Efficiency of drained selection environments for improving grain yield in faba bean under undrained target environments on vertisol |
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Authors: | Gemechu Keneni Belay Asmamaw Musa Jarso |
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Institution: | (1) Holetta Research Center, P.O.Box 2003, Addis Ababa, Ethiopia |
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Abstract: | Waterlogging is a major constraint of faba bean (Vicia faba L.) production in the highland vertisols of Ethiopia. Genotypes are currently evaluated under both the drained conditions
of Broad Bed and Furrow(BBF) and the undrained flatbeds. The objective of this research was to determine if selection of genotypes
under BBF is efficient for identification of genotypes for the flatbed conditions. Yields under the flatbed conditions were
lower by 20–50% (38% on average) than yields under the BBF. Genetic variation, heritability and predicted genetic gains for
grain yield due to direct selection were also lower under the flatbeds than they are under the BBF. There were good levels
of genetic correlation (r = 0.20–0.75 or0.45 on average) between yield performances under BBF and flatbeds, indicating that
selection under BBF may identify good genotypes for flatbeds and vice versa. There was also high association (r =0.91) between
relative yield reduction under flatbeds and the ratio of the predicted genetic gains from indirect selection under BBF to
the predicted genetic gains from direct selection under flat beds. This indicates that indirect selection under BBF may be
useful to identify better genotypes for flatbed conditions, but the relative efficiency of indirect selection was lower than
direct selection under flatbeds themselves.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | broad-sense heritability direct selection faba bean indirectselection predicted genetic gain Vicia faba L |
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