Molecular Characterization of Sixty Local Mango Germplasm of Chapainawabganj

Abstract

The experiment was conducted at Plant Genetic Resources Centre, Bangladesh Agricultural Research Institute (BARI) and the genotypes were collected from Chapainawabganj, the most mango variability rich district in Bangladesh. The molecular characters of mango germplasm were assessed by using six simple sequence repeat (SSR) markers. Polymerase chain reaction (PCR) amplification of the DNA isolated from 60 mango germplasm with 6 SSR primers was performed. The sizes of the alleles detected ranged from 112 to 221 bp. SSRs exhibited moderate values of polymorphic information content (PIC) range of 0.9405 to 0.6501. Genetic distances (D) between varieties were computed from combined data of the 6 primers, ranging from 0.5000 to 1.0000. Moderate degree of genetic diversity was obtained where the highest level of gene diversity value was noted 0.9433 in loci MIGA179 and the lowest level of gene diversity value was computed 0.6683 in loci MIGA253 with a mean diversity of 0.8842. The dendrogram generated from the unweighed pair group arithmetic average (UPGMA) cluster analysis broadly placed 60 mango cultivars into ten major clusters. The cluster size varied from 1 to 12 and cluster-VI was the largest cluster comprising of 9 cultivars. The tendency of clustering among mango cultivars revealed that they have strong affinity towards further breeding programme.