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

Autor:	Shiotani Y; Division of Biosphere Science, Graduate School of Environment Science, Hokkaido University, Sapporo 060-0810, Japan., Fukuda T; College of Liberal Arts and Sciences, Mie University, Tsu 514-8507, Japan., Marchuk EA; Botanical Garden-Institute, Far Eastern Branch of the Russian Academy of Sciences, Makovskii Str. 142, Vladivostok, 690024, Russia., Petrunenko EA; Botanical Garden-Institute, Far Eastern Branch of the Russian Academy of Sciences, Makovskii Str. 142, Vladivostok, 690024, Russia., Krestov PV; Botanical Garden-Institute, Far Eastern Branch of the Russian Academy of Sciences, Makovskii Str. 142, Vladivostok, 690024, Russia., Bondarchuk SN; Sikhote-Alin State Nature Biosphere Reserve, Ministry of Nature Resources and Environment, Terney, 692150, Russia., Nishikawa Y; Institute of Environmental Sciences, Hokkaido Research Organization, Sapporo 060-0819, Japan., Shimamura T; Institute of Environmental Sciences, Hokkaido Research Organization, Sapporo 060-0819, Japan., Fujimura Y; Research & Development Center, Nippon Koei Co. Ltd., Tsukuba 300-1259, Japan., Nakamura K; Botanic Garden, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0003, Japan.
Jazyk:	angličtina
Zdroj:	PhytoKeys [PhytoKeys] 2020 Dec 23; Vol. 170, pp. 83-91. Date of Electronic Publication: 2020 Dec 23 (Print Publication: 2020).
DOI:	10.3897/phytokeys.170.58585
Abstrakt:	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 . (Yuki Shiotani, Tomoko Fukuda, Elena A. Marchuk, Ekaterina A. Petrunenko, Pavel V. Krestov, Svetlana N. Bondarchuk, Yoko Nishikawa, Takashi Shimamura, Yoshiyasu Fujimura, Koh Nakamura.)
Databáze:	MEDLINE
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