Abstract
The role of morphological characteristics of tomato leaves in the infection process of the pathogen Pseudomonas syringae pv. tomato was studied in 15 cultivars of varying susceptibility. Natural openings such as stomata, broken trichomes and cuticular cracks were counted. It was found that susceptibility increased in proportion to the number of these potential penetration sites. However, their role is probably limited because even in the highly resistant cultivars there are enough natural openings to enable successful bacterial penetration.
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