An instance of instability at the Pr locus has been detected while analysing the c-m55437 allele. The mutant phenotype exhibited red and purple spots on a colourless background on the same kernel. This spotting pattern is due to the mutability of an En-induced (autonomous) mutable c-m55437 allele superimposed with the pr mutability. That the mutability is associated with the Pr locus was confirmed in crosses with pr tester. The progeny kernels exhibiting pr mutability showed purple sectors on a red background. This mutant has been designated pr-m860192. Preliminary data suggest that the mutability is induced either by an autonomous element or by more than one independently segregating copies of the same element (Table 1). The pr mutant stocks also contained the En element. Further characterization of the allele is in progress.
Table 1: Test cross of sectored type. The cross pr-m/pr X pr/pr
A.R. Reddy, PA. Peterson and Ch. Jayaram
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