NDLI: Molecular phylogeny of Alnus (Betulaceae), inferred from nuclear ribosomal DNA ITS sequences

Content Provider	Springer Nature Link
Author	Navarro, Elisabeth Bousquet, Jean Moiroud, André Munive, Antonio Piou, Dominique rmand, Philippe
Copyright Year	2003
Abstract	The nuclear ITS region of 19 species of Alnus was amplified and sequenced. The inferred molecular phylogeny shows that all species of the genus Alnus form a monophyletic group close to Betula and that the fundamental dichotomy within the genus lies between the subgenera Alnaster and Gymnothyrsus, sensu Murai (1964). The subgenus Alnaster appears to be basal in the genus, based on archaism of morphological features, and branching close to the root of the trees due to low ITS divergence from genus Betula. The monophyly of the section Clethropsis is not supported by the present data: Alnus nepalensis is positioned in the subgenus Gymnothyrsus, away from A. nitida and A. maritima. Surprisingly, A. formosana sect. Japonicae is closely tied to A. maritima sect. Clethropsis, with which it shares few morphological traits, and is separate from A. japonica sect. Japonicae with which it shares many traits. An increase in substitution rate is noted in the group comprising A. formosana, A. maritima and A. nitida relative to the rest of the genus, which appears to have had, on the average, a very slow mutation rate. Alnus glutinosa, the designated type for the genus, appears to be representative of the genus both for morphological characters and evolutionary rate. North-East Asia is comforted in its position of origin of the genus since not only does it have the highest number of species and representatives in all deep branching lineages, there are also fewer transcontinental migrations when a North-East Asian ancestor is postulated than when a North American ancestor is postulated.
Starting Page	207
Ending Page	217
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	254
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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