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Sweet corn has recently experienced sharp rise in demand worldwide. Recessive sugary1 ( su1 ) and shrunken2 ( sh2 ) that enhances kernel sweetness have been abundantly used in sweet corn breeding. Analyses of genetic diversity among sweet corn inbreds assume great significance for their effective utilization in hybrid breeding. A set of 48 diverse sweet corn genotypes encompassing su1su1 , sh2sh2 and su1su1/sh2sh2 types were analyzed using 56 microsatellite markers. A total of 213 alleles with mean of 3.8 alleles per locus were generated. Two unique- and 12 rare- alleles were identified. The average PIC and genetic dissimilarity was 0.50 and 0.73, respectively. Cluster analysis grouped the inbreds into three major clusters, with each of the su1su1 -, sh2sh2 - and su1su1/sh2sh2 -types were broadly clustered together. Principal coordinate analyses also depicted the diverse origin of the genotypes. The study identified inbreds for synthesis of pools and pedigree populations to develop novel inbreds. The study led to the identification of prospective heterotic combinations in various genetic backgrounds ( sh2sh2  ×  sh2sh2, su1su1  ×  su1su1, su1su1/sh2sh2  ×  su1su1/sh2sh2, sh2sh2  ×  su1su1/sh2sh2 and su1su1  ×  su1su1/sh2sh2 ).

physiology and molecular biology of plants/physiology and molecular biology of plants

Microsatellite-based genetic diversity analyses of sugary1-, shrunken2- and double mutant- sweet corn inbreds for their utilization in breeding programme