1969 年 34 巻 4 号 p. 528-532
The mutational responses of the A1-Dt system in maize to a chemical mutagen, namely maleic hydrazide (MH) was studied in material homozygous for the highly mutable (Dt-responsive) αm1 allele, as a part of a comprehensive study aimed at understanding factors concerned in the stability (or conversely high mutability) of genetic elements.
A two-fold action of the mutagen could be recognized: (1) one manifested in a reduction in the number of coloured (A1) spots-each presumably resulting from a somatic mutation of αm1 to A1 in the presence of the non-allelic Dt gene; and (2) the other expressed as an increase in the average as well as maximum length of coloured spots. The former is probably due to the loss of the Dt gene (chromosomal aberration) and the latter due to more frequent early somatic mutations.
The use of the αm1-Dt system for distinguishing between different effects of a mutagen was suggested.