Abstract
Summary A co-cultivation system has been developed in which in vitro cultured tomato cells derived from nearisogenic genotypes differing at the Ve locus are challenged with axenically grown Verticillium albo-atrum. In this system, a reduction in fungal growth is observed in the presence of Ve+ tomato cells, relative to growth in co-cultivation with Ve- tomato cells. Analysis of possible host defense mechanisms indicates that induction of phenylalanine ammonia-lyase activity and qualitative changes in the overall host phenolic profile may be involved. The pattern of pathogen biomass increase and induction of host tissue phenylpropanoid metabolism differ between the two genotypes in a manner consistent with expression of the Ve locus in vitro.
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