Abstract
The experiment was designed to make clear the relationship among the B. C and D genomes in Oryza. Eight BF1 hybrids, consisting of the F1 hybrids of the A x BC and A genome and the F1 hybrids of the A X CD and genome, were cytologically studied. From a large number of flowers pollinated 131 seeds (43 lines) of various degrees of development were obtained. Out of 29 lines (82 seedlings) which grew up to adult plants, 8 were cytologically studied. It was suggested that most of the bivalents formed at meiosis of the F1 hybrids in the genomic cross-combinations, A X BC, or A X CD, arose through the homology or partial homology between and A and C genomes.

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