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Plant Cell, Vol. 10, 399-412, Copyright © 1998, American Society of Plant Physiologists

Characterization of dull1, a Maize Gene Coding for a Novel Starch Synthase

Ming Gaoa, Jennifer Wanata, Philip S. Stinarda, Martha G. Jamesa, and Alan M. Myersa
a Department of Biochemistry and Biophysics, Iowa State University, Ames, Iowa 50011

Correspondence to: Alan M. Myers, ammyers{at}iastate.edu (E-mail), 515-294-0453 (fax).

The maize dull1 (du1) gene is a determinant of the structure of endosperm starch, and du1– mutations affect the activity of two enzymes involved in starch biosynthesis, starch synthase II (SSII) and starch branching enzyme IIa (SBEIIa). Six novel du1– mutations generated in Mutator-active plants were identified. A portion of the du1 locus was cloned by transposon tagging, and a nearly full-length Du1 cDNA sequence was determined. Du1 codes for a predicted 1674-residue protein, comprising one portion that is similar to SSIII of potato, as well as a large unique region. Du1 transcripts are present in the endosperm during the time of starch biosynthesis, but the mRNA was undetectable in leaf or root tissue. The predicted size of the Du1 gene product and its expression pattern are consistent with those of maize SSII. The Du1 gene product contains two repeated regions in its unique N terminus. One of these contains a sequence identical to a conserved segment of SBEs. We conclude that Du1 codes for a starch synthase, most likely SSII, and that secondary effects of du1– mutations, such as reduction of SBEIIa, result from the primary deficiency in this starch synthase.


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