Genetic variability, heterosis, character correlation and path analysis of yieldcomponents in wheat (Triticum aestivum L. EMP. Thell)
2005
Mahmood, Q. | Qureshi, A.S. | Khan, M.R.,Quaid-i-Azam Univ., Islamabad(Pakistan). Dept. of Biological Sciences
Studies were conducted on six commercial cultivars of wheat viz.; Inqilab,Khyber 87, Soghat, Sarsabz, Rohtas 90 and Pak 81 and their three F, hybrids;Khyber 87 x Inqilab, Rohtas 90 x Pak 81, and Soghat x Sarsabz. The experimentwas conducted at National Seed Registration Department (NSRD), Rawalpindi,Pakistan during 1996/97. Data on various agronomical traits were taken andanalyzed for heterosis, correlation and path co-efficient studies. Analysis ofvariance revealed significant amount of genetic variability for all the characters.Significant heterosis for grain yield, biomass, plant height, flag leaf area, spikelength, spikelets per spike and 1000-seed weight except harvest index wasrecorded in F1 for all the three crosses. In general more correlation coefficientwas recorded at the genetic level as compared to phenotypic correlationcoefficients. Positive and significant correlation of grain yield was recorded withplant height, spike length and biological yield at the genotypic level. However,correlation between grain yield and 1000-seed weight was negative and highlysignificant. Biomass had maximum direct contribution to grain yield followed byplant height and 1000-seed weight while spike length and flag leaf area hadnegative direct contribution to grain yield. Therefore, these characters shouldreceive maximum attention while selecting high- yielding wheat breeds.
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