Abstract

Silicon (Si) has a physical barrier effect on plant tissues, decreasing nematode infection in different crops. Notwithstanding, research on lettuce is lacking, especially regarding the chemical mechanisms of action of this beneficial element. This study evaluated the effect of Si supply on lettuce plants infested with 0, 6000, and 12,000 eggs and second stage juveniles of Meloidogyne incognita, both in the absence and in the presence of Si (2 mM) in the nutrient solution. Silicon increased phenolic compounds and ascorbic acid, reducing M. incognita population and decreasing oxidative stress. The element also increased chlorophyll content and the quantum efficiency of photosystem II (FV/FM), favoring lettuce growth and production. The use of Si decreased the number of nematodes and affected their reproduction, decreasing the number of eggs and galls on lettuce roots. This indicates that Si may serve as a sustainable alternative for the control of M. incognita. The benefit of using Si appears to be due to the combined effect chemical action from the increase in phenolic compounds and ascorbic acid in plant tissues, improving plant physiology.

Graphical abstract

中文翻译：

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硅通过增加抗坏血酸和酚类化合物促进生菜中南方根结线虫的控制

摘要

硅 (Si) 对植物组织具有物理屏障作用，可减少不同作物的线虫感染。尽管如此，缺乏对生菜的研究，特别是关于这种有益元素的化学作用机制。本研究评估了在营养液中不存在和存在 Si (2 mM) 的情况下，Si 供应对感染了 0、6000 和 12,000 个卵以及第二阶段的南方根结线虫幼体的莴苣植物的影响。硅增加酚类化合物和抗坏血酸，减少M. incognita人口和减少氧化应激。该元素还增加了叶绿素含量和光系统 II (FV/FM) 的量子效率，有利于生菜的生长和生产。硅的使用减少了线虫的数量并影响了它们的繁殖，减少了莴苣根上的卵和虫瘿的数量。这表明 Si 可以作为控制M. incognita的可持续替代品。使用 Si 的好处似乎是由于植物组织中酚类化合物和抗坏血酸的增加所产生的综合化学作用，从而改善了植物生理机能。

图形概要