Abstract
The stomatal and chlorophyll effects were determined on yield and its contributing traits of wheat cultivars (Damani, Hashim-8, Gomal-8, DN-73, Zam-04 and Dera-98) under stress conditions at booting and after anthesis stages during 2009 at the University of Reading, UK. Significant water stress effects were observed on chlorophyll fluorescence, chlorophyll content, stomatal conductance, leaf area, relative water content (RWC %) and grain yield per plant. All the cultivars behaved independently and significantly different for physiological and yield traits. Cultivars Hashim-8, Zam-04 and Damani were observed as best candidate genotypes for rain-fed regions, and minimum effect and percent reduction was recorded at their booting and after anthesis stages for all traits at stress conditions. These rain-fed cultivars were also persistent at higher level of stomatal conductance and RWC % even under water stress condition, which reflects their adaptability under drought environment.