Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 98:337-342 (1992)
© 1992 American Society of Plant Biologists

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Development and Growth Regulation

Immunological Evidence of Thaumatin-Like Proteins during Tobacco Floral Differentiation 1

Luc Richard, Montserrat Arró, Johan Hoebeke, D. Ry Meeks-Wagner and Kiem Tran Thanh Van

Laboratoire de Physiologie Végétale, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette, France, Laboratoire des Protéines des Liquides biologiques, URA 1334, Centre National de la Recherche Scientifique, Université François Rabelais, 37032 Tours, France, Institute of Molecular Biology, University of Oregon, Eugene, Oregan 97403

Tobacco proteins that share homology with thaumatin, a sweet protein of Thaumatococcus daniellii Benth., are produced in various physiological situations such as pathogenesis-related stress or water deficit stress. Using purified polyclonal anti-thaumatin antibodies, we have detected other thaumatin-like proteins in tobacco (Nicotiana tabacum var Samsun) that have been related with floral differentiation. Thaumatin-like proteins with apparent molecular masses of 42.6, 31.6, and 26.3 kilodaltons were found in immature and mature flower organs in vivo, and others of 46.7, 41.7, and 27.5 kilodaltons were exclusively detected in thin cell layer explants forming flowers. In situ immunolocalization revealed their synthesis in newly differentiated floral meristems, in tracheids, and in parenchyma cells.

1 Support from National Science Foundation grant DCB 8802163 to D.R.M.-W.




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A. R. Walden, C. Walter, and R. C. Gardner
Genes Expressed in Pinus radiata Male Cones Include Homologs to Anther-Specific and Pathogenesis Response Genes
Plant Physiology, December 1, 1999; 121(4): 1103 - 1116.
[Abstract] [Full Text]


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Copyright © 1992 by the American Society of Plant Biologists