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DNAP ISOLATES ACIDITY-CONTROLLING GENE -FIRST TIME GENE ISOLATION METHOD DEMONSTRATED IN HIGHER PLANTS-

 CINNAMINSON, N.J., April 21 /PRNewswire/ -- DNA Plant Technology Corporation (NASDAQ: DNAP) announced today that it had isolated a plant gene which regulates acidity, a major determinant of flavor in fruit and of color in flowers.
 Isolation of this acidity-determining gene represents the first reported demonstration of a new genetic technique, known as heterologous transposon tagging. This method, patented by DNAP, allows a gene to be isolated based only on understanding of the desired genetic trait it confers to the plant, rather than the specific chemical or molecular function of the gene.
 DNAP researchers have transferred "transposons" (movable DNA elements) from maize and have inserted them in genes of interest to physically tag and isolate them. This represents the first time a gene has been isolated using a transposon from another plant species as a probe.
 A description of this heterologous transposon tagging method is the subject of a cover article this month in the peer-reviewed journal, The Plant Cell.
 The isolated acidity-controlling gene will be used by DNAP scientists in tomatoes and other fruits and vegetables to control the acidity component of flavor. DNAP will use its already high-quality VineSweetTM germplasm -- in which ripening will also be controlled -- to produce a superior second-generation fresh market tomato.
 The acidity gene was originally identified in its role in coding the enzymes which control the level of acidity responsible for the change of color, from red to blue, in petunia flowers. The gene is the subject of a United States patent application filed by DNAP.
 DNAP is a leading agricultural biotechnology company, applying a spectrum of technologies to develop and commercialize plant-based products and environmental diagnostic products for consumer and industrial markets. The company has two major operating joint ventures -- FreshWorld in premium fruits and vegetables, and InterMountain Canola Company in special varieties of edible canola oil.
 -0- 4/21/93
 /CONTACT: John Bedbrook, Ph.D. of DNA Plant Technology, 609-829-0110, or Fredric J. Spar of Kekst and Company, 212-593-2655, for DNA Plant Technology/
 (DNAP)


CO: DNA Plant Technology Corporation ST: New Jersey IN: MTC SU:

KD -- NY038 -- 8589 04/21/93 10:04 EDT
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Publication:PR Newswire
Date:Apr 21, 1993
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