INVESTIGATIONS ON THE MOLECULAR BACKGROUN D OF PLANT-PATHOGEN INTERACTIONS OPEN UP NEW PROSPECTS TO RESISTANCE BREEDING .2. RESISTANCE GENES, TRANSGENIC PLANTS

In the last few years a new era has been set up in investigations focu sed on the host-pathogen interrelationships. A growing body of informa tion has now been available on the molecular genetic background of rec ognition, pathogenicity and host plant resistance. Novel strategies of resistance breeding based on transgenic plants transformed by resista nce genes of plant or microbe origin are being borne. The present stud y aims to give a survey of available cloned genes that code for virule nce or avirulence of pathogenic microorganisms (first part) and confer resistance or susceptibility of the host plants (this part). Special attention is given for those attempts that purport the engineering of novel-type plant resistance by introducing alien genetic sequences.