Research in Plant Disease 2010;16(2):163-169.
Published online August 30, 2010.
마늘 푸른곰팡이병 방제용 Pantoea agglomerans 59-4의 억제기작 해석
김용기, 권미경, 예완해, 홍성준, 지형진, 박종호, 한은정, 박경석, 이상엽, 이승돈
Elucidation of Mode of Action of Pantoea agglomerans 59-4 for Controlling Garlic Blue Mold
Yong Ki Kim, Mi Kyung Kwon, Wan Hae Yeh, Sung Jun Hong, Hyung Jin Jee, Jong Ho Park, Eun Jung Han, Kyung Seok Park, Sang Yeob Lee, Seong Don Lee
To screen for potential biocontrol agents against postharvest disease of garlics caused by Penicillium hirsutum, a total of 1292 isolates were isolated from the rhizoshere or rhizoplane of Allium species. Among them, S59-4 isolate was selected as a potential biocontrol agent by in vivo wounded garlic bulb assay. The isolate was identified as Pantoea agglomerans (Pa59-4) through Biolog system. Pa59-4 did not inhibit the mycelial growth of P. hirsutum in dual-culture with P. hirsutum on tryptic soy agar. In order to elucidate mode of action of Pa59-4 on biological control, nutrient competition between Pa59-4 and P. hirsutum was investigated by the simple method using tissue culture plates with cylinder inserts containing defusing membrane reported by Janisiewicz et al. (2000). The results showed that Pa59-4 effectively suppressed spore germination and mycelial growth of blue mold in the low concentration (0.5%) of garlic juice, but it did not suppress those of blue mold in the high concentration (5%) of garlic juice. This result suggests that the mechanism in biocontrol of garlic blue mold by Pa 59-4 may be involved in nutrient competition with P. hirsutum on garlic bulbs.
Key Words: Garlic blue mold, Nutrient competition, Pantoea agglomerans 59-4, Postharvest disease
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