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Journal of Plant Research

, Volume 113, Issue 2, pp 203–215 | Cite as

Cytological and Reproductive Studies of Japanese Diplazium (Woodsiaceae; Pteridophyta). II. Polyploidy and Hybridity in the Species Group with Summer-Green Bi- to Tripinnate Leaves

  • Masayuki Takamiya
  • Noriko Ohta
  • Chika Fujimaru-Takaoka
  • Khota Uki

Diplazium

with summer-green bi- to tripinnate leaves. Diplazium mesosorum and D. sibiricum var. sibiricum are sexual diploids (2n=82; n=41ll); D. chinense and D. squamigerum are sexual tetraploids (2n=164; n=82ll); and D. sibiricum var. glabrum is a sterile triploid (2n=123; meiosis irregular). Diplazium nipponicum includes both sterile triploid and sexual tetraploid populations. The triploid is larger in relation to several morphological characteristics and occurs in more southern regions than the tetraploid. Allozyme analysis suggests that the triploid is a hybrid of recurrent origin between the tetraploid and an unknown diploid. Diplazium × bittyuense is a sterile tetraploid, and the mitotic chromosome number, meiotic chromosome behavior, and allozyme analysis confirm the working hypothesis that it is a hybrid between D. nipponicum and D. chinense. Apomicts are not found within Diplazium with summer-green bi- to tripinnate leaves, and the taxonomic complexity can be attributed to polyploidy and natural hybridization.

Keywords: Allozyme, Chromosome, Diplazium, Hybrid, Polyploid, Woodsiaceae 

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Copyright information

© The Botanical Society of Japan 2000

Authors and Affiliations

  • Masayuki Takamiya
    • 1
  • Noriko Ohta
    • 2
  • Chika Fujimaru-Takaoka
    • 3
  • Khota Uki
    • 3
  1. 1.Department of Environmental Science, Faculty of Science, Kumamoto University, Kurokami 2–39–1, Kumamoto, 860–8555 JapanJP
  2. 2.Department of Environmental Science, Graduate School of Science and Technology, Kumamoto University, Kurokami 2–39–1, Kumamoto, 860–8555 JapanJP
  3. 3.Department of Biological Science, Faculty of Science, Kumamoto University, Kurokami 2–39–1, Kumamoto, 860–8555 JapanJP

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