Contrasted responses of Botrytis cinerea isolates developing on tomato plants grown under different nitrogen nutrition regimes

摘要: The nutritional status of a plant is known to influence its susceptibility pathogens. In the case Botrytis cinerea, role nitrogen fertilization various host plants on disease development appears be variable. This study was carried out characterize possible variability associated with isolates and inoculum density B. cinerea in ability infect leaf-pruning wounds develop stem lesions tomato plants, as affected by input. Six differing their aggressiveness were compared. They all had similar reaction patterns vitro response differential levels. tests grown contrasted regimes nitrate fertilization, overall severity lower for higher inputs, regardless concentration. However, differences among observed effect nutrition infection lesion expansion. Disease onset delayed but greater tomato. highest contrast colonization stems. daily rate expansion decreased increasing levels more aggressive isolates, while it increased less isolate. Hypotheses explain these results are discussed light physiological effects nutrient availability pathogen tissue production defence metabolites plant.