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Rajendranagar, India

Jha S.K.,Vivekanand Parvatiya Krishi Anusandhan Sansthan | Singh N.K.,Vivekanand Parvatiya Krishi Anusandhan Sansthan | Singh N.K.,Govind Ballabh Pant University of Agriculture & Technology | Arun Kumar R.,Vivekanand Parvatiya Krishi Anusandhan Sansthan | And 5 more authors.
Indian Journal of Genetics and Plant Breeding | Year: 2013

An Additive main effect and multiplicative interaction (AMMI) model was used to analyze grain yield data of 21 single cross maize hybrids evaluated at four locations in north-western Himalayas.Variation among hybrids for grain yield was found to be significant in each location. AMMI analysis of variance indicated significant variance for locations, hybrids and hybrids×locations interaction (H×L). The location main effect had largest contribution (52.79 %) to the total sum of squares for grain yield followed by H×L interaction (28.16%) and hybrids (19.10%). The interaction component was further divided into interaction principal component axes (IPCA). Only first IPCA was found to be significant and accounted for 54.73% of the H×L variance. The second PCA was non-significant yet accounted for 26.16% variability of H×L interaction. The AMMI I analysis identified the nature and magnitude of interaction of each hybrids while AMMI II analysis identified the two hybrids namely, FH3594 and FH3609, which were moderately stable and promising across the north-western Himalayan environments.

Murali Krishna K.,Maize Research Center | Kulakarni N.,Maize Research Center | Sai Kumar R.,Maize Research Center
Indian Journal of Genetics and Plant Breeding | Year: 2013

The present investigation was undertaken to study the genetics of resistance for (PFSR) through generation mean analysis by using ten inbreds comprising six resistant and four susceptible lines, 45 possible F1 crosses, their corresponding F2, BC1 and BC2 progeny. The scaling test of A, B, C were significant indicating the role of epistatic effects, additive × additive, additive × dominance, dominance × dominance as well as non additive gene action governing the characters. In general, the magnitude of dominance was higher than additive effect indicating that PFSR resistance is largely governed by dominance effect. A breeding procedure which exploit both additive and dominance components, such as family selection with inter-mating, may be suitable for improvement of such crosses.The epistasis was of complimentary type in seven crosses and duplicate type in 38 crosses for PFSR.

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