ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Activity of the yeasts Cryptococcus laurentii and Rhodotorula glutinis against post-harvest rots on different fruits.

Lima, G.; Curtis, F. de; Castoria, R.; Cicco, V. de;

Biocontrol Science and Technology Year: 1998 Vol: 8 Issue: 2 Pages: 257-267 Ref: 27 ref.

1998

บทคัดย่อ

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) of wounded apples. Isolates LS-11 of Rhodotorula glutinis and LS-28 of Cryptococcus laurentii were the most effective antagonists. They were further evaluated at 20 deg C on different fruits (apples, pears, strawberries, kiwi fruits and table grapes) against several of the main post-harvest pathogens (Botrytis cinerea, Penicillium expansum, Rhizopus stolonifer and Aspergillus niger) and at 4 deg on apples inoculated with P. expansum. At 20 deg , the antagonists significantly reduced rot incidence and showed a wide range of activity on different host-pathogens 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 2 yeasts were assessed on wounded and unwounded surfaces of apples kept a

t both 20 and 4 deg . 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 2 yeasts were able to grow in culture at temperatures ranging from 0 to 35 deg . In assays performed in vitro at 24 deg , the antagonists showed low sensitivity towards several fungicides commonly applied on fruits and vegetables.