IDENTIFICATION AND MAP LOCATION OF RESISTANCE LOCI IN ARABIDOPSIS THALIANA THAT CONFER RESISTANCE TO DIFFERENT STRAINS OF RALSTONIA SOLANACEARUM
L DESLANDES1, L GODIARD1, L SAUVIAC1, I ROGISTER1, S CAMUT1, E HOLUB2, J BEYNON2, M ARLAT1 and Y MARCO1
1Laboratoire de Biologie Moleculaire des Relations Plantes/Micro-organismes CNRS-INRA, BP 27, 31326 Castanet-Tolosan, France; 2Department of Plant Genetics and Biotechnology, Horticulture Research International, Wellesbourne, Warwick, CV34 9EF, UK
Background and objectives
Results and conclusions
Altogether, these data suggest the existence of several loci governing resistance to bacterial wilt in Arabidopsis. Genetic analysis of segregating populations generated from crosses between susceptible and resistant ecotypes indicated that a single recessive locus in Nd-1 confers resistance to strain GMI1000. F8 recombinant inbred lines generated between the two ecotypes Col-5 and Nd-1 were used to map this disease resistance locus, RRS1, on chromosome V. In addition, resistance to strain 14.25 was shown to be conferred by a major locus, RRS2, present on chromosome II. The fine mapping of these loci will be presented.
Our data demonstrate that the interactions between Arabidopsis and R. solanacearum constitute a novel model system to study the genetic and molecular basis of plant-pathogen recognition.