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Genetic structure of East Asian cultivated pears (Pyrus spp.) and their reclassification in accordance with the nomenclature of cultivated plants

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Abstract

By use of Bayesian statistical inference and allelic data for 18 microsatellite loci, we analyzed the genetic structure of Chinese, Korean, and Japanese pear cultivars and of native populations of Pyrus ussuriensis. Although Japanese pear cultivars had a simple genetic structure, Chinese and Korean pear cultivars were admixures of Japanese pear and native P. ussuriensis from the Asian continent. Genetic differentiation between groups of native populations and those of cultivars was high, but cultivars were not well differentiated from each other. Chinese and Korean cultivars, which have traditionally been classified as either P. ussuriensis, P. bretschneideri, or P. pyrifolia, were much closer to Japanese cultivars, which have traditionally been classified as P. pyrifolia, than to native P. ussuriensis. We propose a new classification of cultivars by using the Group concept in accordance with the International Nomenclature for Cultivated Plants, namely, the Pyrus Ussurian pear group, the Pyrus Chinese white pear group, the Pyrus Chinese sand pear group, and the Pyrus Japanese pear group.

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Acknowledgments

We are grateful to Dr K. Hummer and Dr J. Postman of the National Clonal Germplasm Repository (Corvallis, Oregon, USA), Dr A. Gontcharov of the Institute of Biology and Soil Science (Far-East Branch) of the Russian Academy of Sciences, Vladivostok, Russia, and Dr H. Ikeda of the University of Tokyo for collecting and sending us plant materials. We also thank the anonymous reviewers for their helpful comments. This study was supported partly by a Grant-in Aid (no. 21510251) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. NARO Institute of Fruit Tree Science, National Agriculture and Food Research Organization, 2-1 Fujimoto, Tsukuba, Ibaraki, 305-8605, Japan

    Hiroyuki Iketani, Nobuko Mase, Yoshihiko Sato & Toshiya Yamamoto

  2. Food Resources Education and Research Center, Graduate School of Agricultural Science, Kobe University, 1348 Uzuranocho, Kasai, Hyogo, 675-2103, Japan

    Hironori Katayama

  3. Botanical Gardens, Faculty of Science, Osaka City University, 2000 Kisaichi, Katano, Osaka, 576-0004, Japan

    Chiyomi Uematsu

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  1. Hiroyuki Iketani
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Correspondence to Hiroyuki Iketani.

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606_2012_670_MOESM1_ESM.pdf

Table S 1 Detailed information about vernacular names, accession numbers, and voucher specimens of plant materials.Table S 2 Detailed information about the microsatellite markers used in this study. (PDF 123 kb)

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Iketani, H., Katayama, H., Uematsu, C. et al. Genetic structure of East Asian cultivated pears (Pyrus spp.) and their reclassification in accordance with the nomenclature of cultivated plants. Plant Syst Evol 298, 1689–1700 (2012). https://doi.org/10.1007/s00606-012-0670-0

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