Experimental evidence that plants under caterpillar attack may benefit from attracting parasitoids
Experimental evidence that plants under caterpillar attack may benefit from attracting parasitoids
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发表时间：
2001
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通讯作者：
Maria Elena Hoballah;T. C. Turlings
中科院分区：
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作者：
Maria Elena Hoballah;T. C. Turlings
植食性昆虫诱导的植物挥发物被认为是吸引植食性昆虫天敌的间接防御信号。已知有几种昆虫拟寄生蜂利用这种植物提供的线索来定位宿主。目前还不清楚是否个别植物受益于拟寄生蜂的行动。我们调查了这个问题，在玉米植株的攻击下，由Spodoptera littoralis幼虫，并发现，寄生内寄生Cotesia marginiventris和Campoletis sonorensis显着降低饲养和体重增加的主机幼虫。结果，被单个寄生幼虫攻击的玉米幼苗遭受的摄食损害要少得多，并且成熟时比被未寄生幼虫攻击的植物多产生约30%的种子。这种健身的好处可能有助于选择压力，塑造了草食动物诱导的间接防御信号在植物中的演变。
Herbivore-induced plant volatiles have been suggested to function as indirect defence signals that attract natural enemies of herbivores. Several insect parasitoids are known to exploit such plant-provided cues to locate hosts. It is unclear if individual plants benefit from the action of parasitoids. We investigated this question in maize plants under attack by Spodoptera littoralis larvae and found that parasitization by the endoparasitoids Cotesia marginiventris and Campoletis sonorensis significantly reduced feeding and weight gain in the host larvae. As a result, young maize plants attacked by a single parasitized larva suffered much less feeding damage and, at maturity, produced about 30% more seed than plants that were attacked by an unparasitized larva. Such fitness benefits may have contributed to selection pressures that shaped the evolution of herbivore-induced indirect defence signals in plants.