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Xv4-vrxv4: a new gene-for-gene interaction identified between Xanthomonas campestris pv. vesicatoria race T3 and wild tomato relative Lycopersicon pennellii.
Molecular Plant-microbe Interactions : MPMI 2000 December
Strains of tomato race 3 (T3) of Xanthomonas campestris pv. vesicatoria elicit a hypersensitive response (HR) in leaves of Lycopersicon pennellii LA716. Genetic segregation of the resistance exhibited ratios near 3:1 in F2 populations, which confirmed that a single dominant gene controlled the inheritance of this trait. With the aid of a collection of introgression lines, restriction fragment length polymorphism, and cleaved amplified polymorphic sequence markers, the resistance locus was located on chromosome 3 between TG599 and TG134. An avirulence gene named avrXv4 was also isolated by mobilizing a total of 600 clones from a genomic DNA library of the T3 strain 91-118 into the X. campestris pv. vesicatoria strain ME90, virulent on L. pennellii. One cosmid clone, pXcvT3-60 (29-kb insert), induced HR in resistant plants. The avirulent phenotype of pXcvT3-60 was confirmed by comparing growth rates in planta and electrolyte leakages among transconjugants carrying a mutated or intact clone with the wild-type T3 strain 91-118. A 1.9-kb DNA fragment contained within a 6.8-kb active subclone was sequenced and was determined to carry an open reading frame of 1,077 bp. The predicted AvrXv4 protein exhibits high similarity to members of an emerging new family of bacterial proteins from plant and mammalian pathogens comprising AvrRxv, AvrBsT, YopJ, YopP, AvrA, and YL40.
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