GENETIC-FACTORS CONTROLLING OUTCROSSING IN FABA-BEAN (VICIA-FABA) - EFFECTS OF POLLEN DONOR AND RECEPTOR GENOTYPES AND ESTIMATES OF INTER-RECEPTOR CROSS-FERTILIZATION

For the production of hybrid and synthetic varieties, high rates of cr oss-fertilization are needed. Two aspects of cross-fertilization in Vi cia faba L. were studied at Wageningen in 1989 and 1990. The occurrenc e of cross-fertilization between pollen receptor lines in large-scale assays for cross-fertilization was determined. Furthermore, the contri bution of the genotype of the donor, of the receptor, and of their spe cific interactions in terms of cross-fertilization rate were studied. Inter-receptor cross-fertilization may represent from 2 to 70 % of the total cross-fertilization. Inter-receptor cross-fertilization increas es when donors and receptors do not match for flowering height. The ge notype of the receptor appeared to be of importance for the cross-fert ilization rate. No differences in cross-fertilization rate due to gene tic differences between pollen donors were noticed. Also no significan t specific donor x receptor interaction effect on cross-fertilization rate could be observed.