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Cytogenetic and phylogenetic studies in the genus Vernonia Schreb .
Author(s) -
Adegbite A. E.,
Ayodele M. S.
Publication year - 2004
Publication title -
feddes repertorium
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.24
H-Index - 25
eISSN - 1522-239X
pISSN - 0014-8962
DOI - 10.1002/fedr.200411050
Subject(s) - phylogenetic tree , biology , genus , chromosome , chromosome number , botany , phylogenetic relationship , evolutionary biology , genetics , zoology , karyotype , gene
Chromosome studies were carried out on some Nigerian species of Vernonia . Chromosome counts of n = 9 (2 n = 18) and n = 10 (2 n = 20) were recorded for the species considered. Hybridization, polyploidy and aneuploid decrease have been implicated as major mechanisms of evolution in the genus. Evidence from this work and previous studies have been invoked to suggest the evolution of the Vernonia species from closely related ancient species with basic chromosome number of x = 4 and x = 5. A phylogenetic chart of chromosome number evolution is proposed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)