components of different genotypes of grain of bread wheat

Drought tension is one of the most important determinants of crop production, therefore, this study aimed to investigate the effect of drought tension on wheat genotypes, as a completely randomized factorial statistically design was conducted under greenhouse conditions. The experimental treatments has consisted of three levels of drought tension (85, 60 and 35 percent of field capacity) and eight genotypes of wheat (Omid, Zarea, Mihan, ZSZOBKAYKA, JS3l7G217, Solh, G13CA2242O4P, and FAA3P4FCCC). The results indicated that there was significant difference between wheat genotypes in terms of remobilization of dry matter from the stem, leaf, peduncle, the whole plant and spike. Also, the efficiency of the remobilized dry matter of shoot, leaf and total and proportion of transferred dry matter from stem and total, was significant. Zare genotype was allocated the highest dry matter transferred of stem and leaves. Omid and JS3l7G217 genotypes had the highest efficiency of dry matter transferred from stem and Omid and Zare genotypes had the highest efficiency of dry matter transferred from peduncle.The highest proportion of transferred dry matter of leaf to seed was observed of genotypes Zarea and G13CA2242O4P. Also, wheat genotypes had significant differences in terms of plant height, peduncle length, number of grain per spike, one-thousand grain weight, and grain yield and harvest index. The highest plant height was allocated to genotypes Solh, Mihan and JS3l7G217 and the maximum spike length was belonged to genotypes FAA3P4FCCC and ZSZOBKAYKA under 85% field capacity. The highest and lowest one-thousand seed weight were obtained from genotypes Solh and JS3l7G217, respectively. Genotype ZSZOBKAYKA by producing 1.53 gram grain per plant under 85% field capacity and JS3l7G217 genotype by 0.39 gram per plant under 35% field capacity devoted the highest and lowest grain yield.