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Natural hybridization between two butterfly bushes in Tibet: dominance of F-1 hybrids promotes strong reproductive isolation
Liao,Rongli; Sun,Weibang; Ma,Yongpeng
2021
Source PublicationBMC PLANT BIOLOGY
ISSN1471-2229
Volume21Issue:1Pages:133
AbstractBackground It has been recognized that a certain amount of habitat disturbance is a facilitating factor for the occurrence of natural hybridization, yet to date we are unaware of any studies exploring hybridization and reproductive barriers in those plants preferentially occupying disturbed habitats. Buddleja plants (also called butterfly bush) generally do grow in disturbed habitats, and several species with hybrid origin have been proposed, based solely on morphological evidence. Results In the present study, we test the hypothesis that B. x wardii is of natural hybridization origin in two sympatric populations of three taxa including B. x wardii and its parents (B. alternifolia and B. crispa) plus 4 referenced parental populations, using four nuclear genes and three chloroplast intergenic spacers, as well as with 10 morphological characters. Our results suggest that at both sites B. x wardii is likely to be a hybrid between B. alternifolia and B. crispa, and moreover, we confirm that most of the hybrids examined are F(1)s. That these plants are F(1)s is further supported by morphology, as no transgressive characters were detected. B. crispa was found to be the maternal parent in the Bahe (BH) population, from cpDNA evidence. However, in the Taji (TJ) population, the direction of hybridization was difficult to establish due to the shared cpDNA haplotypes between B. alternifolia and B. crispa, however we still predicted a similar unidirectional hybridization pattern due to results from cross-specific pollination treatments which supported the SI x SC rule. Conclusions The presence of mainly F-1 hybrids can successfully impede gene flow and thus maintain species boundaries in parental species in a typical distribution of Buddleja, i.e. in disturbed habitats.
KeywordButterfly bushes Buddleja Hybridization F-1-dominated hybrids Reproductive isolation
DOI10.1186/s12870-021-02909-7
WOS IDWOS:000627372300001
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Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/73285
Collection中国科学院昆明植物研究所
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Yunnan Key Lab Integrat Conservat Plant Species E, Kunming 650201, Yunnan, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liao,Rongli,Sun,Weibang,Ma,Yongpeng. Natural hybridization between two butterfly bushes in Tibet: dominance of F-1 hybrids promotes strong reproductive isolation[J]. BMC PLANT BIOLOGY,2021,21(1):133.
APA Liao,Rongli,Sun,Weibang,&Ma,Yongpeng.(2021).Natural hybridization between two butterfly bushes in Tibet: dominance of F-1 hybrids promotes strong reproductive isolation.BMC PLANT BIOLOGY,21(1),133.
MLA Liao,Rongli,et al."Natural hybridization between two butterfly bushes in Tibet: dominance of F-1 hybrids promotes strong reproductive isolation".BMC PLANT BIOLOGY 21.1(2021):133.
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