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THE PLANT CELL, Vol 8, Issue 8 1249-1259, Copyright © 1996 by American Society of Plant Biologists
The Maize Repressor-like Gene intensifier1 Shares Homology with the r1/b1 Multigene Family of Transcription Factors and Exhibits Missplicing
F. A. Burr, B. Burr, B. E. Scheffler, M. Blewitt, U. Wienand and E. C. Matz
Biology Department, Brookhaven National Laboratory, Upton, New York 11973-5000
The recessive mutation intensifier1 of maize apparently causes an overall
increase in flavonoid production in the aleurone. The mechanism by which
this is achieved is not understood. We have succeeded in cloning the
intensifier1 gene by transposon tagging with Suppressor-mutator and found,
by sequence analyses, that it shares homology with known transcription
factors in the anthocyanin pathway, in particular the r1/b1 multigene
family in maize. Two cDNAs and a genomic clone were completely sequenced,
and together they showed that the transcripts were misspliced. The
frequency of missplicing was investigated by polymerase chain reaction
analyses and sequencing of the individual introns. These studies indicate
that very little functional transcript was made. Indeed, missplicing may be
a mechanism for reducing the levels of a transcription factor that, when
present, acts as a repressor of anthocyanin biosynthesis.
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