Journal
CROP PROTECTION
Volume 103, Issue -, Pages 1-8Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2017.09.002
Keywords
Acetophenone; Biocontrol; Colletotrichum spp.; Phenylethyl alcohol; Streptomyces philanthi
Categories
Funding
- Thailand Research Fund [RTA6080010]
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Application of volatiles from Streptomyces philanthi RM-1-138 grown on sterile wheat seeds (volatiles RM-1-138) and pure commercial volatile compounds (acetophenone and phenylethyl alcohol) against chili anthracnose pathogen were investigated in vitro and in vivo. Among 42 isolates of Colletotrichum species tested, C gloeosporioides PSU-NY8 was selected as the most aggressive anthracnose pathogenic strain on chili fruit against the volatiles RM-1-138. The optimum inoculum size (15 g L-1) and spore concentration (107 spore mL(-1)) of the wheat seed culture of S. philanthi RM-1-138 exhibited the complete suppression (100% inhibition) on C gloeosporioides PSU-NY8. In addition, the in vivo result indicated the optimum fumigation period of the volatiles RM-1-138 (15 g L-1) was at 6 h. Phenylethyl alcohol showed no antifungal activity at all concentrations tested (10-1000 1.1 L-1) while acetophenone at 100 1.11 L-1 of airspace exhibited antifungal activity both in vitro and in vivo after 12 h fumigation. The fumigant activity was evidenced by the damage of cell wall of C gloeosporioides PSU-NY8 illustrated by SEM. Therefore, the volatiles from S. philanthi RM-1-138 have a high potential for biocontrol of chili anthracnose disease in postharvest system. (C) 2017 Elsevier Ltd. All rights reserved.
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