Genetic background for adaptation to riparian environments in species of the genus Rhododendron

• Project/Area Number: 16K18714
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Chiba University
• Principal Investigator: Watanabe Yoichi 千葉大学, 大学院園芸学研究科, 助教 (30763651)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 平行進化 / 渓畔適応 / ゲノムワイド / MIG-seq / 進化生態学 / 集団遺伝学 / RNA-seq / 花期変異

Outline of Final Research Achievements

A popular horticulture plant, Rhododendron indicum is distributed along river in Kanto to Kinki districts and Yakushima Island of Japan in wild. By analysing evolutionary process of R. indicum, individuals in the two regions are not phylogenetically close, but close to R. kaempferi. It is suggested a possibility that R. indicum had been evolved from R. kaempferi at least twice. Its characteristic ecology may have been formed by natural selection due to riparian habitat, the species grows.

Academic Significance and Societal Importance of the Research Achievements

一般に種は１つのグループ（単系統）を形成すると期待されがちだが、実際にはこの期待に反する平行進化と呼ばれる進化を伴う種が多いことが認知されてきている。本研究で対象としたサツキもこの例であり、進化と分類の齟齬に一石を投じるものである。

また、サツキは園芸植物としてよく利用される種であるため、2系統を確認したことで育種や野生集団の保全に大きく貢献するものと考えられる。

Research Products

• [Journal Article] Phylogeographic analysis suggests two origins for the riparian azalea Rhododendron indicum (L.) Sweet. (2018)
  • Author(s): Yoichi W, Kawamata I, Matsuki Y, Suyama Y, Uehara K, Ito M
  • Journal Title: Heredity Volume: 印刷中 Issue: 6 Pages: 594-604
  • DOI: 10.1038/s41437-018-0064-3
  • Peer Reviewed
• [Journal Article] Contrasting diversification history between insular and continental species of three-leaved azaleas (Rhododendron sect. Brachycalyx) in East Asia (2017)
  • Author(s): Watanabe Yoichi, Xiao-Feng Jin, Ching-I Peng, Ichiro Tamaki and Nobuhiro Tomaru
  • Journal Title: Journal of Biogeography Volume: 印刷中 Issue: 5 Pages: 97-114
  • DOI: 10.1111/jbi.12924
  • Peer Reviewed / Open Access
• [Journal Article] Development and characterization of EST-SSR markers for the genus Rhododendron section Brachycalyx (Ericaceae) (2017)
  • Author(s): Watanabe Yoichi, Shota Sakaguchi, Saneyoshi Ueno, Nobuhiro Tomaru and Koichi Uehara
  • Journal Title: Plant Species Biology Volume: 印刷中 Issue: 4 Pages: 455-459
  • DOI: 10.1111/1442-1984.12155
  • Peer Reviewed
• [Journal Article] Inconsistency between morphological traits and ancestry of individuals in the hybrid zone between two Rhododendron japonoheptamerum varieties revealed by a genotyping-by-sequencing approach (2017)
  • Author(s): Ichiro Tamaki, Watanabe Yoichi, Yu Matsuki, Yoshihisa Suyama, Mizuo Mizuno
  • Journal Title: Tree Genetics & Genomes Volume: 13 Issue: 1 Pages: 4-4
  • DOI: 10.1007/s11295-016-1084-x
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Population demographic history of a temperate shrub, Rhododendron weyrichii (Ericaceae), on continental islands of Japan and South Korea (2016)
  • Author(s): Yoichi W, Tamaki I, Sakaguchi S, Song J-S, Yamamoto S-I, Tomaru N
  • Journal Title: Ecology and Evolution Volume: 6 Issue: 24 Pages: 8800-8810
  • DOI: 10.1002/ece3.2576
  • Peer Reviewed / Open Access
• [Presentation] ヤシャビシャクの富士山集団における著しい 遺伝的分化 (2019)
  • Author(s): 阪口翔太、高橋大樹、瀬戸口浩彰、山下由 美、沢和浩、田村淳、玉木一郎、渡辺洋一、 大石満、松尾歩、陶山佳久、井鷺裕司
  • Organizer: 第18 回日本植物分類学会大会
• [Presentation] Evolutionary history and demographic consequence of adaptive radiation for rice azaleas (Rhododendron tschonoskii alliances) (2018)
  • Author(s): Yoichi Watanabe, Atsushi J Nagano, Sang-Hun Oh, Koichi Uehara, Harue Abe
  • Organizer: 8th EAFES
  • Int'l Joint Research
• [Presentation] 類似分布を有する近縁ツツジ属2種の対照的な個体群動態史 (2018)
  • Author(s): 渡辺洋一、小野悦生、綱本良啓、陶山佳久、上原浩一
  • Organizer: 第129回日本森林学会大会
• [Presentation] 日本におけるイチョウ巨木の遺伝的変異の地域的特性 (2018)
  • Author(s): 片倉慶子、河上友宏、渡辺洋一、藤井英二郎、上原浩一
  • Organizer: 第129回日本森林学会大会
• [Presentation] 広義コメツツジ類の系統地理解析から明らかになった高山への適応 進化史 (2017)
  • Author(s): 渡辺洋一、永野惇、上原浩一、阿部晴恵
  • Organizer: 植物分類学会
  • Place of Presentation: 京都大学（京都府、京都市）
  • Year and Date: 2017-03-11
• [Presentation] Regional characteristics in genetic variation and introduction history of Ginkgo biloba, inferred using giant old trees in Japan (2017)
  • Author(s): Keiko Katakura, Tomohiro Kawakami, Watanabe Yoichi, Eijiro Fujii, Koichi Uehara
  • Organizer: XIX International Botanical Congress
  • Int'l Joint Research / Invited
• [Book] ツツジ・シャクナゲ ハンドブック (2018)
  • Author(s): 渡辺洋一、高橋 修
  • Total Pages: 108
  • Publisher: 文一総合出版
  • ISBN: 9784829981382
• [Book] ツツジ・シャクナゲハンドブック (2018)
  • Author(s): 渡辺洋一, 高橋修
  • Total Pages: 108
  • Publisher: 文一総合出版
  • ISBN: 9784829981382