Indian Society of Genetics & Plant Breeding

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GENETIC ANALYSIS OF DIALLEL CROSS IN BREADWHEAT UNDER DIFFERENT ENVIRONMENTAL CONDITIONS IN EGYPT. 2. F2 AND PARENTS

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Five traits, namely, plant height, spike length, grains/spike, grain yield/plant, and l00-grain
weight were studied in 15 Fz populations obtained from a 6 X 6 half-diallel set in wheat.
The parents showed difference for gca depending on their genotype and environment. For
sea the 15 Fz populations differed from location to location. All the traits were influenced
by additive as well as dominance gene effects. Unequal allele frequency was observed in
the parents with asymmetrical distribution among these parents for the proportion of
positive and negative alleles with an excess of dominant over recessive genes. Some traits
showed partial dominance, others showed overdominance depending on location. Narrow
sense heritability was low for all the traits in Fz exceptfor grains/spike which was maximum
at Ismailia. Data of graphic analysis of Fz showed variation in the dominance or recessive
genes in parents. This agreed with the results of statistical analysis. There were significant
phenotypic and genotypic correlation coefficients between grain yield/plant and the four
other traits.
 

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Year: 1996
Volume: 56
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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