Abstract: Disclosed herein are rooted plant assay systems, methods of making rooted plant assay systems, and methods of using rooted plant assay systems for high throughput screening of test polynucleotides for their ability to effect phenotypic traits having agricultural value.

Abstract: The present invention relates to a method for the production of transgenic plants and/or plant cells, respectively, with increased pathogen resistance, characterized in that a DNA sequence, which encodes a protein with the activity of a peroxidase, is inserted into the plant and expressed therein. The invention at hand also relates to the use of nucleic acids encoding a peroxidase for the production of transgenic plants, or plant cells, respectively, with increased pathogen resistance. Further, the invention at hand relates to nucleic acid sequences encoding a peroxidase of barley.

Abstract: The present invention relates to processes for preparing transformed plant cells or organisms by transforming a population of plant cells which comprises at least one marker protein having a direct or indirect toxic effect for the population, with at least one nucleic acid sequence to be inserted in combination with at least one compound, preferably a DNA construct, capable of reducing the expression, amount, activity and/or function of the marker protein, with the transformed plant cells having a growth advantage over nontransformed cells, due to the action of the compound.