A field experiment was conducted to determine the sensitivity of wheat to water stress and changes in morphological traits and yield of wheat (Triticum aestivum L.) under Water deficiency at the post anthesis Stage. The experiment comprised of three wheat cultivars i.e., Sivand, Marvdasht and DN-11 and two water stress treatments i.e., control (Irrigation in all stages of plant growth normally), water stress (post anthesis water deficiency with withholding of irrigation). The results depicted that grain yield, biomass, 1000 grain weight and number of grain per spike were reduced by 60.1%, 29.5%, 47.6% and 23.6% in water stress environment, respectively. Also, water stress caused reduction in morphological traits of both the wheat cultivars. The effect of drought on grain yield was primarily due to the significant reduction in grain weight, particularly in drought-sensitive Marvdasht cultivar. The highest and lowest peduncle and penultimate weight reduction due to water deficiency stress was observed in Sivand and DN-11 cultivars. In order to determinate the effect of post anthesis water deficiency on plants height, average height of all cultivars in both conditions were compared. Water deficiency stress reduced plant height from 43 to 38.9 cm that was about 9.5% decreases. The lowest reduction of plant height in post anthesis water deficiency stress was related to DN-11 cultivar and most reduction was related to Sivand and Marvdasht cultivars 14.9% and 10.5% respectively. Finally, it can be concluded that planting wheat DN-11 in the post anthesis water deficiency stress was recommended for maximizing grain yield under the environmental conditions.
کلید واژگان :Wheat, Grain yield, Water deficiency, Morphological traits, Dry matter, Spike
ارزش ریالی : 500000 ریال
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