Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2010.114.119SangtarashM.H. 32010133Environmental stress especially drought stress can play
an important role in the reduction of plant growth and development. In
order to study the effects of drought stress on different growth stages
of wheat, an experiment was conducted with five Iranian variety included
Atrak, Red-Seed, Cross-Flat, Hirmand and Darab. A split plot design was
used with drought treatment being the main plot and cultivar the subplot
with three replications. Poorest yield were when drought stress was applied
at flowering. It was shown that the most sensitive crop stage in terms
of the total number of spikelets is at early stem elongation. Onset of
the drought stress at flowering had the greatest damaging effect on seeds
per spikelet. The most damaging to seed size was drought stresses applied
at and just after flowering. Significant interactions occurred because
Darab the highest yielding cultivar and Red-Seed the lowest yielding cultivar
both showed an equal and great reduction in seed size under the drought
stress while Hirmand was much less responsive. Morphological characters
are likely to be affected by water stress. The results of this study indicate
that if water for irrigation is scarce and needs to be conserve any saving
should not be at the risk of causing drought stress around anthesis. Hirmand,
while not the highest yielding cultivar is more stable over the range
of moisture stresses applied and it could be considered as a parent to
combine its stability with the higher yield potential of say, Darab.]]>Chaves, M.M., J.S. Pereira, J. Maroco, M.L. Rodrigues and C.P.P. Ricardo et al.,200289907916Canny, M.J.,196035507532Ehdaie, B., J.G. Warnes and A.E. Hall,198828838842Evans, L.T., R.L. Dunstone, H.M. Rawson and R.F. Williams,197023743752Hafsi, M., W. Mechenneche, L. Bouamama, A. Djekoune, M. Zaharieva and P. Monneveux,2000185275280Henckel, P.A.,196415363386Jajarmi, V.,200949105106Lizana, C., M. Wentworth, J.P. Martinez, D. Villegas and R. Meneses et al.,200657685697Majer, P., L. Sass, T. Lelly, L. Cseuz, I. Vass, D. Dudits and J. Pauk,20085297100Mirbahar, A.A., G.S. Markhand, A.R. Mahar, S.A. Abro and N.A. Kanhar,2009Triticum aestivum) varieties.]]>4113031310Shabestary, M.M. and M. Mojtahedi,1989Akram, H.M., M.S. Iqbal, M. Saeed, A. Yar, A. Ali, K.A. Sahi and M.A. Nadeem,200479092Nagarajan, S., J. Rane, M. Maheswari and P.N. Gambhir,1999183129136Petinov, N.S.,1961168192Shahryari, R., E. Gurbanov, A. Gadimov and D. Hassanpanah,20081113301335Saini, H.S. and S. Lalonde,19981998pp: 223-248pp: 223-248Show, R.H. and W.C. Burrows,19661966pp: 122-142pp: 122-142Sial, M.A., M.U. Dahot, M.A. Arain, G.S. Markhand and S.M. Mangrio et al.,2009Triticum aestivum).]]>4117151728Singh, S.P.,20014116591675Turner, N.C. and M.M. Jones,19801980pp: 87-104pp: 87-104White, J.W., R. Ochaoa, F. Ibana and S.P. Singh,1994Phaseolus vulgaris) under semi arid rain fed condition.]]>122265273Sandha, B.S. and M.L. Horton,197769361364Mayaki, W.C., I.D. Teare and L.R. Stone, 1976169294Evans, L.T., I.F. Wardlaw and R.A. Fischer,19751975pp: 101-149pp: 101-149Jamieson, P.D., R.J. Martins and G.S. Francis,1995235566Jones, H.G. and J.E. Corlett,1992119291296Pirayvatlou, A.S.,20012001