Función de la Lignina en la Interacción Planta-Nematodos Endoparásitos Sedentarios.

Sedentary endoparasitic nematodes introduce into their host, through its stylet, effector molecules that are previously synthesized in their esophageal glands, which induce reprogramming of gene expression in the host cells to promote changes in their metabolism, physiology and structure, necessary for the formation of the specialized feeding sites. The plant responds by expressing defense mechanisms such as the increase in the activity of key enzymes in the phenylpropanoid pathway, involved in the synthesis of secondary metabolites with antimicrobial properties and monomers that make up the lignin, which has a structural and defense roles in plants. The plantnematode interaction established (compatible or incompatible), will depend on whether the changes induced in the lignin synthesis are favorable or not for the differentiation of the specialized feeding site. The aim of this review is to present information on the biosynthesis, composition and deposition of lignin, as well as the updated knowledge on its role as a potential physical barrier against the establishment of phytonematodes in incompatible interactions and their possible participation in the formation of specialized feeding sites in compatible interactions. [ABSTRACT FROM AUTHOR]