Summary
It is established that in a naturally occurring variegated Impatiens balsamina the phenotype is determined by a mutable allele p m, of an anthocyanin-governing gene P r. The special allele produces an acyanic phenotype like the stable recessive p but undergoes frequent changes to P r in somatic and germinal cells (causing a variegated phenotype in the former) when a controlling element M is also present in the genome. It is suggested that p m is a repressed p r and M acts either by removing or inactivating whatever causes that repression. Such changes proceed in a unique fashion: either p m changes to p r or to an intermediate labile condition P′ which then changes to p r, resulting either in dark or pale, or dark super-imposed on pale, sectors; a reverse situation was not observed. Colourless plants which occasionally appear in unstable lines seem to be due to loss of M although changes ofp m itself cannot be ruled out at present.
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Communicated by R. Hagemann
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Sastry, G.R.K. Genetic instability of anthocyanin production in Impatiens balsamina . Theoret. Appl. Genetics 63, 87–95 (1982). https://doi.org/10.1007/BF00303498
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DOI: https://doi.org/10.1007/BF00303498