The c2-m1 allele, an Spm allele (McClintock, Carnegie Yearbook 62:486, 1963), is an autonomous-acting allele that has a pattern of mutability that can be classified as medium-early.
In a search for revertants (Rev) among two families
of plants that were homozygous c2-m1/c2-m1 and were test crossed by a marked
tester, the following was found:
|2 40(4.2)||902||2||( .2)||5||949|
In previous studies with En-controlled alleles, as a-m(papu) (Peterson, TAG 40:367, 1970), it is the colorless non-spotting types that appear in high frequency. This high frequency of Rev relative to the low frequency of colorless types may possibly be indicative of its exon vs. intron placement of the element within the c2 locus.
Peter A. Peterson
Return to the MNL 60 On-Line Index
Return to the Maize Newsletter Index
Return to the Maize Genome Database Page