A Natural Hybrid Between Ligularia paradoxa and L. duciformis (Asteraceae, Senecioneae) From Yunnan, China<sup>1</sup>

Pan, Yuezhi; Shi, Suhua; Gong, Xun; Kuroda, Chiaki

doi:10.3417/2006034

Cited by 26 publications

(38 citation statements)

References 24 publications

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“…According to cpDNA analysis, we can also conclude that the hybridization is bidirectional but predominantly in the form of L. subspicata ♀× L. nelumbifolia ♂ (A1–A5, A7, A10, A12). These results differ from those of Pan et al concerning natural hybrids between L. paradoxa and L. duciformis , in which hybridization was found to be unidirectional (Pan et al, 2008). This bidirectional hybridization suggests that the two parental species ( L. subspicata and L. nelumbifolia ) are equally cross‐compatible.…”

Section: Discussioncontrasting

confidence: 99%

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Kuroda

Gong

2011

J of Sytematics Evolution

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The difficulty in clarifying species of genus Ligularia Cass. has been attributed to rapid and continuous allopatric speciation in small and isolated populations, combined with interspecific diploid hybridization in the Qinghai‐Tibetan Plateau and adjacent areas. However, no concrete example has been reported to prove this hypothesis. We studied a natural mixed population of six species of Ligularia in which some individuals were morphologically intermediate between L. subspicata and L. nelumbifolia. Based on DNA sequences (trnC‐F, trnL‐rpL32, trnQ‐5′rps16, trnK‐rps16, and internal transcribed spacer) and inter‐simple sequence repeat data, we concluded that putative hybrids are primarily products of hybridization between L. nelumbifolia and L. subspicata. The other four species or additional, unknown species may also be involved in hybridization. This hybridization is bidirectional but asymmetrical. Hybrid individuals were mostly the first generation, but F2 and later‐generation hybrids were also present. Moreover, the backcrossed individuals detected indicate that natural gene flow occurs among at least three Ligularia species. Hybrids may become stabilized to form new species or may function as intermediates in evolutionary diversification.

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Section: Discussioncontrasting

confidence: 99%

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Kuroda

Gong

2011

J of Sytematics Evolution

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“…1) [52]. -The morphological observations and DNA data suggested that L. duciformis, L. kongkalingensis, and L. nelumbifolia constitute a continuous complex in northwestern Yunnan to western Sichuan Provinces of China.…”

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confidence: 99%

Chemical and Genetic Study of Ligularia duciformis and Related Species in Sichuan and Yunnan Provinces of China

Nagano

Hanai

Yamada

et al. 2012

Chemistry & Biodiversity

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The chemical constituents of the root extracts and the evolutionarily neutral DNA base sequences were studied for 28 samples of Ligularia duciformis, L. kongkalingensis, and L. nelumbifolia collected in Sichuan and Yunnan Provinces of China. The samples could be classified into four chemotypes (1-4). Sesquiterpenoids having eremophilane and oplopane skeletons were isolated from two (Chemotype 1) and three (Chemotype 2) samples, respectively. Two new oplopane derivatives were isolated and their structures were determined. In 18 samples, phenylpropenoids were the major components (Chemotype 3). In five samples, neither phenylpropenoids nor sesquiterpenoids were found (Chemotype 4). Despite this large chemical variety, no correlation was found between the chemotype and the morphological criteria of species identification. The analysis of the evolutionarily neutral DNA regions also indicated that the samples were not separated into distinct clades and that introgression was extensive.

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“…In addition to the three homoploid hybrid species known from the HMR that are discussed above, a number of further potential cases of homoploid hybrid species in the HMR are recorded for Rhododendron (R. agastum, R. duclouxii), Ligularia (L. × maoniushanensis) and Salix (S. × heteromera), respectively (Pan et al, 2008;Wu et al, 2015;Zha et al, 2009;Zhang, Zhang, Gao, et al, 2007). The species described as hybrid lineages in the HMR have not formed reproductive isolation with their parental species.…”

Section: Homoploid Hyb Rid S Peciati On In the Hmrmentioning

confidence: 98%

“…× maoniushanensis ) and Salix ( S . × heteromera ), respectively (Pan et al, ; Wu et al, ; Zha et al, ; Zhang, Zhang, Gao, et al, ). The species described as hybrid lineages in the HMR have not formed reproductive isolation with their parental species.…”

Section: Homoploid Hybrid Speciation In the Hmrmentioning

confidence: 99%

“…In the region, cases of hybrid speciation have been reported to date at the diploid level, that is, Pinus densata, Picea purpurea, and Ostryopsis intermedia (Lu, Tian, Liu, Yang, & Liu, 2014;Sun et al, 2014;Wang, Szmidt, & Savolainen, 2001). Additionally, more genera in the HMR are involved in naturally occurring homoploid hybridization within hybrid zones (Table S1), such as Ligularia (Pan, Shi, Gong, & Kuroda, 2008;Yu Kuroda, & Gong, 2011, 2014Yu, Pan, Pan, & Gong, 2014;Zhang, Yu, Wang, & Gong, 2018;Zhang, Gong, & Ryan, 2017), Rhododendron (Ma, Milne, Zhang, & Yang, 2010;Marczewski, Chamberlain, & Milne, 2015;Yan, Gao, & Li, 2013;Zha, Milne, & Sun, 2008;Zhang, Zhang, Gao, Yang, & Li, 2007), Primula (Ma, Tian, Zhang, Wu, & Sun, 2014), Roscoea (Du, Zhang, & Li, 2012), Silene (Zhang, Montgomery, & Huang, 2016), and Salix (Wu, Wang, Yang, & Chen, 2015).…”

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Homoploid hybridization of plants in the Hengduan mountains region

Yang

Folk

Zhang

et al. 2019

Ecology and Evolution

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The Hengduan Mountains Region (HMR) is a major global biodiversity hotspot. Complex tectonic and historical climatic conditions created opportunities for natural interspecific hybridization. Likewise, anthropogenic disturbance potentially raises the frequency of hybridization. Among species studies to date, the frequency of homoploid hybridization appears in the HMR. Of nine taxa in which natural hybridization has been detected, three groups are involved in homoploid hybrid speciation, and species pairs from the remaining six genera suggest that continuous gene flow occurs in hybrid zones. Reproductive isolation may greatly affect the dynamic and architecture of hybrid zones in the HMR. Asymmetrical hybridization and introgression can primarily be attributed to both prezygotic and postzygotic barriers. The frequent observation of such asymmetry may imply that reproductive barrier contributes to maintaining species boundaries in the alpine region. Ecological isolations with environmental disturbance may promote breeding barriers between parental species and hybrids. Hybrid zones may be an important phase for homoploid hybrid speciation. Hybrid zones potentially provided abundant genetic resources for the diversification of the HMR flora. The ecological and molecular mechanisms of control and mediation for natural hybridization will help biologists to understand the formation of biodiversity in the HMR. More researches from ecological and molecular aspects were required in future studies.

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A Natural Hybrid Between Ligularia paradoxa and L. duciformis (Asteraceae, Senecioneae) From Yunnan, China¹

Cited by 26 publications

References 24 publications

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Chemical and Genetic Study of Ligularia duciformis and Related Species in Sichuan and Yunnan Provinces of China

Homoploid hybridization of plants in the Hengduan mountains region

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A Natural Hybrid Between Ligularia paradoxa and L. duciformis (Asteraceae, Senecioneae) From Yunnan, China1

Cited by 26 publications

References 24 publications

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Natural hybridization and introgression in sympatricLigulariaspecies (Asteraceae, Senecioneae)

Chemical and Genetic Study of Ligularia duciformis and Related Species in Sichuan and Yunnan Provinces of China

Homoploid hybridization of plants in the Hengduan mountains region

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A Natural Hybrid Between Ligularia paradoxa and L. duciformis (Asteraceae, Senecioneae) From Yunnan, China¹