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University of Mohaghegh Ardabili, Ardabil, Iran
Abstract:   (22 Views)
­­Drought is one of the most destructive abiotic stresses in all over the world that affects and limits the growth, development and final yield of crops. Based on the importance of this subject the reactions of thirteen rainfed spring 2-row barley genotypes and cultivars of cold areas of Iran to water stress were evaluated based on phonological, physiological and morphological traits. The experiment was carried out as factorial experiment in a randomized complete block design with three replications under three irrigation treatments (normal irrigation and irrigation based on the 60% and 80% available soil water depletion). The water stress was exerted two weeks before flowering. The results of mean comparisons showed that all the studied traits were reduced with increasing the level of water stress except branching of roots, root length and root length to plant height ratio. Taken together, based on the all of the analysis, we able to identify four drought tolerant genotypes (71938, 72566-1, Abidar cultivar and Dayton/ Ranney cultivar) which produced the highest yield under normal irrigation and both water stress conditions. Also, 71704 genotype could tolerate first water stress level (based on the 60% available soil water depletion) but not second stress level (based on the 80% available soil water depletion) and Denmark cultivar didn’t produce favorable yield in normal condition but was comparatively tolerant to both water stress levels. So, after doing competition tests under water stress in actual rainfed condition in cold-dry and semi-dry land, these genotypes can be recommended for cultivation in these areas, and also can be used for improvement of drought tolerant genotypes in breeding programs.
 
     
Type of Study: Research | Subject: Special

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