Cytogenetical studies on the genus Oryza. XIII. Relationship between the genomes E and D.

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Abstract
To clarify the relationship between E genome of O. australiensis and D genome of CCDD genome species, F1 hybrids of O. officinalis (CC) .times. O. australiensis (EE), CE plant .times. CCDD genome species and amphiploid CCEE .times. CCDD genome species were studied. CE plant was morpholgically similar to O. australiensis than to O. officinalis, and the F1 hybrids of CE plant .times. CCDD genome species and of amphiploid CCEE .times. CCDD genome species were similar to the CCDD genome species. Somatic chromosome numbers in the F1 hybrids of CE plant .times. CCDD genome species ranged from 46-72. The hybrids of O. officinalis .times. O. australiensis and amphiploid CCEE .times. CCDD genome species were 24 and 48, respectively. At MI chromosome differences in size were observed in the F1 hybrid of O. officinalis .times. O. australiensis. Number of bivalents at MI of the F1 hybrids having 48 chromosomes (2n) obtained from the cross between CE plant and CCDD genome species ranged from 15-23 with a mean of 18.2 (CES-4) to 19.9 (CES-15), while that from the cross between amphiploid CCEE and CCDD genome species ranged from 8-24 with a mean of 17.6 (C-1) to 20.9 (B-1). These results suggest that the genomes E and D may be closely related.

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