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BRAZILIAN SPECIES OF VIGUIERA (ASTERACEAE) EXHIBITLOW LEVELS OF ITS SEQUENCE VARIATION

Published online by Cambridge University Press:  11 December 2003

E. E. SCHILLING ,
F. B. DA COSTA ,
N. P. LOPES  and
P. J. HEISE
E. E. SCHILLING
Affiliation:
Department of Botany, University of Tennessee, Knoxville, TN 37996, USA
F. B. DA COSTA
Affiliation:
Universidade de São Paulo, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Av. do Café s/n, 14040–903, Ribeirão Preto, São Paulo, Brazil
N. P. LOPES
Affiliation:
Universidade de São Paulo, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Av. do Café s/n, 14040–903, Ribeirão Preto, São Paulo, Brazil
P. J. HEISE
Affiliation:
Department of Botany, University of Tennessee, Knoxville, TN 37996, USA
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Abstract

The internal transcribed spacer (ITS) region of the nuclear ribosomal DNA was sequenced from 21 accessions of Viguiera from South America, including 14 from Brazil. Overall there was only a small amount of sequence variation, less than 3.4% among South American samples and less than 4.5% between the South American samples and the Mexican V. flava. Phylogenetic analysis revealed little divergence among the Brazilian samples of Viguiera. The low level of ITS sequence variation was in striking contrast to the taxonomic diversity and chemical variability that have been reported for Viguiera in Brazil. The low level of sequence variation suggests that, despite its clear morphological and phytochemical adaptations to the cerrado, Viguiera is probably a relatively recent addition (less than 3 million years) to the flora of this area.

Keywords

AsteraceaecerradoITSmolecular phylogenyViguiera
Type
Research Article
Information
Edinburgh Journal of Botany , Volume 57 , Issue 3 , November 2000 , pp. 323 - 332
Copyright
© 2000 Trustees of the Royal Botanic Garden, Edinburgh

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