Аннотация:Hordeum vulgare was intercrossed with 26 wild Hordeum species representing 37 cytotypes. Seed set was obtained from all crosses, whereas adult plants (hybrids or haploids) resulted from only 22 of the intercytotype combinations (15 species). Crosses were more successful when Hordeum vulgare was used as the pollen donor rather than as the female parent. Combinations with diploid cytotypes were difficult to obtain. In spite of good seed set, flowering diploid combinations were obtained in only three combinations, viz. with H. marinum, H. depressum, and H. brachyantherum. Haploids resulting from chromosome elimination were established in four combinations, viz. with H. marinum, 2x and 4x, H. brachyantherum, 6x, and with H. leehleri, 6x (the last mentioned giving hybrids as well as haploids). Generally, variation in somatic and meiotic chromosome numbers was observed in the hybrids. Meiotic pairing, studied in 13 combinations, was low except in the hybrid with H. hulbosum. Some indications of a genetic regulation of the meiotic pairing were found.
