Abstract: The present invention relates to the qualitative and/or quantitative determination of a proteinaceous molecule in a plurality of samples by combining a particular labeling and fractionation strategy. In particular, each sample is provided with a dye chosen from a set of dyes, wherein each dye within the set of dyes emits luminescent light at a wavelength that is sufficiently different from the emitted luminescent light of the remaining dyes in the set of dyes to provide a different light signal when excited. Subsequent to labelling the proteinaceous molecule with the fluorescent dye, the samples are combined and fractionated by means of electrophoresis, the labeled proteinaceous molecule having a relative electrophoretic mobility that differs from the electrophoretic mobility of the proteinaceous molecule labeled with another dye within the set of dyes. After capturing separate images of the labeled proteinaceous molecule at different wavelengths, the images are aligned by means of image processing.

Abstract: Disclosed are polynucleotides that encode a beta-glucosidase belonging to the plant protein class of family 1 glycoside hydrolases. Furthermore described are recombinant nucleic molecules and vectors containing these polynucleotides and host cells, preferably plant cells that are genetically engineered with these polynucleotides. In addition, transgenic plants are disclosed which show an increased activity of the beta-glucosidase described, preferably leading to an improved resistance against plant pathogens. In another aspect, the present application discloses screening methods for identifying a substrate for said betaglucosidase and methods for the production of plant protection compositions from such substrates or hydrolysis products thereof. Furthermore, methods and uses are disclosed which apply the polynucleotides encoding the beta-glucosidase described in order to improve resistance in plants against plant pathogens.