Disease suppression by the cyclic lipopeptides iturin A and surfactin from Bacillus spp. against Fusarium wilt of lettuce
Disease suppression by the cyclic lipopeptides iturin A and surfactin from Bacillus spp. against Fusarium wilt of lettuce
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DOI：
10.1007/s10327-018-0816-1
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发表时间：
2019-01-01
影响因子：
1.2
通讯作者：
Yokota, Kenji
中科院分区：
文献类型：
--
作者：
Fujita, Shohei;Yokota, Kenji
Iturin A和surfactin是由拮抗芽孢杆菌分泌的抗菌性环脂肽，它们都能诱导宿主植物中防御基因的表达。我们以前表明，任何一种纯化的脂肽的土壤改良剂赋予抑制对镰刀菌黄化的tatarum（芜菁）引起的土传病原体尖孢镰刀菌和过量的伊枯草菌素A或表面活性素不赋予抑制。在这里，我们评估了纯化的伊枯草菌素A或表面活性素对莴苣枯萎病的影响。作为一种土壤改良剂，iturin A和surfactin各自赋予不同的生菜品种的生菜枯萎病的抑制类似的结果，为tattera。然而，较高浓度的伊枯草菌素A（1.88毫克/升土壤或更高），但不是表面活性素（高达7.5毫克/升土壤）否定的抑制。镰刀菌在液体培养基中的生长受到伊枯草菌素A的抑制，但不受表面活性素的抑制。
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 (1.88mg/l of soil or higher) but not of surfactin (up to 7.5mg/l of soil) negated the suppression. Growth of Fusarium in liquid cultures was suppressed by iturin A but not surfactin.