Abstract
A study of genetic variation among 10 pairs of chromosomes extracted from 13 tropical sweet corn inbred lines, using 99 microsatellite markers, revealed a wide range of genetic diversity. Allelic richness and the number of effective alleles per chromosome ranged from 2.78 to 4.33 and 1.96 to 3.47, respectively, with respective mean values of 3.62 and 2.73. According to the Shannon’s information index (I) and Nei’s gene diversity coefficient (Nei), Chromosome 10 was the most informative chromosome (I = 1.311 and Nei = 0.703), while Chromosome 2 possessed the least (I = 0.762 and Nei = 0.456). Based on linkage disequilibrium (LD) measurements for loci less than 50 cM apart on the same chromosome, all loci on Chromosomes 1, 6 and 7 were in equilibrium. Even so, there was a high proportion of genetic variation in Chromosomes 4, 5, 8, 9 and 10, thereby revealing their appropriateness for use in the genetic diversity investigations among tropical sweet corn lines. Chromosome 4, with the highest number of loci in linkage disequilibrium, was considered the best for marker-phenotype association and QTL mapping, followed by Chromosomes 5, 8, 9 and 10.
Highlights
IntroductionSaccharata, 2n = 20), with a thin pericarp layer on the caryopsis, is consumed at the immature grain-stage of endosperm development
Sweet corn (Zea mays L. ssp. saccharata, 2n = 20), with a thin pericarp layer on the caryopsis, is consumed at the immature grain-stage of endosperm development
There was a wide range of genetic variation among the 10 pairs of chromosomes obtained from the inbred lines evaluated
Summary
Saccharata, 2n = 20), with a thin pericarp layer on the caryopsis, is consumed at the immature grain-stage of endosperm development It can be grown in a wide range of environments, so long as its water requirements are in accordance (Kashiani et al, 2011). The study of variation among chromosomes, besides being a quick way of detecting genes linked to molecular markers, makes it easy to define the degree of genetic relationships among inbred lines. The use of these molecular markers in the breeding process facilitates efficiently reaching breeding goals, with less reliance on field assaying by inoculation. Microsatellites, known as SSRs, short tandem repeats (STRs), and se-
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