Dioecy in Wikstroemia pseudoretusa (Thymelaeaceae) Endemic to the Bonin (Ogasawara) Islands

• SUGAWARA TAKASHI

  Makino Herbarium, Graduate School of Science, Tokyo Metropolitan University

• WATANABE KENTA

  Makino Herbarium, Graduate School of Science, Tokyo Metropolitan University

• KATO HIDETOSHI

  Makino Herbarium, Graduate School of Science, Tokyo Metropolitan University

• YASUDA KEIKO

  Iriomote Project, Research Institute for Humanity and Nature

抄録

The sexual mode of Wikstroemia pseudoretusa, endemic to the Bonin (Ogasawara) Islands, was examined and compared with that of W. retusa, distributed widely in the Ryukyu Islands, Taiwan and the Philippine Islands. Although the two species have generally been regarded as hermaphroditic, we found that W. pseudoretusa was actually dioecious and W. retusa was hermaphroditic. In plants of W. pseudoretusa, male flowers usually produced functional pollen grains, and their gynoecium was vestigial and lacked ovules, while female flowers had a functional gynoecium, including an ovule, and their anthers were vestigial and completely lacked pollen grains. Based on the morphological properties of these species and on the occurrence of hermaphroditism in a closely related W. retusa, distributed on the continental islands, the Bonin W. pseudoretusa seems to be an example of dioecy evolving from hermaphroditism within the Islands.

収録刊行物

• Acta Phytotaxonomica et Geobotanica

  Acta Phytotaxonomica et Geobotanica 55 (1), 55-61, 2004

  日本植物分類学会

キーワード

• Bonin Islands
• dioecy
• oceanic islands
• Ogasawara
• pollen stainability
• Thymelaeaceae
• Wikstroemia pseudoretusa
• Wikstroemia retusa

詳細情報

• CRID: 1390001205270312192
• NII論文ID: 110006318319
• NII書誌ID: AA11586265
• DOI: 10.18942/apg.kj00004622804
• ISSN: 21897042
• ISSN: 13467565
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
  • Crossref
• 抄録ライセンスフラグ: 使用不可