Atributos funcionais da galha de enrolamento foliar em Myrcia splendens (Sw.) DC (Myrtaceae) induzida por Nexothrips sp. (Thysanoptera)

Abstract

Insect galls are specialized plant structures resulting from altered tissue growth and dif ferentiation induced by the activity of galling organisms. These structures serve as spe cialized microenvironments that provide physical protection, nutrient supply, and water regulation for the galling insect. Leaf-rolling galls induced by Nexothrips sp. on Myrcia splendens (Sw.) DC (Myrtaceae) offer a suitable model to investigate foliar structural changes under biotic stress. This study examined anatomical modifications in the epider mis and xylem of galled leaves, focusing on traits associated with water retention and vascular conduction. Variables analyzed included stomatal density, trichome density and types, cuticle thickness, and xylem structure along the leaf blade. Cuticle thickening and variations in stomatal and trichome density were observed, indicating adaptive epidermal responses to the gall microenvironment. Meanwhile, xylem anatomy remained functional and structurally preserved, suggesting continued vascular activity to support the gall's metabolic demands. These findings support the view that the gall functions as an auton omous organ capable of selectively modifying host leaf anatomy to meet the physiologi cal needs of the inducing insect.