Karyotypic studies on species of Phaseolus (Fabaceae: Phaseolinae)
1998
Mercado-Ruaro, P. | Delgado-Salinas, A.
Ten karyotypes of Phaseolus were analyzed. Possible directions of karyological evolution of those species are suggested. All species studied have karyotypes composed exclusively of metacentric and submetacentric chromosomes, except P. filiformis with all metacentrics, and P. chiapasanus with one pair of subtelocentric chromosomes. Secondary constrictions and satellites are common among species studied. Phaseolus leptostachyus, P. micranthus, and P. macvaughii are considered as aneuploids with 2n= 20, whereas the rest of the species have 2n = 22. We include a comprehensive list with information on chromosome counts gathered from other studies, using chromosomal indices, combined with our earlier counts and present findings. We provide recounts of all studied species and a first chromosome count of P. macvaughii.
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