PJB-2008-268
IDENTIFICATION OF TRAITS IN BREAD WHEAT GENOTYPES (TRITICUM AESTIVUM L.) CONTRIBUTING TO GRAIN YIELD THROUGH CORRELATION AND PATH COEFFICIENT ANALYSIS
TILA MOHAMMAD, MUHAMMAD AMIN*, FAZAL-E-SUBHAN, MUHAMMAD IRFAQ KHAN AND ABDUL JABBAR KHAN
Abstract
The association among yield components and their direct and indirect influence on the grain yield (GY) of bread wheat were investigated in 144 advance lines tested in partially balance lattice design during 2002-03. Analysis of variance for individual plant characters revealed the existence of genetic variability among the genotypes for all the characters studied. Genotypic correlation of plant height (PH), biological yield (BY), harvest index (HI), thousand kernel weight (TKW), number of spikes/m2 and hectoliter weight (HLW) were positive and significantly correlated with grain yield (GY) under normal and late planting respectively. However, non-significant correlations were observed for BY and TKW in genotypes planted late. Phenotypic correlation revealed that PH, BY, HI, TKW, number of spikes/m2 and HLW were also positive and significantly associated with GY under normal and late planting respectively. Strong positive and highly significant correlations of GY were detected with HI, BY and HLW under normal planting while in late planted genotypes HI showed strong positive and highly significant association with grain yield. Path coefficient analysis revealed that HI and BY had the highest positive direct effect on GY under both normal and late planting. In addition, some other yield components had positive direct effect on grain yield. According to the magnitude of the direct effects on GY, the order of various characters was DH > TKW > DM. The increase in GY can be achieved, if the selection is based on HI, BY and HLW under both normal and late planting.
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