Estimation of Some Genetic Parameters and Inter-Relationship of Grain Yield and Yield Related Attributes in Certain Exotic Lines of Wheat (Triticum aestivum L. )

To estimates the heritability, genetic advance and interrelationship of yield and yield related attribute in certain exotic lines of wheat introduced from ICARDA (International Center for Agriculture Research in Dry Areas), a field experiment was carried out in the research area of Plant Breeding and Genetic, PMAS, University of Arid Agricultural Rawalpindi during 2010-11. The research materials comprised of twenty three wheat genotypes including a local check variety (Chakwal 97) were planted in randomized completed block design with three replications.  Data were recorded and analyzed on plant height, days to maturity, No. of tillers m -2 , spike length, 1000 grain weight, and grain yield Kg/ha. The genotypes were highly significant for all the traits except for days to maturity where non significantly difference was observed. Maximum broad sense heritability was observed for grain yield per plot (93.34) while minimum value (7.82) was recorded for days to maturity. Value of genetic advance range from minimum 0.23 for days to maturity to maximum (589.49) for grain yield (Kg/ha) was assessed. Genotypic correlation coefficient was observed greater in magnitude has compared to phonotypic correlation coefficient in maximum character pairs. Phonotypic and genotypic correlation coefficient of grain yield with No. spikelets/spike, days to maturity, No. of tillers/m 2 and No. of grains/spike was observed positive and significant whereas plant height and spike length was found has deterrent traits for grain yield improvement because these characters showed negative association with grain yield. Keywords : Heritability, Genetic Advance, Phenotypic Correlation, Genotypic Correlation, Wheat