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Genetics, Vol 131, 199-209, Copyright © 1992
INVESTIGATIONS |
Insertional Mutagenesis of the Maize P Gene by Intragenic Transposition of Ac
P. Athma, E. Grotewold and T. Peterson
Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724
The P-rr allele of the maize P gene regulates the synthesis of pigments derived from flavan-4-ol in the pericarp, cob glumes and other floral organs. We characterized 21 P alleles derived by intragenic transposition of Ac from three known positions. Ac transpositions can occur in either direction in the P gene, and with no apparent minimum distance: in one case Ac transposed just 6 bp from its original insertion site. However, the distribution of transposed Ac elements was markedly nonrandom: of 19 transposed Ac elements derived from a single Ac donor, 15 were inserted in a 1.1-kb region at the 5' end of P, while none had inserted in an adjacent 3.2-kb intronic region. All of the Ac insertions affect both pericarp and cob glume pigmentation, providing further evidence that the P-rr allele contains a single gene required for both pericarp and cob glume pigmentation. The distribution of the inserted Ac elements and the phenotype conditioned by each allele suggests a structure of P-rr which is similar to that previously determined molecularly. Possible explanations for the nonrandom distribution of transposed Ac elements are discussed.
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