Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 53 2 2022 06 22 Effect of water stress on yield, yield components and photoassimilates partitioning of barley cultivars (Hordeum vulgare L.) at reproductive stage Effect of water stress on yield, yield components and photoassimilates partitioning of barley cultivars (Hordeum vulgare L.) at reproductive stage 109 125 88232 10.22059/ijfcs.2021.320033.654808 FA Sakineh Abdi Ahar Faculty of Agriculture and Natural Resources, University of Tabriz, Iran 0000-0003-0509-7211 Journal Article 2021 03 09 In order to determine the effect of water stress on yield, yield components and phtoassimilate of barley at flowering stage, a a split-plot field experiment was carried out based on randomized complete blocks design with three replications during 2018-2019 growing season. Irrigation treatments included normal irrigation and irrigation up to the flowering stage was the main plots and barley cultivars (Sahand, Bahman, Makui and Valfajr) were subplots. The results showed that 1000-grain weight of cultivars decreased 21.45% under stress conditions by compared to normal irrigation. Makoei cultivar had the highest decrease in grain yield with 23.55% reduction compared to other cultivars. Bahman and Makoei cultivars had the highest biological yield reduction. The highest biological yield was observed in Bahman cultivar under normal irrigation conditions. Under stress condition, the rate of remobilization increased in all parts and internods of the stem and cultivars. All cultivars had differences in the rate of remobilization from different parts of the stem, so that in the case of Valfajr and Sahand cultivars, the rate of penultimate remobilization was higher than peduncle. Bahman and Makui cultivars had high remobilization rate from peduncle and lower stem internodes. The remobilization efficiency of different stem internods had significantly increased under stress condition and the highest contribution of peduncle remobilization was obtained by Sahand cultivar under water stress conditions. Therefore, baseb on the yield indices and rate of remobilization of photosynthetic materials, Bahman and Sahand were identified as suitable barley cultivars under normal irrigation and water stress conditions, respectively. In order to determine the effect of water stress on yield, yield components and phtoassimilate of barley at flowering stage, a a split-plot field experiment was carried out based on randomized complete blocks design with three replications during 2018-2019 growing season. Irrigation treatments included normal irrigation and irrigation up to the flowering stage was the main plots and barley cultivars (Sahand, Bahman, Makui and Valfajr) were subplots. The results showed that 1000-grain weight of cultivars decreased 21.45% under stress conditions by compared to normal irrigation. Makoei cultivar had the highest decrease in grain yield with 23.55% reduction compared to other cultivars. Bahman and Makoei cultivars had the highest biological yield reduction. The highest biological yield was observed in Bahman cultivar under normal irrigation conditions. Under stress condition, the rate of remobilization increased in all parts and internods of the stem and cultivars. All cultivars had differences in the rate of remobilization from different parts of the stem, so that in the case of Valfajr and Sahand cultivars, the rate of penultimate remobilization was higher than peduncle. Bahman and Makui cultivars had high remobilization rate from peduncle and lower stem internodes. The remobilization efficiency of different stem internods had significantly increased under stress condition and the highest contribution of peduncle remobilization was obtained by Sahand cultivar under water stress conditions. Therefore, baseb on the yield indices and rate of remobilization of photosynthetic materials, Bahman and Sahand were identified as suitable barley cultivars under normal irrigation and water stress conditions, respectively. https://ijfcs.ut.ac.ir/article_88232_5f173dc544ca977853ff56d2a56dd855.pdf