Abstract
Esterase isoenzymes in the leaf blade were observed in a large number of rice strains and hybrid plants between certain parental strains. The slowest isoenzyme band, 1A, was specified by a dominant allele at the esterase locus Est1 The second band-group, 6A and 7A, was controlled by codominant alleles. Est2S and Est2F at Est2, where was also found a null allele. The third band-group, 12A and 13A, was controlled by codo-minant alleles, Est3S and Est3F at Est3. Among the three loci, no linkage relation was indicated between Est1 and Est2 and between Est2 and Est3. These loci involving five dominant and two null alleles are expected to produce twelve zymograms. Among 1, 095 strains of native cultivars observed, eleven out of the twelve expected zymograrns were found and no other pattern appeared. The isoenzymic genotypes well corresponded to conventional varietal groups.
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