Affiliation:
1. University of Port Harcourt Department of Botany Port Harcourt Nigeria
Abstract
SummaryThe mitotic chromosomes of five West African species of Solanum are described for the first time. S. melongena, S. indicum, S. torvum and S. aethiopicum are all diploids with 2n = 24. S. nigrum is tetraploid with 4 × = 48 and hexaploid with 6 × = 71 Karyotypic studies show that marked interspecific differences exist in chromosome sizes while within the genome of each species continuous variation in size exists. The occurrence of imperfect homology of some chromosome pairs support the view that hybridisation and structural chromosomal changes have played some part in the evolution of S. melongena. The interspecific variation in sizes of chromosomes as well as the presence of conspicuous satellites in the genomes of S. melongena could be exploited for taxonomic purposes.
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