农业生产力依赖于植物对害虫的抗性,硅(Si)越来越被认为是一种重要的抗草食动物防御。然而,Si抵消昆虫伤害影响的过程尚未完全了解。Si在减轻食草动物不利影响中的作用已在各种作物的物种水平上进行了大量研究,忽略基因型水平的敏感性和变异性。理解跨基因型的这种变异是重要的,因为Si衍生的益处与植物中积累的Si的量相关。因此,本研究旨在研究不同Si浓度(0、125和250mgL-1)对使用两种小麦基因型(WW-101和SW-2)在草食性的条件下对Si积累和植物生长的影响。48小时。较高的Si吸收增加了叶片叶绿素的浓度,类胡萝卜素,可溶性糖,和蛋白质。更高浓度的硅应用增加了干重,抗氧化酶活性,总酚类物质,黄酮和芽Si浓度,虽然它减少了电解质泄漏,过氧化氢(H2O2)和丙二醛(MDA)水平,从而防止叶片损坏。我们推断,较高的Si浓度通过改善次生代谢产物的积累和增强抗氧化防御系统来减轻小麦草食性的不利影响。对于大多数研究性状,基因型\'WW-101\'与\'SW-2\'相比,表明整体应激反应是基因型依赖性的。因此,在制定有效的作物管理策略时,应考虑基因型的Si获取效率。
Agricultural productivity relies on plant resistance to insect pests, with silicon (Si) being increasingly recognized as an important anti-herbivore defense. However, the processes by which Si works to counteract the effects of insect injury are not completely understood. The role of Si in mitigating the adverse effects of
herbivory has been mostly studied at the species level in various crops, ignoring the sensitivity and variability at the genotypic level. Understanding such variation across genotypes is important because Si-derived benefits are associated with the amount of Si accumulated in the plant. Therefore, the present investigation was pursued to
study the effect of different Si concentrations (0, 125, and 250 mg L⁻1) on Si accumulation and plant growth using two wheat genotypes (WW-101 and SW-2) under grasshopper
herbivory for 48 h. The higher Si absorption increased the concentration of leaf chlorophyll, carotenoids, soluble sugars, and proteins. Silicon application at higher concentrations increased the dry weight, antioxidant enzyme activity, total phenolics, flavonoids and shoot Si concentration, whereas it decreased the electrolyte leakage, hydrogen peroxide (H2O2) and malonaldehyde (MDA) levels, thereby preventing leaf damage. We infer that the higher Si concentration alleviates the adverse effects of
herbivory in wheat by improving the accumulation of secondary metabolites and enhancing the antioxidant defense system. The effects were pronounced in the genotype \'WW-101\' compared to \'SW-2\' for most of the studied traits, indicating overall stress response to be genotype-dependent. Thus, Si acquisition efficiency of genotypes should be considered while developing efficient crop management strategies.