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Plant Systematics and Evolution

, Volume 305, Issue 2, pp 127–137 | Cite as

Hybridization, coexistence, and possible reproductive interference between native Oxalis corniculata and alien O. dillenii in Japan

  • Misaki Fukatsu
  • Sachiko Horie
  • Masayuki Maki
  • Ikumi DohzonoEmail author
Original Article

Abstract

Hybridization with alien species can affect the reproduction and persistence of native species. Native Oxalis corniculata and alien O. dillenii are distributed in human-made habitats in Japan, and they coexist with their putative hybrid. We examined the origin of the putative hybrid and the possibility of introgression and reproductive interference between these species by analyzing their morphological, cytological, genetic, and reproductive characteristics. The flower morphology of the putative hybrid was similar to the alien species. The chromosome complement and the amount of nuclear DNA of the putative hybrid were intermediate between the two species. Genotyping of the nuclear ITS region showed the putative hybrid was invariably heterozygous for native and alien alleles. Haplotyping of the chloroplast trnS–trnG region showed that 22 and four hybrids had their maternal origin in the alien and native species, respectively. The ovules of the putative hybrid were sterile. When pollen of the putative hybrid was applied to flowers of the parental species, the fruit set was very low, suggesting that their pollen is only marginally viable. Based on these results, we conclude that the putative hybrid is an F1 hybrid between native and alien Oxalis species. The hybrid is virtually sterile, indicating that hybridization led to a waste of gametes and may result in reproductive interference between the two parental species. The capacity for selfing and/or asexual reproduction may weaken reproductive interference between the species; alternatively, their apparent coexistence may be maintained by dispersal from different parental habitats.

Keywords

Alien species Hybridization Hybrid sterility Introgression Reproductive interference 

Notes

Acknowledgments

We thank T. Sugawara, A. Iwamoto, and T. Fukuda for their advice with the cytological experiments, M. Kimura and other members of the laboratory of TGU for their help in fieldwork, and Y. Takami for his valuable comments based on critical readings of manuscript. We also thank the National BioResource Project Lotus/Glycine for providing the seeds of L. japonicus Gifu B-129. This work was supported by the Tokyu Foundation for a Better Environment, Nissei Foundation, and the Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (15K12255).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

606_2018_1557_MOESM1_ESM.pdf (68 kb)
Supplementary material 1 (PDF 67 kb)
606_2018_1557_MOESM2_ESM.pdf (87 kb)
Supplementary material 2 (PDF 86 kb)
606_2018_1557_MOESM3_ESM.pdf (71 kb)
Supplementary material 3 (PDF 71 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Environmental SciencesTokyo Gakugei UniversityKoganei, TokyoJapan
  2. 2.Botanical GardensTohoku UniversityKawauchi, SendaiJapan

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