Studies on polyploid speciation in vascular plants and its evolutionary meanings on subtropical islands.

• Project/Area Number: 19570089
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: University of the Ryukyus
• Principal Investigator: DENDA Tetsuo University of the Ryukyus, 理学部, 准教授 (50284948)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 植物 / 進化 / 染色体 / 倍数性 / 琉球列島 / 雑種

Research Abstract

Hybrid and polyploid speciation within the Ryukyu Archipelago were analyzed based on morphological, cytological and molecular data. Studies on plant taxa such as the genus Ixeris (Compositae), Lonicera (Caprifoliaceae) and Hydrangea (Saxifragaceae) suggested an importance of such a speciation process to increase plant diversity within the closed insular environment.

Research Products

• [Journal Article] On the origin of the tetraploid Hydrangea liukiuensis(Saxifragaceae)from the Ryukyu Archipelago of Japan (2010)
  • Author(s): Denda T.
  • Journal Title: Raffles Bulletin of Zoology (In press)
  • Peer Reviewed
• [Journal Article] On the origin of the tetraploid Hydrangea liukiuensis (Saxifragaceae) from the Ryukyu Archipelago of Japan. (2009)
  • Author(s): Denda T
  • Journal Title: Raffles Bulletin of Zoology (in press)
  • Peer Reviewed
• [Journal Article] Geohistorical and current environmental influences on floristic differentiation in the Ryukyu Archipelago, Japan (2009)
  • Author(s): Nakamura K., Suwa R., Denda T., Yokota M.
  • Journal Title: Journal of Biogeography 36 Pages: 919-928
  • Peer Reviewed
• [Journal Article] On the origin of the tetraploid Hydrangea liukiuensis (Saxif ragaceae) from the Ryukyu Archipelago of Japan. (2009)
  • Author(s): Denda T.
  • Journal Title: Raffles Bulletin of Zoology (In press)
  • Peer Reviewed
• [Journal Article] 2007. Breakdown of distyly in a tetraploid variety of Ophiorrhiza japonica (Rubiaceae) and its phylogenetic analysis. (2007)
  • Author(s): Nakamura K., Denda T., Kameshima O., Yokota M.
  • Journal Title: Journal of Plant Research 120 Pages: 501-509
  • Peer Reviewed
• [Journal Article] Chromosomal studies of insular endemic Lonicera japonica Thunb. var. miyagusukiana Makino (Caprifoliaceae) in the Ryukyu Archipelago of Japan. (2007)
  • Author(s): Denda T., Kojya A., Yokota M.
  • Journal Title: Caryologia 60 Pages: 332-337
  • Peer Reviewed
• [Journal Article] Cytotaxonomical studies of the genus Ligustrum (Oleaceae) in the Ryukyus of Japan. (2007)
  • Author(s): Denda T., Watanabe K., Yokota M.
  • Journal Title: Chromosome Science 10 Pages: 37-41
  • NAID: 110006664186
  • Peer Reviewed
• [Journal Article] Cytotaxonomical studies of the genus Ligustrum (Oleaceae) in the Ryukyus of Japan. Chromosome Research (2007)
  • Author(s): Denda T., Watanabe K. and Yokota M.
  • Journal Title: Chromosome Science 10(In press)
  • Peer Reviewed
• [Journal Article] Chromosomal studies of insular endemic Lonicera japonica Thunb. var. miyagusukiana Makino (Caprifoliaceae) in the Ryukyu Archipelago of Japan (2007)
  • Author(s): Denda T., Kojya A. and Yokota M.
  • Journal Title: Caryologia 60(In press)
  • Peer Reviewed
• [Presentation] 琉球列島とオーストラリア東南部に隔離分布するコケタンポポ属 Solenogyne Cass.(キク科シオン連)の分子系統地理 (2010)
  • Author(s): 中村剛・傳田哲郎・國府方吾郎・Paul I.Forster・Gary Wilson・彰鏡毅・横田昌嗣
  • Organizer: 日本植物分類学会
  • Place of Presentation: 愛知県刈谷市(愛知教育大学)
• [Presentation] 琉球列島におけるヒサカキ属Euryaの起源と分化 (2009)
  • Author(s): 小林雅人, 傅田哲郎, 横田昌嗣
  • Organizer: 琉球大学21世紀COE成果報告会
  • Place of Presentation: 那覇, 沖縄
  • Year and Date: 2009-03-14
• [Presentation] 琉球列島産オオジシバリ(キク科)の形態解剖学的特性と海浜適応(Morphoanatomic characteristics and coastal adaptation of Ixeris debilis (Asteraceae) in the Ryukyu Arcipelago of Japan). (2008)
  • Author(s): 水野拓・傳田哲郎・横田昌嗣
  • Organizer: Annual report for 21st Century COE Program
  • Place of Presentation: University of the Ryukyus
  • Year and Date: 2008-03-01
• [Presentation] Incongruence between cpDNA- and nrDNA-based phylogenies suggests the allopoliploid origin of tetraploid Hydrangea liukiuensis (Saxifragaceae), an endemic shrub distributed on Okinawajima Island in the central Ryukyus. (2008)
  • Author(s): Denda T
  • Organizer: Annual report for 21st Century COE Program, University of the Ryukyus
  • Year and Date: 2008-03-01
• [Presentation] 沖縄県に生育するテンツキ属の形態と染色体数(Morphology and chromosome number of the genus Fimbristylis inhabiting Okinawa Prefecture). (2008)
  • Author(s): 杉山巳次・横田昌嗣・傳田哲郎
  • Organizer: Annual report for 21st Century COE Program
  • Place of Presentation: University of the Ryukyus
  • Year and Date: 2008-03-01
• [Presentation] ヤブランとコヤブラン(スズラン科ヤブラン属)の染色体数とcpDNAハプロタイプの地理的分布. (2008)
  • Author(s): 渡邊敬太・傳田哲郎・横田昌嗣
  • Organizer: 日本植物分類学会第7回大会
  • Place of Presentation: 南大沢
• [Presentation] 西表島で発見されたイワヒトデ属とヌカボシクハラン属の推定属間雑種について. (2008)
  • Author(s): 森重さやか・傳田哲郎・横田昌嗣
  • Organizer: 日本植物分類学会第7回大会
  • Place of Presentation: 南大沢
• [Presentation] Cytological diversity of the genus Hydrangea (Saxifragaceae) in the Ryukyu Archipelago, Japan-on the origin of the tetraploid Hydrangealiukiuensis endemic to Okinawajima Island (2007)
  • Author(s): Denda T.
  • Organizer: International workshop on tropical island biodiversity: across land and sea
  • Place of Presentation: Singapore
  • Year and Date: 2007-09-26