Transgenic potato plants resistant to the phytopathogenic bacterium Erwinia carotovora

The phytopathogenic bacterium Erwina carotovora spp. which infects potato plants causes severe losses in agriculture. No protective means or resistance traits usable for plant breeding are known. Introduction of a new resistance gene into potato by gene technology leads to a reduced susceptibility of the transgenic plants towards Erwinia carotovora atroseptica infection. Bacteriophage T4 lysozyme is the most active member of a class of bacteriolytic enzymes also detected in several plant species. Secretion of the foreign T4 lysozyme into the intercellular spaces of transgenic potato plants effects a resistance against the phytopathogenic bacterium already at low expression levels.