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Modified Development in Transgenic Tobacco Plants Expressing a rolA∷GUS Translational Fusion and Subcellular Localization of the Fusion Protein

September 1998 , Volume 11 , Number  9
Pages  855 - 859

Françoise Vilaine , 1 Jacques Rembur , 2 Dominique Chriqui , 2 and Mark Tepfer 1

1Laboratoire de Biologie Cellulaire, INRA-Centre de Versailles, 78026 Versailles Cedex, France; 2Laboratoire CEMV, Bât. N2, Université Pierre et Marie Curie, 4, place Jussieu, 75252 Paris Cedex 05, France

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Accepted 6 June 1998.

The rolA gene is transferred naturally by Agrobacterium rhizogenes to the genome of host plants, where it induces dramatic changes in development of transformed plants, including dwarfism and leaf wrinkling. The predicted translation product of the rolA gene is a small (11.4 kDa), basic (pI = 11.2) protein, which has no clearly significant similarity to sequences in the data bases. We have introduced into the tobacco genome a gene encoding a rolA∷GUS fusion protein. Expression of this gene led to synthesis of an RNA and a protein of expected size, and the transformed plants exhibited the dwarfism and leaf wrinkling typical of rolA plants, but to a lesser degree than plants transformed with the wild-type rolA gene. The distribution of β-glucuronidase (GUS) activity was compared in subcellular fractions of leaf extracts from plants expressing either the rolA∷gus gene or a control gus construct. As expected, in the control plants, GUS activity was essentially cytosolic. In contrast, in plants expressing the rolA∷gus gene the highest specific activity was associated with the plasmalemma fraction.

© 1998 The American Phytopathological Society