Host and biotic factors affecting sporulation ofstemphylium botryosum f. sp. lycopersici on tomatoes and ofalternaria porri f. sp. sol ani on potatoes

Autor: Esther Bashi, J. Rotem
Rok vydání: 1975
Předmět:
Zdroj: Phytoparasitica. 3:27-38
ISSN: 1876-7184
0334-2123
Popis: Factors known to inhibit sporulation of bio trophic fungal pathogens were found to enhance sporulation of two necrotrophic fungi. The sporulating potential ofStemphyliurn botryosum f. sp.lycopersici on tomatoes and ofAlternaria porri f. sp.solani on potatoes increased with necrotization, reaching a maximum on dead leaves. Wetting the dead leaves for the whole period of incubation with increasing concentrations of glucose resulted in progressively decreasing sporulation of both pathogens. However, application of glucose during the first half of the incubation period inhibited sporulation ofS. botryosum f. sp.lycopersici on tomatoes only a little, and increased that ofA. porri f. sp.solani on potatoes. The capacity ofS. botryosum f. sp.lycopersici to sporulate on leaves lasted for 12 weeks at 29°C, and ofA. porri f. sp.solani for 12 weeks at 29°C and for over 21 weeks at 20°C. The results emphasized basic differences in sporulation between biotrophic and necrotrophic parasites. Specific techniques useful for studying sporulationin vivo are discussed.
Databáze: OpenAIRE
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