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The Journal of Heredity 1992:83(2):114-118
© 1992 The American Genetic Association 83:114-118

research-article

Mutator Transposable Elements That Occur in Clusters in the Maize Genome

S. C. Ingels, J. L. Bennetzen, S. H. Hulbert, M. Qin, and A. H. Ellingboe

Department of Plant Pathology, University of Wisconsin 1630 Linden Drive, Madison, Wl 53706
Department of Genetics, University of Wisconsin 1630 Linden Drive, Madison, Wl 53706
Department of Biological Sciences, Purdue University West Lafayette, Indiana

Address reprint requests to Dr. Ellingboe in the Department of Plant Pathology at the address above.

Abstract

The Mu transposable elements in Mutator maize lines have been found in many regions of the maize genome, but our preliminary work suggested that in individual genomes the elements might be distributed in clusters. We used DNA gel blot hybridization to assess the genetic linkage of individual Mu elements in 34 of the progeny of a cross between a Mutator maize plant and a non-Mutator maize plant. Chi square tests for independence show that at least seven of the 21 elements are linked into three clusters: two clusters of two elements each and one cluster of three elements. In 11 progeny of a second family of Mutatormaize we identified one cluster of five elements, one cluster of three, and two pairs. The degree of clustering in both these families is significantly greater than what would be likely to arise if Mutator elements were distributed with uniform probability throughout the maize genome.


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