Mode of Action of Phytochemicals During Physiological and Biochemical Interactions with Nematodes

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The proliferation of plant-parasitic nematodes as formidable agricultural pests poses a significant global threat to crop productivity. Despite their diminutive size, these organisms inflict substantial economic losses, with global damage surpassing that caused by insect pests. The cryptic nature of nematode infections renders them particularly insidious, often leading to underestimation and inadequate management. Beyond their intrinsic harmful effects, plant-parasitic nematodes exacerbate crop damage by forming synergistic disease complexes with other pathogenic microorganisms. Nematodes utilize diverse strategies to breach plant host tissues, with a particular emphasis on the root-knot and cyst-forming nematodes—two prominent groups that inflict severe agricultural damage. The evolution of plant defense mechanisms is an intrinsic biological response by which plants counteract nematode parasitism. Plants deploy receptor molecules against nematode effectors, facilitating resistance by either preventing nematode penetration or by producing nematicidal proteins that mitigate nematode pathogenicity. The activation of plant defense-related genes and the synthesis of defensive hormones are pivotal in enhancing plant resilience against nematode invasion. However, under certain conditions, these defensive strategies may inadvertently augment nematode parasitism. Common symptoms indicative of nematode infestation include tissue necrosis, gall formation, cyst development, and stunted plant growth. This chapter delves into the current understanding of plant-nematode interactions, emphasizing the molecular and physiological mechanisms underpinning plant immune responses to nematode invasion.&nbsp;