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PLANT PHYSIOLOGY , Vol 103, Issue 4 1041-1046, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Conversion of Perianth into Reproductive Organs by Ectopic Expression of the Tobacco Floral Homeotic Gene NAG1
S. A. Kempin, M. A. Mandel and M. F. Yanofsky
University of California, San Diego, Department of Biology and Center for Molecular Genetics, La Jolla, California 92093-0116
Mutations in the AGAMOUS (AG) gene of Arabidopsis thaliana result in the
conversion of reproductive organs, stamens and carpels, into perianth
organs, sepals and petals. We have isolated and characterized the putative
AG gene from Nicotiana tabacum, NAG1, whose deduced protein product shares
73% identical amino acid residues with the Arabidopsis AG gene product. RNA
tissue in situ hybridizations show that NAG1 RNA accumulates early in
tobacco flower development in the region of the floral meristem that will
later give rise to stamens and carpels. Ectopic expression of NAG1 in
transgenic tobacco plants results in a conversion of sepals and petals into
carpels and stamens, respectively, indicating that NAG1 is sufficient to
convert perianth into reproductive floral organs.
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