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Assessment of genetic gain in interspecific crosses of Carthamus genus using drought stress tolerance index combined with single plant selection
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Fariba Shafiei-Koij   , Aghafakhr Mirlohi , Mohammad Mahdi Majidi , Ghodrat alah Saeidi , Mohammad Badpar , Ghasem Veisi |
| Professor, Isfahan University of Technology, Isfahan, Iran |
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Abstract: (2566 Views) |
| Wild relatives of safflower are considered a useful source of desirable genes to develop improved cultivars for important agronomic and physiologic traits such as drought and salinity tolerance as well as increasing seed yield. Among wild species, cross compatible species are highlighted to obtain high genetic gain in next generations. In the present study, Carthamus tinctorius, C. palaestinus and C. oxyacanthus were crossed with each other and three segregating populations were developed. Single plant selection (SPS) and stress tolerance index (STI) were jointly employed in F4 and F5 generations for these three populations. Genetic gain was obtained under both water stress and non-stress conditions for several traits including seed yield. Genotypes from A and D groups of the three-D plots in F4 generation were repeated exactly in the same groups in the three-D plots of F5 generation indicating a very high selection efficiency. Response to selection in different interspecific populations under water stress and non-stress conditions identified suitable criteria for improving seed yield. High response to selection plus high broad sense heritability for several traits indicated the contribution of genetic variation more than environmental factors. Number of seed per capitulum, capitulum diameter, capitulum weight, 100-seed weight and number of branches had high narrow-sense heritability, and could be suggested as important and key traits for safflower breeding programs in water limited conditions. It is concluded that combining STI with SPS method in safflower interspecific breeding may efficiently identify superior genotypes in the early segregating generations under water stress and non-stress conditions. |
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| Keywords: Drought stress, Heritability, Interspecific hybridizations, Response to selection and Safflower. |
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Full-Text [PDF 794 kb]
(1075 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2019/03/13 | Accepted: 2019/03/13 | Published: 2019/03/13
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