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Effect of glyphosate on the germination of Zygia longofolia seeds in the colombian amazon
Zygia longifolia contributes to the stabilization of riparian ecosystems and helps mitigate soil erosion in the Colombian Amazon, in addition to improving soil fertility through nitrogen fixation. However, it is necessary to study the effects of the herbicide glyphosate on non-target forest species, especially in regions where aerial spraying is used to eradicate illicit crops. This study aimed to evaluate the effect of different doses of glyphosate on the germination of Z. longifolia seeds using the paper roll technique. Seeds were soaked for 30 minutes in solutions with concentrations of 0.0; 1.8; 3.6; 5.4 and 7.2 g L⁻¹ of glyphosate acid equivalent. A quadratic reduction of 72.4% in seed vigor was observed as glyphosate doses increased from 0.0 to 7.2 g L⁻¹. No significant differences were found in the electrical conductivity test of the solution with seeds exposed to the herbicide. It was concluded that glyphosate negatively affects the germination of Z. longifolia, which has implications for its conservation and for the responsible use of herbicides in forested areas. The results highlight the importance of bioassays to understand the impact of glyphosate on forest species in the Colombian Amazon region.
