Abstract
VARIEGATION for flower colour in certain Nicotiana cultures results from changes in the functional state of a genetic locus, V. The dramatic frequency with which these spontaneous changes may occur in somatic tissue is illustrated in Fig. 1A. The germinal changes in state, while potentially reversible, have sufficient persistence to permit their genetic detection by means of altered progeny segregations. Therefore, by genetic criteria, the V locus alterations have all of the characteristics of reversible mutations. Each of the functional states appears to possess genetic integrity. The question arises of whether to view these different states as nuclear differentiations or as alterations of genetic code. If the former view were taken, the phenomenon should likely be considered ‘paramutation’ in the generalized sense utilized by Brink1.
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