Indian Society of Genetics & Plant Breeding

Heterotic grouping of sweet corn (Zea mays var. sachharata) genotypes based on their combining ability and molecular diversity

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The present study was aimed at determining the genetic
diversity of 12 sweet corn inbred lines and to classify them
into heterotic groups on the basis of specific combining
ability (SCA) effects for grain yield, the heterotic groups
SCA and general combining ability (GCA) for grain yield
(HSGCA), heterotic grouping based on GCA of multiple
traits (HGCAMT) and SSR based genetic distance (GD).
Analysis of variance showed highly significant mean square
values for GCA and SCA for most of the traits studied. The
12 inbred lines were genotyped with 30 polymorphic simple
sequence repeat (SSR) markers which identified an average
of 2.53 alleles per loci. The average polymorphic information
content (PIC) and genetic diversity were recorded to be
0.40 and 0.49, respectively. The four heterotic grouping
methods classified the 12 inbred lines into three groups
showing a similar but not identical trend. Breeding
efficiencies of all the four heterotic groping methods
indicated that the SSR-GD method followed by HSGCA to
be more efficient in grouping of sweet corn inbred lines
into heterotic groups for further use in hybrid breeding
program.

Keywords: Sweet corn, genetic diversity, combining ability, heterotic pattern, microsatellite markers

Info

Year: 2021
Volume: 81
Issue: 3
Article DOI: 10.31742/IJGPB.81.3.8
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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