บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Integrated control of postharvest citrus decay and induction of phytoalexins by Debaryomyces hansenii.

Arras, G.; Arru, S.;

Advances in Horticultural Science Year: 1999 Vol: 13 Issue: 2 Pages: 76-81 Ref: 21 ref.

1999

บทคัดย่อ

Integrated control of postharvest citrus decay and induction of phytoalexins by Debaryomyces hansenii.

The mode of action is reported of the yeast Debaryomyces hansenii (strain 43E), isolated from fig fruits, which was able to inhibit the development of Penicillium digitatum (96-100% inhibition), P. italicum (89-91%) and Botrytis cinerea (90-98%) on artificially wounded orange and satsuma fruits. Strain 43E did not produce toxic substances against the pathogens and it grew rapidly at the wound site (100 times in 24 h). Moreover, the yeast elicited the production of phytoalexins, scopoletin and scoparone, as determined by TLC and HPLC analyses. Scoparone reached fungitoxic levels at the wound site 48 h after inoculation. The yeast was resistant to 5 g thiabendazole (TBZ)/litre and to 0.2 g imazalil/litre, and it could grow in the wound even in the presence of 0.2 g TBZ/litre. The ability to apply the yeast together with TBZ to reduce P. digitatum decay on artificially wounded orange fruits demonstrated the feasibility of integrated control which would allow a reduction in the dose of TBZ commonly

used as well as a reduction in the number of yeast cells inoculated.