Volatiles produced by soil-borne endophytic bacteria increase plant pathogen resistance and affect tritrophic interactions
Volatiles produced by soil-borne endophytic bacteria increase plant pathogen resistance and affect tritrophic interactions
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DOI：
10.1111/pce.12220
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发表时间：
2014-04-01
影响因子：
7.3
通讯作者：
Turlings, Ted C. J.
中科院分区：
文献类型：
--
作者：
D'Alessandro, Marco;Erb, Matthias;Turlings, Ted C. J.
土壤微生物释放的挥发性有机化合物(VOCs)影响植物的生长和抗病性。然而，人们对它们对食草动物和更高营养水平的影响知之甚少。研究了一种主要的挥发性有机化合物--2，3-丁二醇(2，3-BD)的来源及其在植物生长、对病原菌和食草动物的抗性以及对玉米天敌的引诱等方面的作用。土壤玉米幼苗顶隙中2，3-丁二烯的主要贡献者之一被鉴定为产气肠杆菌，这是一种定植于植物体内的内生细菌。产气乳杆菌产生的2，3-BD使玉米植株对玉米叶枯病具有更强的抗性。相反，接种产气性肠杆菌的植株对斜纹夜蛾的抗性较弱。2，3-BD对寄生小蜂的引诱作用变化较大，2，3-BD喷施于植株顶端对寄生蜂的引诱作用不明显，但在土壤中施药可增加对寄生蜂的引诱作用。此外，接种产气性假单胞菌种子降低了对植物的吸引力，而接种土壤微生物总提取物的土壤则增加了对寄生蜂的吸引，这表明2，3-BD对寄生蜂的影响是间接的，并取决于微生物群落的组成。
Volatile organic compounds (VOCs) released by soil microorganisms influence plant growth and pathogen resistance. Yet, very little is known about their influence on herbivores and higher trophic levels. We studied the origin and role of a major bacterial VOC, 2,3-butanediol (2,3-BD), on plant growth, pathogen and herbivore resistance, and the attraction of natural enemies in maize. One of the major contributors to 2,3-BD in the headspace of soil-grown maize seedlings was identified as Enterobacter aerogenes, an endophytic bacterium that colonizes the plants. The production of 2,3-BD by E. aerogenes rendered maize plants more resistant against the Northern corn leaf blight fungus Setosphaeria turcica. On the contrary, E. aerogenes-inoculated plants were less resistant against the caterpillar Spodoptera littoralis. The effect of 2,3-BD on the attraction of the parasitoid Cotesia marginiventris was more variable: 2,3-BD application to the headspace of the plants had no effect on the parasitoids, but application to the soil increased parasitoid attraction. Furthermore, inoculation of seeds with E. aerogenes decreased plant attractiveness, whereas inoculation of soil with a total extract of soil microbes increased parasitoid attraction, suggesting that the effect of 2,3-BD on the parasitoid is indirect and depends on the composition of the microbial community.