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Merger of Betula tatewakiana (Betulaceae) from northern Japan with northeast Asian B. ovalifolia based on ploidy level

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Title: Merger of Betula tatewakiana (Betulaceae) from northern Japan with northeast Asian B. ovalifolia based on ploidy level
Authors: Shiotani, Yuki Browse this author
Fukuda, Tomoko Browse this author
Marchuk, Elena A. Browse this author
Petrunenko, Ekaterina A. Browse this author
Krestov, Pavel V. Browse this author
Bondarchuk, Svetlana N. Browse this author
Nishikawa, Yoko Browse this author
Shimamura, Takashi Browse this author
Fujimura, Yoshiyasu Browse this author
Nakamura, Koh Browse this author →KAKEN DB
Keywords: Betula
chromosome number
dwarf birch
endangered species
Russian Far East
Issue Date: 23-Dec-2020
Publisher: Pensoft Publishers
Journal Title: Phytokeys
Volume: 170
Start Page: 83
End Page: 91
Publisher DOI: 10.3897/phytokeys.170.58585
Abstract: It has been controversial whether Betula tatewakiana, a dwarf birch distributed in Hokkaido of northern Japan, is an endemic species or a synonym of B. ovalifolia broadly distributed in northeast Asia. The endemic hypothesis is based on the idea that B. tatewakiana is diploid while B. ovalifolia is tetraploid and that they are separated based on the ploidy level; however, no chromosome data have actually been published before. Resolving the taxonomic problem is crucial also in judging the conservation priority of B. tatewakiana in a global perspective. Our chromosome observation revealed that B. tatewakiana is tetraploid as well as B. ovalifolia. We also conducted morphological observations and clarified that B. tatewakiana is morphologically identical to B. ovalifolia in white hairs and dense resinous glands respectively on adaxial and abaxial leaf surfaces, in which they differ from closely related species in the same section Fruticosae. We conclude that the hypothesis that B. tatewakiana is a Hokkaido endemic based on the ploidy level is not supported and that B. tatewakiana should be merged with B. ovalifolia.
Type: article
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)

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