Abstract
SUMMARYThree transposable element mutations, displaying an unstable pheno-type at theAlocus, were isolated from lines exhibiting Aberrant Ratio behaviour that originated from maize plants treated with plant RNA viruses. Each of these three unstable mutants is shown to belong to theUq-ruqtransposable element system. The two new mutants, along with the previously describeda-ruqmutant, are nonautonomous in mutability control in that the control of mutability is governed by the segregatingUqregulatory element. By following the distribution of differentUqelements segregating in independently derived genetic lines and utilizing tests of allelism and linkage, certain lineages ofUq-element-containing lines are revealed.
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