Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2003.382.385TajammalM. Ashraf SharifAfsari JamilTayyab 4200364For this study ten genotypes of spring wheat (Triticum
aestivum L.) developed at three different breeding institutes were
evaluated for two year at nine locations in Pakistan and Azad Jammu and
Kashmir. Genotypes x location, genotype x year and genotype x location
x year interactions were found highly significant (P<0.01) for number
of grains per spike, grain protein % and grain yield. Relative magnitude
of interaction variance components viz., 2gl, 2gy
and 2gly reflected that relative performance of
genotypes for grain protein percentage and grain yield was more inconsistent
across the locations than years and opposite was true for number of grains
per spike. Correlation amongst these characters showed positive association
of number of grains per spike with grain yield, whereas grain protein
percentage indicated negative associated with number grains per spike
and grain yield under certain environments, however effect was inconsistent.
It revealed that under appropriate agro-ecological conditions, concurrent
selection for high grain yield based on number of grains per spike is
possible, whereas increase in yield may reduce grain protein percentage.
The results suggest that for breeding superior varieties, effect of environmental
factors such as temperature, precipitation ans soil fertility and their
interactions on the development of these characters and their relationships
should be considered greatly in breeding programmes.]]>Breese, E.L.,1969242744Busch, R.H., W.C. Shuey and R.C. Frohber,1969Triticum aestivum L.) to environments in relation to six quality characteristics.]]>9813817Camargo, C.E.O.,1987467389Campana, L.E. and M.E. Sempe,1984607989Eberhart, S.A. and W.A. Russell, 196663640Faris, M.A., M.R.A. de Araujo and M.A. de Lira,198121132134Finlay, K.W. and G.N. Wilkinson,196314742754Jinks, J.L. and J.M. Perkins,197025475480Johnson, H.W., H.F. Robinson and R.E. Comstock,195547314318Johnson, V.A., J.W. Schmidt and W. Mehaska,199658438441Levy, A.A. and M. Feldman,1989Triticum turgidum var. dicoccoides.]]>41113122Li, B.F.,19891147Mahmood, A. and M. Shahid,199314121125Mather, K.,19491st Edn.,Mikheev, L.A.,199218183190Millet, E., Y. Avivi, M. Zaccai and M. Feldman,198830473478McNeal, F.H., M.A. Berg, V.R. Stewart and D.E. Baldrigde,1972Triticum aestivum L. compared at different yield levels.]]>64362364McNeal, F.H. and D.J. Davis,196658635636Pepe, J.F. and R.E. Heiner,197515793797Saeed, M. and C.A. Francis,1984241316Wells, W.C.,19844510861086Yates, F. and W.G. Cochran,193828556580Gomez, K.A. and A.A. Gomez,19872nd Edn.,