1NSF Center for Engineering Plants for Resistance Against Pathogens (CEPRAP), University of California, Davis, One Shields Avenue, Davis 95616, U.S.A.; 2Department of Plant and Microbial Biology, University of California, Berkeley 94720; U.S.A.; 3Department of Vegetable Crops, University of California, Davis 95616, U.S.A.
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Accepted 2 February 2000.
AvrPto was introduced into three tomato genotypes with two biotic agents to study its role in compatible interactions. avrPto enhanced the capacity of the Pseudomonas syringae pv. tomato strain T1 to induce necrotic symptoms on tomato plants that lacked either Pto or Prf genes. The enhanced necrosis correlated with a small increase in bacterial growth. In planta expression of avrPto in isolation did not elicit necrosis in the absence of a functional Prf gene.
© 2000 The American Phytopathological Society