Abstract
Resistance of plants to bacterial pathogens is often controlled by corresponding genes for resistance and avirulence in host and pathogen, respectively. Fifty years after discovery of the genetic basis of gene-for-gene interactions, several avirulence and plant resistance genes have been isolated and are being studied on the molecular level. Tremendous progress has been made due to a better understanding of type III secretion systems that are required for bacterial pathogenicity. We are beginning to grasp how the plant actually recognizes bacterial avirulence determinants. The current view is that the bacterium translocates avirulence proteins into the host cell by the Hrp type III secretion system and that recognition occurs in the plant cell.
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