Simultaneous detection of different Rhizobium strains marked with either the Escherichia coli gusA gene or the Pyrococcus furiosus celB gene
Sessitsch, A. | Wilson, K.J. | Akkermans, A.D.L. | Vos, W.M. de
A new marker system for gram-negative bacteria was developed on the basis of the celB gene from the hyperthermophilic archaeon Pyrococcus furiosus, which encodes a thermostable beta-glucosidase with a high level of beta-galactosidase activity. The celB gene is highly suitable as a marker for studying plant-bacterium interaction because endogenous background beta-glucosidase and beta-galactosidase enzyme activity can readily be inactivated by heat and because inexpensive substrates for detection are commercially available. Two celB-expressing transposons were constructed for use in ecological studies of a variety of gram-negative bacteria. The combined use of the gusA marker gene and celB allowed the simultaneous detection of several Rhizobium strains on a plant, and multiple-strain occupancy of individual nodules also could be easily detected.
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