Dedifferenzierung der Appressorien von Botrytis cinerea Pers. unter Bildung von Mikrokonidien — Relation zur Resistenz von Lycopersicon spp. gegen B. cinerea
1985
Urbasch, I.
Dedifferentiation of the appressoria of Botrytis cinerea Pers. by formation of microconidia — Relation to resistance of Lycopersicon spp. to B. cinerea The dedifferentiation of the appressoria of Botrytis cinerea Pers. by formation of microconidia on cultivated and wild tomato plants (Lycopersicon esculentum, L. hirsutum, L. glandulosum, L. peruvianum) and on artificial surfaces (cover‐glasses) was investigated. The dedifferentiation proceeded by production of microconidia directly on the appressoria or by terminally and laterally outgrowing hyphae and their subsequent formation of microconidia. After inoculation of Lycopersicon spp. with B. cinerea the intensity of the appressoria dedifferentiation was directly and positively correlated with the degree of resistance of the plants. The appressoria lost their function and the infection process at the site of interaction was interrupted. Microconidia thus formed were not capable of germination and infection under the present conditions. The dedifferentiation of the appressoria on cover‐glasses was induced by nutritional defiency or complete lack of nutrients. The intensity and rapidity of the dedifferentiation process was modified under the influence of exogenous factors (humidity, temperature, light, concentration of oxygen). It is discussed in how far the induction of the appressoria dedifferentiation in B. cinerea on resistant Lycopersicon spp. is likewise caused by low concentrations of nutrients on or in the plants.
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