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Molecular divergence between disjunct taxa in eastern Asia and eastern North America

Title
Molecular divergence between disjunct taxa in eastern Asia and eastern North America
Authors
Lee N.S.Sang T.Crawford D.J.Yeau S.H.Kim S.-C.
Ewha Authors
이남숙여성희
SCOPUS Author ID
이남숙scopus; 여성희scopus
Issue Date
1996
Journal Title
American Journal of Botany
ISSN
0002-9122JCR Link
Citation
American Journal of Botany vol. 83, no. 10, pp. 1373 - 1378
Indexed
SCI; SCIE; SCOPUS scopus
Document Type
Article
Abstract
Eastern Asian-eastern North American disjuncts in four genera were examined for allozyme divergence and sequence divergence of the internal transcribed spacers (ITS) of nuclear ribosomal DNA. The disjunct pairs of taxa include Caulophyllum robustum-C. thalictroides, Menispermum dauricum-M. canadense. Penthorum chinense-P. sedoides, and Phryma leptostachya var. asiatica-P. leptostachya var. leptostachya. Allozyme divergence was comparable in Caulophyllum and Penthorum (genetic identities of 0.534 anti 0.546) and was considerably higher than between pairs of taxa in Menispermum (0.273) and Phryma (0.291). Caulophyllum and Penthorum, which have the highest genetic identities at allozyme loci, also have low ITS sequence divergences (1.30 and 1.65%, respectively). Phryma, which has low isozyme identity, also has the highest ITS sequence divergence (4.46%). The two taxa of Menispermum have low ITS sequence divergence (0.93%) despite having a low identity (0.273) at allozyme loci. The results suggest that divergence between the taxa in the four genera are not the result of a single historical event. Estimated divergence times are reasonably consistent with a late Miocene disjunction for Caulophyllum and Penthorum, whereas the age of the Phryma disjunction is calculated at over 20 million years. The nonconcordant divergences between allozymes and ITS sequences in Menispermum may be caused by concerted evolution in the latter or possibly longer generation time in the woody plants. Additional molecular data are needed to clarify the situation.
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자연과학대학 > 생명과학전공 > Journal papers
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