Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 53 1 2022 03 21 Effect of gibberellic acid solution spraying on the source strength and stem storage of wheat cultivar Effect of gibberellic acid solution spraying on the source strength and stem storage of wheat cultivar 131 148 86894 10.22059/ijfcs.2020.298730.654693 FA Vida Kardgar Agronomy and Plant Breeding Department, College of Agriculture and Natural Resources, Tehran University, Iran. Ali Ahmadi Agronomy and Plant Breeding Department, College of Agriculture and Natural Resources, Tehran University, Iran. 0000-0003-0044-2645 Alireza Abbasi Agronomy and Plant Breeding Department, College of Agriculture and Natural Resources, Tehran University, Iran. 0000-0003-3598-0419 Journal Article 2020 03 06 This study has been conducted to recognize some of the physiological mechanisms related to the storage in different wheat cultivars as a split-plot experiment in a randomized complete blocks design with three replications at the experimental farm of Faculty of Agriculture and Natural Resources, University of Tehran, in Karaj, during two crop years of 2014-2016. Experimental treatments consisted of 22 wheat cultivars as the main plots and gibberellic acid (GA3) at two levels (0 mg/L (control) and 100 mg/L) as the sub plots. Results showed that gibberellic acid spraying significantly increased stem dry and specific weights, leaf area, chlorophyll and grain yield in different wheat cultivars in both experimental years. Among these traits, the shoot dry weight had the highest response to gibberellic acid spraying. There was also a significant positive correlation between stem dry and stem specific weights and remobilization in different cultivars under gibberellic acid spraying condition. Shabrang and Dez cultivars had the highest storage related traits (stem dry and specific weights) under gibberellic acid spraying condition which resulted in higher grain yield. These cultivars had the highest grain yield due to higher stem reserves remobilization capacity. In this study, exogenous application of gibberellic acid has generally strengthened the stem storage capacity, source strength and yield in different wheat cultivars. This study has been conducted to recognize some of the physiological mechanisms related to the storage in different wheat cultivars as a split-plot experiment in a randomized complete blocks design with three replications at the experimental farm of Faculty of Agriculture and Natural Resources, University of Tehran, in Karaj, during two crop years of 2014-2016. Experimental treatments consisted of 22 wheat cultivars as the main plots and gibberellic acid (GA3) at two levels (0 mg/L (control) and 100 mg/L) as the sub plots. Results showed that gibberellic acid spraying significantly increased stem dry and specific weights, leaf area, chlorophyll and grain yield in different wheat cultivars in both experimental years. Among these traits, the shoot dry weight had the highest response to gibberellic acid spraying. There was also a significant positive correlation between stem dry and stem specific weights and remobilization in different cultivars under gibberellic acid spraying condition. Shabrang and Dez cultivars had the highest storage related traits (stem dry and specific weights) under gibberellic acid spraying condition which resulted in higher grain yield. These cultivars had the highest grain yield due to higher stem reserves remobilization capacity. In this study, exogenous application of gibberellic acid has generally strengthened the stem storage capacity, source strength and yield in different wheat cultivars. https://ijfcs.ut.ac.ir/article_86894_ce530aa344a3d3feecdc6912fbc3f660.pdf