Abstract
The narrowness of sweet corn genetic base limited to the great extent its genetic improvement. This is associated to the fact that sweet corn does not have well defined heterotic groups such as those important in field corn breeding, and therefore application of marker assisted selection becomes a necessity. The objective of this study was to determine genetic similarity (GS) of six sweet corn inbred lines selected at Maize Research Institute Zemun Polje, based on SSR markers and to compare it with data of specific combining ability (SCA) and heterosis for fresh ear yield, obtained in a diallel study. SSR markers showed that all genotypes had specific genetic pattern. Estimates of GS varied from 0.422 (L4 - L2) up to 0.756 (L6 - L5). Cluster analysis and PCA showed clear groupings of inbreds into two subclusters, with inbred L3 less related to the others. Results of diallel analysis showed that data of heterosis and SCA were in concurrence with the data of GS based on SSR markers. Hybrid combinations with higher estimates of SCA and heterosis expressed less genetic similarity with each other (such in hybrids L2 x L1; L6 x L2; L3 x L2 and L5 x L2), while inbreds that were genetically most similar L5 and L6 expressed low heterosis and SCA in their hybrid combination. That was confirmed by rank correlation coefficients, whose estimates were negative and in most cases significant, indicating that more similar inbreds produced less expressed effects of heterosis and SCA.
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Claims 6
Claim · model-written summary
SSR markers gave each genotype a specific genetic pattern.
Verbatim
e0“SSR markers showed that all genotypes had specific genetic pattern.”
t0“sweet corn”
Claim · model-written summary
Genetic similarity ranged from 0.422 for L4–L2 to 0.756 for L6–L5.
Verbatim
e0“Estimates of GS varied from 0.422 (L4 - L2) up to 0.756 (L6 - L5).”
t0“sweet corn”
Claim · model-written summary
Clustering and PCA separated the inbreds into two subclusters, with L3 less related to the others.
Verbatim
e0“Cluster analysis and PCA showed clear groupings of inbreds into two subclusters, with inbred L3 less related to the others.”
t0“sweet corn”
Claim · model-written summary
Hybrids with higher SCA and heterosis had lower parental genetic similarity.
Verbatim
e0“Hybrid combinations with higher estimates of SCA and heterosis expressed less genetic similarity with each other”
t0“sweet corn”
Claim · model-written summary
The most similar L5 and L6 inbreds had low heterosis and SCA in their hybrid.
Verbatim
e0“inbreds that were genetically most similar L5 and L6 expressed low heterosis and SCA in their hybrid combination”
t0“sweet corn”
Claim · model-written summary
Rank correlations between similarity and heterosis or SCA were negative and mostly significant.
Verbatim
e0“rank correlation coefficients, whose estimates were negative and in most cases significant, indicating that more similar inbreds produced less expressed effects of heterosis and SCA”
t0“sweet corn”