata Y.M. Shui, W.H. Chen & H.Q. Nguyen and B. erectocarpa H.Q. Nguyen, Y.M. Shui & W.H. Chen, respectively belong to section Sphenanthera with berry fruits and section Leprosae with clavate berry fruits; four species, B. gulongshanensis Y.M. Shui & W. H. Chen, B. minissima H.Q. Nguyen, Y.M. Shui & W.H. Chen, B. mollissima Y.M. Shui, H.Q. Nguyen & W.H. Chen, B. rhytidophylla Y.M. Shui & W.H. Chen, belong to section Coelocentrum with parietal placentation; one species, Begonia bambusetorum H.Q. Nguyen, Y.M. Shui & W.H. Chen, belongs to section Diploclinium with 3-loculed ovary and capsules. The diagnostic characters of these species are described and illustrated in the text and photographs.

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“…1c), with the highest diversity in Guangxi (Gu et al 2007; Chung et al 2014). In the past two decades, explorations and taxonomic studies in the region have greatly expanded the number of species in the section from 15 (Ku 1999) to 78 (Chung et al 2014; Peng et al 2014, 2015a, b; Li et al 2016; Qin et al 2017b; Chen et al 2018). As a great portion of SVLK remains unexplored, it is fully expected that further exploration will undoubtedly uncover more novelties (Chen et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of Begonia luzhaiensis suggests both natural and anthropogenic causes for the marked population genetic structure

Tseng

Huang

et al. 2019

Bot Stud

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Background Sino-Vietnamese limestone karsts (SVLK) are a biodiversity hotspot rich in endemic plant species associated with caves and cave-like microhabitats. Based on phylogenetic studies of Begonia sect. Coelocentrum , a species-rich and characteristic SVLK clade, geographic isolation caused by extensive and continuous karstification was proposed as the major driving force triggering population diversification and geographic speciation. To test this proposition, population genetics and phylogeography of Begonia luzhaiensis were investigated using EST-SSR markers and the chloroplast trnC - ycf6 intergenic spacer. Results F statistics, Bayesian clustering analysis, AMOVA, and PCoA of both data sets all indicated substantial population differentiation and significant isolation by distance. Nested clade phylogeographic analyses inferred that historical fragmentations have been prominent, congruent with Guangxi’s geohistory of karstification as well as suggesting a mountain chain in northeastern Guangxi could have also acted as a major geographic barrier. A Bayesian skyline plot (BSP) indicated a slight decline in effective population size at 75,000 years ago (75 Kya), coinciding with the last glacial period during which the increased aridity in East Asia had retarded karstification, negatively affecting the populations of B. luzhaiensis . However, BSP detected a continuous and further population decline until the present time even though summer monsoons have resumed since the end of the last glacial maximum. Conclusions The microevolution patterns of B. luzhaiensis support that limited gene flow would have greatly enhanced the effects of random genetic drift and has been a major factor promoting diversification in Begonia , highly congruent with previous proposition. Based our study, we further propose that the arrival of Paleolithic Homo sapiens whose activities centered around limestone caves could have had further impacts on the populations of B. luzhaiensis , resulting in additional population decline. Further habitat destruction could have resulted from the transition from hunter gathering to food-producing societies ca. 20–10 Kya and the development of agriculture ca. 10 Kya in South China. Implications of the current study for SVLK plant conservation are also discussed. Electronic supplementary material The online version of this article (10.1186/s40529-019-0267-9) contains supplementary material, which is available to authorized users.

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Four new species of Begonia (Begoniaceae) from Vietnam: B. abbreviata, B. calciphila, B. sphenantheroides and B. tamdaoensis

Cited by 11 publications

References 3 publications

Cytological Study of <i>Begonia</i> Sect. <i>Diploclinium</i> (Begoniaceae)

Cytological Study of <i>Begonia</i> Sect. <i>Diploclinium</i> (Begoniaceae)

Seven new species of Begonia (Begoniaceae) in Northern Vietnam and Southern China

Phylogeography of Begonia luzhaiensis suggests both natural and anthropogenic causes for the marked population genetic structure

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