Premium
Karyotypic studies on species of Phaseolus (Fabaceae: Phaseolinae)
Author(s) -
MercadoRuaro Pedro,
DelgadoSalinas Alfonso
Publication year - 1998
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.2307/2446547
Subject(s) - biology , phaseolus , fabaceae , karyotype , chromosome , chromosome number , evolutionary biology , botany , zoology , genetics , gene
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 2 n = 20, whereas the rest of the species have 2 n = 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 .