Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.1945.1948Triticum aestivum L.)]]>KhanAbdus SalamHabibImran 122003623In the present study graphic analysis was made for 5x5 diallel cross involving wheat varieties/lines viz., Tobari-66, SARC-1, 4943, 4072 and 4770 to determine genetic mechanism controlling some important yield components during crop season 2001-2002. Number of tillers per plant and grain weight per spike were governed by over-dominance type of gene action while plant height and peduncle length were controlled by partial dominance with additive type of gene action. Whereas, 1000-grain weight exhibited partial dominance type of gene action. Genotype Tobari-66 possessed maximum dominant genes for plant height and peduncle length and SARC-1 for number of tillers per plant. While genotype 4072 had maximum dominant genes for traits like grain weight per spike and 1000-grain weight. Epistasis was absent for all the above mentioned traits. For the traits like plant height, peduncle length and 1000-grain weight, selection in early generation will be fruitful whereas delayed selection should be preferred for the traits like number of tillers per plant and grain weight per spike.]]>Ali, Z., A.S. Khan and T.M. Khan,1999215611563Chaudhry, M.A., M.A. Chowdhry, M. Ahsan and I. Khaliq,20014977979Hayman, B.I.,195439789809Hayman, B.I., 1958436385Jinks, J.L.,1954Nicotiana rustica varieties.]]>39767788Kashif, M., J. Ahmad, M.A. Chowdhry and K. Perveen,2003Triticum durum Desf.).]]>2708712Khan, A.S., M.K.R. Khan and T.M. Khan,2000Triticum aestivum L.).]]>2129132Rahman, M.A., N.A. Siddquie, M.R. Alam, A.S.M.M.R. Khan and M.S. Alam,2003Triticum aestivum).]]>2277282Seitkhozhaev, A.I., G.I. Balan and S.S. H'lchev,19901990Steel, R.G.D. and J.H. Torrie,19802nd Edn.,Pages: 633Pages: 633Subhani, G.M. and M.A. Chowdhry,20003983987Jinks, J.L.,19559223238