Changes in tolerance and resistance of a plant to insect herbivores under variable water availability
Changes in tolerance and resistance of a plant to insect herbivores under variable water availability
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DOI：
10.1016/j.envexpbot.2020.104334
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发表时间：
2021-03
影响因子：
5.7
通讯作者：
Po-An Lin;Sulav Paudel;Amin Afzal;Nancy L. Shedd;G. Felton
中科院分区：
文献类型：
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作者：
Po-An Lin;Sulav Paudel;Amin Afzal;Nancy L. Shedd;G. Felton
水分供应是影响植物-昆虫相互作用的重要因素。虽然水分限制对植物抗性性状的影响受到了很多关注，但水分供应如何影响植物对植食动物的耐受性却很少被测试。在这里，我们表明，较低的水的可用性降低了番茄植株的耐受能力，通过地上再生和花的发育后，食草动物。与降低的耐受草食动物的能力相反，较低的水分供应增加了两种防御蛋白，胰蛋白酶蛋白酶抑制剂和多酚氧化酶的组成和诱导水平，表明在水分限制下增加了对抗性的投资。防御蛋白质的增加与专业毛毛虫Manduca sexta的较低性能和较低的植物组织消耗有关。尽管多功能型棉铃虫的表现不受水分供应的影响，但我们观察到了高死亡率。表明番茄对H.玉米这些发现揭示了一个意想不到的情况，即水分限制降低了植物的耐受性，但增加了植物的抗性，这表明这些策略之间存在潜在的权衡。这种可塑性可能有利于草本植物在可变的水分供应下平衡生长和防御。
Water availability is an important factor that influences plant-insect interactions. While the influence of water limitation on plant resistance traits has received much attention, how water availability affects plant tolerance to herbivory is rarely tested. Here we show that lower water availability reduced tolerance capacity of tomato plants as measured by above ground regrowth and flower development after herbivory. In contrast to a reduced ability to tolerate herbivory, lower water availability increased the constitutive and induced levels of two defensive proteins, trypsin protease inhibitor and polyphenol oxidase, indicative of an increased investment on resistance under water limitation. The increase in defense proteins was paralleled with lower performance of a specialist caterpillar,Manduca sexta,and lower consumption of plant tissues. Although the performance of generalist,Helicoverpa zea, was unaffected by water availability, we observed a high mortality ofH. zeathat suggests strong resistance of tomato againstH. zea. The findings revealed an unexpected case where water limitation decreases tolerance but increases resistance of a plant, suggesting a potential tradeoff between these strategies. This plasticity may benefit herbaceous plants by balancing growth and defense under variable water availability.