| Fertility of F1 hybrids between Triticum
persicum and Aegilops squarrosa No. 1 Jun-ichiro TABUSHI Laboratory of Genetics, Faculty of Agriculture, Kyoto University, Kyoto, Japan In 1947, Kihara and his collaborators produced the hybrids between various Emmer and Aegilops squarrosa, from which F2 plants were obtained in 1948. These plants were the amphidiploids. Out of these, the amphidiploid between T. persicum and Ae. squarrosa No. 2 was most closely resembling T. vulgare in the morphological characteristics, and the fertility was better than the other amphidiploids. The present writer used Ae. squarrosa No. 1 as father plant, and crossed to T. persicum stramineum. In 1956 two F1 hybrid were obtained. The growth of these plants was worse than F1 plants in which Ae. squarrosa No. 2 was used as father plant in 1947, and also they were fairly susceptible to rust disease. Table 1 shows the results of the observations of MI at various stages in one F1 plant. As showed in Table 1, the percentage of 21I cells increased as time goes on. Table 2 shows the pollen-fertility of the hybrids in different ear. That is, in the flowers of first heading ear the anthers did not burst and the pollen-fertility was very low, but the anthers of the flowers which headed lately bursted and showed fairly good fertility, but the seed was not obtained. |