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Reconstitution of the variegated pericarp allele in maize by transposition of modulator back to the p locus



Reconstitution of the variegated pericarp allele in maize by transposition of modulator back to the p locus



Genetics 53(1): 7-16



An experiment was conducted to determine whether the process whereby self-red pericarp (Prr) mutants in maize arise in medium variegated pericarp plants (PrrMp/Pwr) by transposition of Modulator (Mp) away from the prr gene to another chromosome site could be reversed so as to reconstitute the variegated allele (PrrMp) by transposition of Mp baokto the P locus. elf-red pericarp, highly inbred plants, heterozygous for colorless pericarp (PrrPwr) in which the prr gene na(i been derived originally by mutation from variegated pericarp, and was closely linked to a transposed Modulator, served as the foundation stock. A total of 156 mutants were isolated by selecting sectored kernels on the prrpwr ears, and 146 of them were found to exhibit variegated pericarp. All the variegated mutants proved to be Mp+ and behaved as P alleles, as would be expected if Mp had been transposed back to the P locus. Some of the mutants were indistinguishable both in phenotypic effect and breeding behavior from the standard mediun-variegated allele from which the foundation Prr stock initially was derived. These mutants are considered to be examples of reconstitution of the variegated pericarp allele in its original, or standard, form. The majority of mutants isolated from the prrpwr plants, however, conditioned other variegated pericarp phenotypes. The position of Mp relative to that of the Prr gene with which Mp has become reassociated may be slightly different than in the standard medium-variegated pericarp allele.

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Accession: 014635120

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PMID: 17248291


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