Heterosis and inheritance of drought tolerance in faba bean, Vicia faba L. |
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Authors: | A A Abdelmula W Link E Von Kittlitz D Stelling |
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Institution: | Institute of Agronomy and Plant Breeding, von Siebold-Straße 8, D-37075 Göttingen, Germany;Landessaatzuchtanstalt Stuttgart-Hohenheim (720), D-70593 Stuttgart, Germany;Hoechst Schering Agrevo GmbH, Werftstrße 37, D-40549 Düsseldorf, Germany |
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Abstract: | Twelve parental lines of faba beans and 27 F1 hybrids derived from them were field-tested under a dry and a well-watered treatment, at two German locations (Göttingen, Hohenheim) in two years (1995, 1996). Drought was artificially induced using rain shelters from anthesis until maturity. Data were collected on yield under dry (Yd) and well-watered (Yw) conditions. Drought tolerance was assessed as Yd/Yw. The mid-parent heterosis was significant for Yd and Yw, but not for Yd/Yw. Relative heterosis for Yd (52.0%) was greater than for Yw (39.3%). Parental heritability was greater for Yw (0.86) than for Yd (0.61). However, it was similar for both traits in F1 hybrids (0.65 and 0.66). Principal component analysis showed that F1 hybrids exhibited the same pattern of adaptation as their parents. The heritability of drought tolerance was 0.48 in F1 hybrids and 0.70 in parents. Attention should be paid to its negative correlation with yield. Several hybrids combined high tolerance, a favourable pattern of adaptation and appropriate performance. |
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Keywords: | Vicia faba adaptation drought tolerance heritability heterosis inheritance |
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