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Autofertility and rate of cross-fertilization: crucial characters for breeding synthetic varieties in faba beans (Vicia faba L.)

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Summary

To increase the level and stability of yield in faba beans (Vicia faba L.), heterosis must be exploited. Hybrids are not available because of the instability of male sterility. Synthetic varieties can and should be bred. Thus, we studied the reproductive behavior of this partially allogamous, insect-pollinated crop. Autofertility (AF) and the rate of cross-fertilization (C) were measured in 36 inbred lines and 28 crosses in F1, F2, and F3 generations for 3 years at Hohenheim, Stuttgart, FRG. Heterozygosity strongly increased AF and decreased C. AF was negatively correlated with C. AF varied from 1% to 98%, and C varied from 7% to 82%. Heritability for both characters was high. For an optimum exploitation of heterosis, breeders should utilize lines with high C as variety components. It is often labor-intensive to multiply such lines, due to low AF. Hence, breeders tend to use autofertile lines with rather limited C. We showed that even in this case about 50% of the total heterosis, which equals a yield increase of at least 25% over the inbred line level, is realized. An increase in yield stability due to heterogeneity will occur simultaneously.

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Communicated by A. R. Hallauer

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Link, W. Autofertility and rate of cross-fertilization: crucial characters for breeding synthetic varieties in faba beans (Vicia faba L.). Theoret. Appl. Genetics 79, 713–717 (1990). https://doi.org/10.1007/BF00226888

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  • DOI: https://doi.org/10.1007/BF00226888

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