Abstract
An experiment was conducted during Rabi 2012-13 at the Nuclear Institute of Agriculture (NIA), Tandojam, Pakistan to figure out yield potential of different wheat genotypes under water deficient condition. Twenty newly evolved genotypes through conventional breeding were tested for the effects of water stress on grain yield, yield associated and physiological traits in comparison to four local varieties (Sarsabz, Khirman, TD-1 and Chakwal-86). The experiment was laid out in split plot design with three replications. Analysis of variance showed highly significant differences among genotypes, treatments and genotype x treatment interaction for grains spike-1 , 1000 grain weight (g), grain yield plant-1 (g), harvest index, leaf area (cm2 ) and chlorophyll content. Spikelets spike1were non-significant in treatment but significantly differed in varieties and treatment x variety interaction. The biological yield was significantly different in treatments and varieties but non-significant in treatment x variety. Significant difference of harvest index was observed in genotypes but neither in treatments nor in treatment x variety interaction. Genotypes, treatments and their interaction showed non-significant differences for spike length. Average performance of genotypes with one and two irrigation(s) revealed that the lines IBWSN-078-1056 gave more grains spike-1 (66.3) and grain yield per plant (8.29 g). The maximum spike length, chlorophyll content, harvest index, biological yield, 1000 grain weight and leaf area was noted in IBWSN-078-1071, 1072, 1078, 1090, 1095 and 1098 respectively. Cultivar Khirman produced more number of spikelets spike-1 (23.1) among all genotypes.
