Genetic studies for seed traits in maize (Zea mays L.)
2004
Katna, G. | Singh, H. B. | Sharma, J. K., CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur (India). Department of Plant Breeding and Genetics
In a study of 66 single crosses derived from a 12 x 12 half diallel in maize involving three hybrid checks, both additive and dominance components were important with the predominance of dominance effects for all the seed tests and traits. Non allelic interactions were found for 100-seed weight, 100-seed volume, osmotic stress test, seed vigour index and field emergence as indicated by significance values of (1-b). Characters viz., 100-seed weight and 100-seed volume exhibiting significant regression coefficient values (b) coupled with significant values of (1-b), indicated the presence of probably complementary type of interactions. The positive and negative genes in the parents were distributed unequally for all the traits as was evident from the ratio H2/4H1 except for germination percentage where equal distribution of genes with positive and negative effects were noticed. Low heritability (15) was observed for 100-seed weight, accelerated aging test, osmotic stress test, germination percentage and seed vigour index. Medium heritability (15-30) was observed for 100-seed volume and field emergence.
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