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Evaluation of growth type and drought stress adaptation in Hordeum spontaneum L. ecotypes
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Abstract: (2862 Views) |
| This study aimed to evaluate the diversity and distribution of growth type in Hordeum spontaneum ecotypes and its relation with climate and drought adaptationsfor being used in barley breeding programs. Eighteen ecotypes of H. spontaneum from National Plant Gene Bank of Iran were evaluated in green house and field in 2011-12 cropping seasons. The green house study was the drought stress tolerance screening and the growth type of ecotypes was evaluated in the field. Both experiments were carried out in randomized complete block design with three replications. In the green house study the moisture condition was normal until spike emergence, then two different moisture regimes; well-watered (90-100% field capacity) and drought stress (20-30% field capacity) were applied. The field study consisted of evaluating vernalized and non-vernalized seeds. Assessment of growth type indicated that Desert and Cool Desert ecotypes had the growth type III, but Mediterranean and Cool Steppe ecotypes had IV and V growth type. A significant correlation was observed between stress tolerance index and growth type and ecotypes with lower vernalization requirements seemed to have better adaptability to drought stress conditions. Results indicated that wild barley originating from Desert and Cool Desert, with low vernalization requirement and early maturity, were more tolerant to drought stress, therefore, these valuable genetic resources can be used directly (gene transfer) and indirectly as parents in breeding programs for improvement of drought stress adaptation. |
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| Keywords: Barley, Climate, Drought stress, Ecotype and Growth type. |
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Full-Text [PDF 802 kb]
(1109 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2017/08/20 | Accepted: 2017/08/20 | Published: 2017/08/20
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