A Genetic Map and Germplasm Diversity Estimation of Mangifera indica (Mango) with SNPs

Mango (Mangifera indica) is often referred to as the “King of Fruits”.  As the first steps in developing a mango genomics project, we genotyped 582 individuals comprising six mapping populations with 1054 SNP markers.  The resulting consensus map had 20 linkage groups defined by 726 SNP markers with 67 SNPs as the maximum number for one linkage group and 20 SNPs the minimum number.  Although mango has been described as an allotetraploid with 40 chromosomes (n = 10), all SNPs showed disomic inheritance and Mendelian segregation patterns of a diploid with n = 20.  SNP markers (384) that were evenly distributed across the mango genome as defined by map position were used to genotype ~800 individuals including other Mangifera species from several germplasm collections in a first round of germplasm genetic diversity estimation.  Clustering and STRUCTURE analysis of the germplasm data will be presented.