Molecular evidence for asymmetric hybridization in three closely related sympatric species

AoB Plants
Ning-Ning ZhangXun Gong

Abstract

Natural hybridization is common in plants and results in different evolutionary consequences to hybridizing species. Pre- and post-zygotic reproductive isolating barriers can impede hybridization between closely related species to maintain their species integrity. In Northwest Yunnan, threeLigulariaspecies (Ligularia cyathiceps,L. duciformisandL. yunnanensis) and four types of morphologically intermediate individuals were discovered growing together in an area subject to human disturbance. In this study, we used three low-copy nuclear loci to test the natural hybridization hypothesis and the hybridization direction was ascertained by three chloroplast DNA fragments. The results indicated there were two hybridization groups at the study site,L. cyathiceps×L. duciformisandL. duciformis×L. yunnanensis, and two types of morphologically intermediate individuals were produced byL. cyathicepsandL. duciformis, and another two types were produced byL. duciformisandL. yunnanensis, while no hybrids betweenL. cyathicepsandL. yunnanensiswere observed. Both hybridizing groups showed bidirectional but asymmetric hybridization and the factors influencing the symmetry are discussed. Most hybrids produced by the two hybridization groups seemed t...Continue Reading

References

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Methods Mentioned

BETA
cloning sequencing
PCR
electrophoresis

Software Mentioned

PAUP
DNASTAR
Geneious Pro
DnaSP
Network

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