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HE anthocyanin-producing action of the R' allele in maize invariably is reduced by passing R' through a heterozygote with the stippled ( RrRSt) or the marbled allele ( RrRmb). The induced changes in R' are gametically transmissible in metastable form (BRINK 1956, 1960; BRINK and WEYERS 1957; BRINK and MIKULA 1958). It is now found that Rr activity can regularly be altered in directed fashion also, in a quite different way, namely, by insertion of the factor in certain reciprocal translocations involving the long arm of chromosome 10 in which the R locus is situated. The change in Rr action in these cases is to a higher-than-standard level of pigment production; and the increase persists in the absence of the inciting agent. The results of experiments with two such structural alterations are presented in the present article.

PERSISTENT ENHANCEMENT OF Rr ACTION IN MAIZE BY STRUCTURAL ALTERATIONS OF CHROMOSOME 10