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THE PLANT CELL, Vol 1, Issue 7 665-670, Copyright © 1989 by American Society of Plant Biologists

RESEARCH ARTICLES

Promoters of the rolA, B, and C Genes of Agrobacterium rhizogenes Are Differentially Regulated in Transgenic Plants

T. Schmulling, J. Schell and A. Spena
Max-Planck-Institut fur Zuchtungsforschung, D-5000 Koln 30, Federal Republic of Germany

Chimeric genes containing the [beta]-glucuronidase reporter gene under the control of the rolA, B, and C promoters of Agrobacterium rhizogenes are expressed in a regulated manner in transgenic plants. The intergenic region separating the rolB and C genes represents a bidirectional promoter. This bidirectional promoter regulates transcription for both genes in a similar fashion in aerial organs of the plants, but in a distinct way in roots. Moreover, both rolB and C promoter activities differ from those characteristic of the rolA promoter. Thus, promoters of bacterial origin show differential expression in transgenic plants, and regulation of rol gene expression plays a role in the biological effects caused by the rolA, B, and C genes.


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