Abstract
A field experiment was conducted using five most-planted barley (Hordeum vulgare L.) cultivars in Jordan — a country with 90% of its total land area receiving an annual rainfall of less than 200 mm. The objective of this study was to determine the response of these five cultivars evaluated under drought-stressed (DS) and non-stressed (NS) environments and to investigate polymorphism of 10 candidate genes for drought response. Drought susceptibility index (DSI) was used to rank cultivars according to their performance. Biological and grain yield for all cultivars was lower in DS compared with NS. Reduction in biological yield caused by drought stress ranged from 19% for ‘Mutah’ to 45% for ‘Rum’ cultivar. The least affected by drought stress was ‘Mutah’ with 13% percent reduction (PR) in grain yield. DSI for grain yield ranged from 0.33 for ‘Mutah’ to 1.41 for ‘Rum’. Depending on PR and DSI for biological and grain yield, ‘Mutah’ was the most tolerant cultivar. However, no clear differences were detected am...
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