li^rtraliD, ..-...^:v,:nanihcight,spike length,grair'i/Sj"!,r,g:--!'-r:y!^:c.lp:2r.:,2nd 100-grair. weicht were studied in 15 Fi populations oKfrainpn1 f*orr» " * y A h?Jf-^:^l!cl fct :r. v.'hec*. The parents showed difference for gca depending on their genotype and environment. For sea the 15 fi 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 F2 except forgra ins/spike which was maximum at Ismailia. Data of graphic analysis of ¥2 showed variation in the dominance or recessive eenes in parents. This agreed with th*» r«a«:iilf«j of ^t^tiftic^l ^r.zl'/'is.ThcTC *.vcrc si^ific^nt y'.er.otj'pic ir.c ger.ctypic correlation coefficients uctnccn gioiii y iclu/piani ana the four other traits.
For quantitative traits, such as yield, the relative performance of genotypes often changes from one environment to another. Extensive testing is required to identify the genotypes that show maximum desirable interaction with the environment. Among those materials in a set being tested an ideal cultivar would be adapted to a wide range of conditions with above average yield over environments and below average variance across environments.
Singh ct si. [1] found that gca components were higher than sea in three environments for spike length and grains/spike, while for grain weight and grain yield/plant sea estimates were higher in F2. Yadav and Singh [2] found that in Fa generation, both gca x
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