CYTOGENETICAL STUDIES ON THE GENUS ORYZA

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Abstract
By using starch gel electrophoresis, the zymograms of acid phosphatase and peroxidase in the leaf extracts were examined, and the phylogenetic relationships between diploid parental species, their F1 plants, synthesized amphiploids and natural tetraploid species belonging to O. officinalis complex were postulated on the basis of comparisons of zymograms. The similarity index (s-value; Sheen) was computed in all possible combinations of 17 strains tested. The s-values found between the tetraploid varieties of O. punctata (W1024 and W1145) and synthesized amphiploids 4x-3 (punctata .times. collina), 4x-1137 (intermediate .times. punctata), and 4x-1 (punctata .times. eichingeri), O. minuta (W0016) and O. malampuzhaensis (W1159) were 91, 96, 48, 31-36 and 52%, respectively. The tetraploid punctata strains thus showed much closer relationships with the synthesized amphiploids than with other tetraploid species, i.e., O. minuta and O. malampuzhaensis. This suggests that the progenitor of O. eichingeri and an intermediate punctata-eichingeri form would also be the progenitor of species with the C genome which was a component of tetraploid strains of O. punctata (BBCC).

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