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Transposition of a receptor element (Rs ) for the suppressor-mutator (Spm ) has generated the firstSpm -controlled mutable allele of the bronze-1 (bz ) locus in maize (Zea mays L.). In the absence ofSpm, bz-m13 conditions full anthocyanin pigmentation in the aleurone but has a markedly decreased level compared to wild type of the gene product, UDPglucose:flavonol 3-O -glucosyltransferase (UFGT; EC 2.4.1.91). This UFGT activity appears to be qualitatively similar to the wild-type enzyme. Throughout endosperm development, the amount of a crossreactive material far exceeds the amount of detectable UFGT activity. This and other observations suggest that this insertion ofRs leads to the production of two polypeptides from thebz-m13 allele.

Biochemical consequences of the insertion of a suppressor-mutator ( Spm ) receptor at the bronze-1 locus in maize