Five drought measurements. i.e. stomata! resistance (SR). transpiration rate (TI?),
leaf temperature (LT). relative waler content (RWC) and Potassium content (K) were
estimated for seven parental varieties and their hybrid under 40% and 60%
depletion of the available soil moisture. Irrigation mean squares were highly
sign (ticant for all the studied traits, except for TR and R WC, mean values of stress
condition for all drought measurements were higher than those of normal irrigation.
Mean squares for genotypes. parents. crosses and parent vs. crosses were significant
for all traits in both environments as well as the combined analysis, except parents’
mean square for LT in stress condition, parent vs. crosses for SR in the combined
analysis and TI?. LT and RWC in stress condition
The variety ،CARDA 3 expressed significant positive effects for SR, RWC and
r in the normal irrigation as well as the combined analysis. Also, it seemed to be the
best combiner for LT in both irrigation as well as the combined analysis. The parent
variety Sakha 93 seemed to be the best general combiner for TR in the stress
irrigation and the combined analysis. It could be considered as an excellent parent in
breeding programs towards releasing varieties characterized by low TR.
The most desirable Sij effects were recorded by the crosses Sham 6 x L 606. ،CARDA
3 s Giza ،68 and Sham 6 x Gemmiza 7for SR. Gemmi:a 7 x L 606. Giza 168 s Sakha
93 and Sham 6 x ،CARDA 3for TR, Sakha 93 s L 606, ،CARDA 3 x emmiza 7 and
Sham 6 x Gi:a ،68 for RWC in both irrigation treatments as well as the combined
analysis and Yacora Rojo x L606 under stress irrigation treatment for LT and Sakha
93 x L 606 and Gemmi:a 7 x L606 for K’ under stress and the combined data.
Key words: Wl,eai. droughi stress. heterosis. combining abiliry. dsalkl cross.es |
