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[9000505.] رقم البحث : 9000505 - |
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Inheritance of Yield and Some Physiological Traits Related to Drought Tolerance in Wheat Crosses (Triticum aestivum l.) / |
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Agricultural Research Journal Suez Canal University / |
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G.A. Morshed. |
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E. A. El-Ghareib |
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M. A. M. Eid |
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M. Y. El-Masry |
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Genetic parameters, water stress, diallel and wheat hybrids |
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In a study to determine the nature of gene action for yield and some physiological traits in wheat. Six diverse parents were used in a diallel cross without reciprocals in 2005/2006, 2006/2007 and 2007/2008 seasons. The experiments were conducted at the Ismailia Agriculture Research Station under three water regimes. The first water regime was non-stress (I1) 2000 m3 water/fad, the second water regime was 1500 m3 (I2) and the third water regime was severe water condition 1000 m3 (I3) water/fad. The results showed that water stress reduced the flag leaf area, relative water content (RWC), photosynthetic pigments, 1000-kernel weight and grain yield/plant. The crosses P1xP2 and P2xP6 were considered as the best hybrids for grain yield and other traits, revealing their importance in improving wheat in breeding programs for drought tolerance. The magnitude of dominance components (H1 and H2) was higher than the corresponding additive one (D) for all studied traits, indicating the important role of over dominance effect in the genetic control of these traits. Moreover, the heritability values in narrow sense were relatively low for all traits and ranged from 15.7% for relative water content to 55.5% for grain yield/plant due to subjected wheat plant to water stress. |
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