Disease suppression by the cyclic lipopeptides iturin A and surfactin from Bacillus spp. against Fusarium wilt of lettuce

• Published in: Journal of general plant pathology : JGPP Vol. 85; no. 1; pp. 44 - 48
• Main Authors: Fujita, Shohei, Yokota, Kenji
• Format: Journal Article
• Language: English
• Published: Tokyo Springer Japan 01.01.2019; Springer Nature B.V
• Subjects: Agriculture; Bacillus; Biomedical and Life Sciences; Brassica; Cultivars; Disease Control; Fusarium; Fusarium oxysporum; Gene expression; Host plants; Iturin A; Lettuce; Life Sciences; Lipopeptides; Microbiology; Plant Pathology; Soil amendment; Surfactin; Vegetables; Wilt; Yellows; Iturin A; Lettuce; Surfactin; Lipopeptide
• ISSN: 1345-2630; 1610-739X
• DOI: 10.1007/s10327-018-0816-1

Iturin A and surfactin are antimicrobial cyclic lipopeptides secreted by antagonistic Bacillus strains, and both elicit defence gene expression in host plants. We previously showed that a soil amendment with either of the purified lipopeptides confers suppression against Fusarium yellows of tatsoi ( Brassica rapa ) caused by the soil-borne pathogen Fusarium oxysporum and that excess amounts of iturin A or surfactin do not confer suppression. Here, we evaluated the impacts of purified iturin A or surfactin against Fusarium wilt of lettuce ( Lactuca sativa ). As a soil amendment, iturin A and surfactin each conferred suppression of Fusarium wilt of lettuce on diverse lettuce cultivars similar to the results for tatsoi. However, higher concentrations of iturin A (1.88 mg/l of soil or higher) but not of surfactin (up to 7.5 mg/l of soil) negated the suppression. Growth of Fusarium in liquid cultures was suppressed by iturin A but not surfactin.