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Herbicide clomazone is highly soluble in water, which increases the risk of leaching, resulting in contamination of sources of groundwater and waterways, affecting non-target organisms, with possible degradation of riparian areas. The objective of this work was to investigate the possible anatomical modifications of the leaf tissue of twelve arborescent species native to Brazil grown in soil contaminated by clomazone, in order to microscopically characterize leaf damage caused by the herbicide, and investigate whether the structural damage precedes visible damage. Through micro morphometrics, the thickness and the area occupied by the tissues were measured in a cross section of the leaves of the forest species: adaxial and abaxial epidermis, palisade and spongy parenchyma. It has been found that the species evaluated were affected by the presence of the pesticide in the soil, and the variable with the largest negative changes was the spongy parenchyma. Among the species, Inga marginata, Schizolobium parahyba and Handroantus. serratifolius had higher tolerance to the herbicide, demonstrating potential for studies on the mechanism by which these plants exert such tolerance. Overall, the results revealed that the forest species studied demonstrate significant alterations in leaf anatomy in response to the presence of residues of herbicide clomazone in the soil, even in leaves with no visible lesions.

STRUCTURAL EVALUATION OF DAMAGE CAUSED BY HERBICIDE CLOMAZONE IN LEAVES OF ARBORESCENT SPECIES NATIVE TO BRAZIL