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Nitrogen and water availability to tomato plants triggers bottom-up effects on the leafminer Tuta absoluta

机译:番茄植物的氮和水利用率触发了对切叶机Tuta absoluta的自下而上的作用

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摘要

This study examined the effects of various levels of nitrogen inputs (optimal, insufficient and excessive) and water inputs (optimal, low drought and high drought) to tomato plants (Solanum lycopersicum) on survival and development of an invasive tomato leafminer, Tuta absoluta (Meytick) (Lepidoptera: Gelechiidae). Plant growth i.e. plant height and the number of nodes declined under insufficient or excessive nitrogen treatment. Compared to optimal N, insufficient N treatment decreased leaf N content and increased the carbonitrogen ratio (C/N) whereas an excess of N had no effect on both leaf N content and leaf C/N ratio. Sub-optimal nitrogen supplies, water treatments and their interactions, significantly reduced the leafminer survival rate and slowed down its development. Together with the findings from three recent companion studies, we assumed that a combination of changes in nutritional value and chemical defense could explain these observed effects. Furthermore, our findings supported both the “Plant vigor hypothesis” and the “Nitrogen limitation hypothesis”.
机译:这项研究调查了番茄(Solanum lycopersicum)不同水平的氮输入(最佳,不足和过量)和水输入(最佳,低干旱和高干旱)对入侵性番茄切叶机Tuta absoluta( Meytick)(鳞翅目:G科)。在氮肥处理不足或过量的情况下,植物生长,即株高和节数减少。与最佳氮素相比,氮素处理不足会降低叶片氮素含量并增加碳/氮比(C / N),而过量氮素对叶片氮素含量和叶片碳氮比均无影响。次优的氮供应,水处理及其相互作用,大大降低了挖矿机的存活率并减慢了其发展。结合最近三项伴随研究的发现,我们认为营养价值和化学防御作用的综合变化可以解释这些观察到的影响。此外,我们的发现支持“植物活力假说”和“氮限制假说”。

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