Aroma volatiles as modulators of postharvest mold development on fruit: in vivo role and fumigation tools.
Archbold, D. D.; Hamilton-Kemp, T. R.; Fallik, E.;
Acta Horticulturae Year: 2000 Issue: No. 518 Pages: 87-92 Ref: 14 ref.
2000
บทคัดย่อ
In in vitro bioassays, the presence of ripe strawberry and blackberry fruits adjacent to agar media inoculated with Botrytis cinerea spores influenced germ tube elongation within 24 h. With strawberry, germ tube elongation increased if fruits were present, while germ tube elongation was both promoted and inhibited with blackberry depending on fruit proximity to the fungal culture. The lipoxygenase-lyase product (E)-2-hexenal, a volatile component of many fruits, especially after wounding, has been implicated in plant pathogen defense and observed to inhibit B. cinerea spore germination and both inhibit and promote germ tube elongation in a concentration-dependent manner. This inhibitory effect was studied as a potential technique for controlling mould development on fruits during postharvest storage. The compound (100 ml of liquid) was placed in 1-litre low density film-wrapped clamshell containers with 150 g of fruit and stored at 2 deg C for 7 days. Following removal of the over-wrapped film a
nd chemical from the containers and transfer to 20 deg C, mould development was reduced on blackberry (cv. Chester Thornless) fruits. Mould was also reduced on grapes (cv. Flame Seedless) at 20 deg C following 14 days of exposure to (E)-2-hexenal in 2 deg C storage. Differences in metabolism of (E)-2-hexenal among the species and the resulting headspace concentrations may partly explain the dissimilar responses. It is suggested that further development of an understanding of the role of aroma volatiles in plant-pathogen interactions could lead to identification of other natural volatile compounds with antifungal activity and biologically-based techniques to control mould during storage.