Absence of a detectable change in Ds at the A₁ locus in maize following mutagenic treatments

Abstract

Various mutagenically-effective treatments for Sh₂ locus failed to produce any back mutation of the closely linked A₁Ds̅ marker complex. Nor were any Ac-like elements generated. An excision-repair model was proposed to explain the stability of Ds mutations in the absence of Ac and its high mutability in the presence of Ac. A number of other observations on mutable loci in maize were also explained on the basis of this scheme.