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Molecular and cytological evidences denied the immediate-hybrid hypothesis for Saxifraga yuparensis (sect. Bronchiales, Saxifragaceae) endemic to Mt. Yubari in Hokkaido, northern Japan

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Title: Molecular and cytological evidences denied the immediate-hybrid hypothesis for Saxifraga yuparensis (sect. Bronchiales, Saxifragaceae) endemic to Mt. Yubari in Hokkaido, northern Japan
Authors: Tamura, Saya Browse this author
Fukuda, Tomoko Browse this author
Pimenova, Elena A. Browse this author
Petrunenko, Ekaterina A. Browse this author
Krestov, Pavel V. Browse this author
Bondarchuk, Svetlana N. Browse this author
Chernyagina, Olga A. Browse this author
Suyama, Yoshihisa Browse this author
Tsunamoto, Yoshihiro Browse this author
Matsuo, Ayumu Browse this author
Tsuboi, Hayato Browse this author
Takahashi, Hideki Browse this author
Sato, Ken Browse this author
Nishikawa, Yoko Browse this author
Shimamura, Takashi Browse this author
Fujita, Hiroko Browse this author
Nakamura, Koh Browse this author →KAKEN DB
Keywords: Alpine plant
Bronchiales
diabasic plant
genome-wide SNP
hybrid
Japan
MIG-seq
Russia
Saxifraga
tetraploid
Issue Date: 23-Oct-2018
Publisher: Magnolia Press
Journal Title: Phytotaxa
Volume: 373
Issue: 1
Start Page: 53
End Page: 70
Publisher DOI: 10.11646/phytotaxa.373.1.2
Abstract: An alpine plant Saxifraga yuparensis is endemic to a scree consisting of greenschist of Mt. Yubari in Hokkaido, Japan and it has been proposed as an immediate hybrid derived from two species of the same section Bronchiales based on morphological intermediacy: namely S. nishidae, a diploid species endemic to a nearby cliff composed of greenschist and tetraploid S rebunshirensis comparatively broadly distributed in Japan and Russian Far East. Saxifraga yuparensis is red-listed and it is crucial for conservation planning to clarify whether this is an immediate hybrid and lacks a unique gene pool. The immediate-hybrid hypothesis was tested by molecular and cytological data. In nuclear ribosomal and chloroplast DNA trees based on maximum parsimony and Bayesian criteria, S. yuparensis and S. rebunshirensis formed a Glade with several other congeners while S. nishidae formed another distinct Glade. Genome-wide SNP data clearly separated these three species in principal coordinate space, placing S. yuparensis not in-between of S. rebunshirensis and S. nishidae. Chromosome observation indicated that S. yuparensis is tetraploid, not triploid directly derived from diploid-tetraploid crossing. Additionally, observation of herbarium specimens revealed that leaf apex shape of S. yuparensis fell within the variation of S. rebunshirensis. These results indicate that S. yuparensis is not an immediate hybrid of S. rebunshirensis and S. nishidae but a distinct lineage and an extremely narrow endemic species, that deserves for intensive conservation.
Rights: http://creativecommons.org/licenses/by/3.0
Type: article
URI: http://hdl.handle.net/2115/72152
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中村 剛

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