ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Prestorage heat treatment reduces pathogenicity of Penicillium expansum in apple fruit.

Fallik, E.; Grinberg, S.; Gambourg, M.; Klein, J. D.; Lurie, S.;

Plant Pathology Year: 1996 Vol: 45 Issue: 1 Pages: 92-97 Ref: 19 ref.

1996

บทคัดย่อ

P. expansum is one of the main postharvest pathogens of apples in Israel. Heating apples inoculated with the fungus for 96 h at 38 deg C completely inhibited disease development. Fruit held for 24 h at 42 deg C or for 12 h at 46 deg C showed reduced decay after an additional 14 days incubation at 20 deg C, compared with untreated fruit. Mycelial growth and percentage spore germination in vitro were inversely proportional to length of time of exposure to various temperatures. The ET50s for spore germination were 42, 34 and 20 h at 38, 42 and 46 deg C, resp. The ET50s for mycelial growth were 48, 44 and 36 h, resp. When spores were incubated on crude extract from apple peel held for 4 days at 38 deg C, germ tube elongation was reduced and germ tube walls were thicker compared with germ tubes from spores on extracts from untreated fruits. It is suggested that this supports the hypothesis that the effect of heating is not only the result of direct inhibition of fungal germination and growth by high

temperature, but is also partly due to the formation of an inhibitory substance in the heated peel.