Chemically induced paramutation at the R locus in maize.
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Chemically induced paramutation at the R locus in maize.
The R gene in maize, conditioning anthrocyanin formation in seed and plant, invariably is changed from a darkly pigmenting to a weakly pigmenting (repressed) form in the progeny of heterozygotes carrying the stippled (Rst) allele. The repressed forms of R are gametically transmitted, and are referred to as paramutant (R') alleles.' 3 The evidence presented in this report shows that R' alleles a...
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HE R locus in maize exhibits two different kinds of genetic variability, mutation and paramutation (BRINK 1960). Mutation is a rare event, not predictable in an individual gamete, and produces a limited number of visually distinct mutant phenotypes. In contrast, paramutation is a directed change in the pigmenting ability of an R allele which invariably occurs in certain genotypes, and results i...
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The maize purple plant (pl) locus encodes a transcription factor required for anthocyanin pigment synthesis in vegetative and floral tissues. The strongly expressed Pl-Rhoades (Pl-Rh) allele is unstable, spontaneously changing to weaker expression states (Pl') at low frequencies and exclusively changing to Pl' in Pl'/Pl-Rh heterozygotes. The weakly expressed Pl' state is mitotically and meiotic...
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Paramutations represent locus-specific trans-homolog interactions affecting the heritable silencing properties of endogenous alleles. Although examples of paramutation are well studied in maize (Zea mays), the responsible mechanisms remain unclear. Genetic analyses indicate roles for plant-specific DNA-dependent RNA polymerases that generate small RNAs, and current working models hypothesize th...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1967
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.58.1.181