Karyological studies of vicia articulata hornem

This study reported a new counting of chromosomes number and karyotypes of ten introduced accessions of v. articulata. this forage species,native of the mediterranean area,is widespread in south europe,west asia and australia. results showed that all accessions are diploid with a somatic chromosome numbers equal to 14. furthermore,four karyotypic formulas were found among the studied accessions: 2sm+1ms+4st for accessions va-38; va-2 and va-4; 1m+1ms+1sm+4st for accessions va-57 and va-91; 1m+1ms+1sm +2st+2t for accessions va-75 and va-66 and 2m+1ms+4st for accessions va-85,va-67 and va-103. there was a predominance of subtelocentric pairs compared to metacentric and submetacentric pairs. karyomorphological parameters based on rec index (ratio between the length of each chromosome and the length of the longest one),syi index (ratio between the average length of the short arms and the average length of the long arms) and tf% (ratio between the sum of the lengths of the short arms of individual chromosome and the total length of the complement) have been determined. they evidenced that the karyotype of accession va-2 was the most asymmetric one having the lowest value of syi index (27.95). cluster analysis using thirteen karyological parameters has been carried out. the corresponding dendrogram based on euclidian distance showed two main groups of accessions. accession va-2 is the farthest one and had the most karyotype in evolutionary trend. © 2015,university of agriculture. all rights reserved.