African Journal of Plant Science
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Article Number - 8110DC040476


Vol.7(11), pp. 535-542 , November 2013
DOI: 10.5897/AJPS2013.1048
ISSN: 1996-0824



Full Length Research Paper

Chromosome numbers and karyotype in three species of the genus Vernonia Schreber in Southern Nigerian


Kemka-Evans, C. I.1* and Okoli, Bosa2




1Alvan Ikoku Federal College of Education Owerri, Imo State, Nigeria.

2Regional Centre for Bioresources and Biotechnology, Rivers State, Nigeria.


Email: kemkakate@yahoo.com






 Accepted: 26 August 2013  Published: 30 November 2013

Copyright © 2013 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Detailed cytological studies were carried out on three species of the genus Vernonianamely Vernonia amygdalina (bitter leaf and non-bitter leaf), Vernonia cinerea andVernonia conferta to ascertain their chromosome number. The taxa studied showed diploid number of chromosome for V. cinerea (2n = 18) and V. conferta (2n = 20) and tetraploid number for V. amygdalina (2n = 36). The karyotype show nine (9) pairs of submetacentric chromosomes in V. cinerea and 10 pairs of submetacentric chromosomes in V. conferta. The karyotype of V. amygdalina (bitter leaf) varied from that of V. amygalina (non-bitter) by being larger in size and with a pair of telocentric chromosome. The studies of the pollen fertility suggest that V. amygdalina is an amphidiploid.

 

Key words: Chromosome numbers, karyotype, polyploidy, Vernonia.

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APA (2013). Chromosome numbers and karyotype in three species of the genus Vernonia Schreber in Southern Nigerian. African Journal of Plant Science, 7(11), 535-542.
Chicago Kemka-Evans, C. I. and Okoli, Bosa. "Chromosome numbers and karyotype in three species of the genus Vernonia Schreber in Southern Nigerian." African Journal of Plant Science 7, no. 11 (2013): 535-542.
MLA Kemka-Evans, et al. "Chromosome numbers and karyotype in three species of the genus Vernonia Schreber in Southern Nigerian." African Journal of Plant Science 7.11 (2013): 535-542.
   
DOI 10.5897/AJPS2013.1048
URL http://academicjournals.org/journal/AJPS/article-abstract/8110DC040476

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