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THE PLANT CELL, Vol 5, Issue 8 843-853, Copyright © 1993 by American Society of Plant Biologists

RESEARCH ARTICLES

Ectopic Expression of pMADS3 in Transgenic Petunia Phenocopies the Petunia blind Mutant

S. Tsuchimoto, A. R. van der Krol and N. H. Chua
Laboratory of Plant Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, New York 10021

We cloned a MADS-box gene, pMADS3, from Petunia hybrida, which shows high sequence homology to the Arabidopsis AGAMOUS and Antirrhinum PLENA. pMADS3 is expressed exclusively in stamens and carpels of wild-type petunia plants. In the petunia mutant blind, which shows homeotic conversions of corolla limbs into antheroid structures with pollen grains and small parts of sepals into carpelloid tissue, pMADS3 is expressed in all floral organs as well as in leaves. Ectopic expression of pMADS3 in transgenic petunia leads to phenocopies of the blind mutant, i.e., the formation of antheroid structures on limbs and carpelloid tissue on sepals. Transgenic tobacco plants that overexpress pMADS3 exhibit an even more severe phenotype, with the sepals forming a carpel-like structure encasing the interior floral organs. Our results identify BLIND as a negative regulator of pMADS3, which specifies stamens and carpels during petunia flower development.


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Copyright © 1993 by the American Society of Plant Biologists