Abstract
Factor analysis of correspondences demonstrated that leeksAllium porrum L. change their reproductive behavior as a function of the level of attack by a phytophagous insect. Attack on one leaf may lead to the development of the flower stem of the subaxillary bulb, with no changes in sexual reproduction. Moderate defoliation results in a greater level of sexual reproduction than in control plants. Attack on all leaves without terminal meristem produces bulblets in inflorescence, but with reduced seed production. These results illustrate the occasionally positive role of consumers on producers, e.g. the stimulation of sexual reproduction, as well as the hypothesis of adaptive co-evolution of the plant and its consumer.
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