Abstract
We are currently developing three model plant-bacterial interactions that will allow us to answer specific questions concerning the molecular basis of disease resistance and genetic mechanisms involved in pathogen mutation to overcome host resistance. We are studying the interaction of Pseudomonas syringae pv. tomato (Pst) with Arabidopsis thaliana and Lycopersicon esculentum (tomato) with the goal of cloning corresponding avirulence-resistance gene pairs that specify disease resistance. We have demonstrated that certain strains of Pst can cause disease on both hosts while others are only capable of causing disease on specific ecotypes of A. thaliana or cultivars of tomato. Two avirulence genes have been cloned and characterized from Pst that correspond to two genetically characterized resistance genes in both tomato and A. thaliana.. Pst strains carrying the avirulence gene avrPto are avirulent on tomato cultivars carrying the resistance gene Pto, while Pst strains harboring the avrRpt2 gene are avirulent on A. thaliana ecotypes containing the corresponding gene Rpt2. Finally, we have demonstrated that the avirulence gene avrBs2 from Xanthomonas campestris pv. vesicatoria is involved in the fitness of the pathogen and may explain why the corresponding pepper resistance gene Bs2 seems to stable under natural field conditions.
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Bent, A. et al. (1991). Gene-For-Gene Relationships Specifying Disease Resistance in Plant-Bacterial Interactions. In: Hennecke, H., Verma, D.P.S. (eds) Advances in Molecular Genetics of Plant-Microbe Interactions Vol. 1. Current Plant Science and Biotechnology in Agriculture, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7934-6_5
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DOI: https://doi.org/10.1007/978-94-015-7934-6_5
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