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Title:Effects of Drought Stress on the Growth, Yield and Yield Components of Fourwheat Populations in Different Growth Stages Authors: Gholamreza Dalvandi; Askar Ghanbari-odivi; Amin Farnia; Behrouz Khaliltahmasebi; Ezzat Nabati DOI: Aff: Department of agriculture,Payame noor Univercity, I.R, of Iran 4. Student Of weed science, Birjand,
Iran5.agricultural Researches Manager of Borujerd, Iran. Author Email: Keywords: Wheat; Drought Stress; Different Growth Stages; Yield Components URLs:ABSTRACT-HTML | FULLTEXT-PDF | Abstract:To investigate the effects of drought stress on wheat, this experiment was conducted in 2010 at Doroud in Lorestan, Iran.The experiment was conducted in split plot in the form of a randomized complete block design with four replications. The main plots were irrigation (T1control, No water stress imposed and plots were never allowed to dry out, T2: Water stress imposed at anthesis stage, T3: Water stress was imposed at stem elongation stage, T4: Water stress was imposed at grain filling stage). The sub plots were fourwheat varieties (V1: WS82; V2;Sadr; V3:Bahar & V4: B2).The measured traits were harvest index, biological yield, number of spikes/m2, number of grains per of spike, 1000-grain weight, grain yield and plant height.Mean comparison was conducted using LSD range test (at 1% level). The results showed that drought stress had significant effect on harvest index, biological yield, number of spikes/m2, number of grains per of spike, 1000-grain weight, grain yield and plant height. Among populations B2harvest index, biological yield, number of spikes/m2, number of grains per of spike, 1000-grain weight, spike length, grain yield and plant height had more reduction than the two other populations in drought conditions, whereas WS82 was less affected.