More than 200 yeasts were selectively isolated from microbial populations on the surface of different fruits. Fifty of these isolates were tested against blue mould (Penicillium expansum) on wounded apples. isolates LS-11 of Rhodotorula glutinis and LS-28 of Cryptococcus laurentii were rite most effective antagonists. They were further evaluated at 20 degrees C on different fruits (apples, pears, strawberries, kiwi fruits find table grapes) against several of the main post-harvest pathogens (Botrytis cinerea, Penicillium expansum, Rhizopus stolonifer and Aspergillus niger) and at 4 degrees C on apples inoculated with P. expansum. At 20 degrees C the antagonists significantly reduced rot incidence and showed a wide range of activity on different host-pathogen combinations, isolate LS-28 exhibited a higher and more stable activity than LS-11. Both yeasts were also effective against P. expansum in cold storage conditions. Populations of the two yeasts were assessed on wounded and unwounded surfaces of apples kept at both 20 and 4 degrees C. At either temperature, isolate LS-28 reached greater densities in wounded tissues than LS-11, but had a lower ability to colonize unwounded apple skin. The two yeasts were able to grow in culture at temperatures ranging from 0 to 35 degrees C. In assays performed in vitro at 24 degrees C, the antagonists showed low sensitivity towards several fungicides commonly applied on fruits and vegetables.
Activity of the yeasts Cryptococcus laurentii and Rhodotorula glutinis against post-harvest rots on different fruits
LIMA, Giuseppe;DE CURTIS, Filippo;CASTORIA, Raffaello;
1998-01-01
Abstract
More than 200 yeasts were selectively isolated from microbial populations on the surface of different fruits. Fifty of these isolates were tested against blue mould (Penicillium expansum) on wounded apples. isolates LS-11 of Rhodotorula glutinis and LS-28 of Cryptococcus laurentii were rite most effective antagonists. They were further evaluated at 20 degrees C on different fruits (apples, pears, strawberries, kiwi fruits find table grapes) against several of the main post-harvest pathogens (Botrytis cinerea, Penicillium expansum, Rhizopus stolonifer and Aspergillus niger) and at 4 degrees C on apples inoculated with P. expansum. At 20 degrees C the antagonists significantly reduced rot incidence and showed a wide range of activity on different host-pathogen combinations, isolate LS-28 exhibited a higher and more stable activity than LS-11. Both yeasts were also effective against P. expansum in cold storage conditions. Populations of the two yeasts were assessed on wounded and unwounded surfaces of apples kept at both 20 and 4 degrees C. At either temperature, isolate LS-28 reached greater densities in wounded tissues than LS-11, but had a lower ability to colonize unwounded apple skin. The two yeasts were able to grow in culture at temperatures ranging from 0 to 35 degrees C. In assays performed in vitro at 24 degrees C, the antagonists showed low sensitivity towards several fungicides commonly applied on fruits and vegetables.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
