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Physiological responses of Eucalyptus x urograndis to glyphosate are dependent on the genotype
- Leonardo Bianco De Carvalho, Stephen Duke, Pedro Luis Da Costa Aguiar Alves
- Scientia Forestalis 2018 v.46 no.118 pp. 177-187
- Eucalyptus, carbon dioxide, carbon dioxide fixation, gas exchange, genotype, glyphosate, growth chambers, leaf thickness, phosphonates, physiological response, shikimic acid, stomata, stomatal conductance
- Two experiments were conducted to evaluate the response of Eucalyptus urograndis genotypes (C219 and GG100) to glyphosate in growth chambers. As glyphosate dose increased (18 up to 720 g ae ha-1), CO2 assimilation rate, transpiration rate, and stomatal conductance decreased fastest and strongest in the GG100 compared to the C219 genotype. Shikimic acid accumulated at highest levels in the GG100 genotype, at 1 and 2 days after spraying glyphosate at a single dose of 180 g ae ha-1. No significant differences occurred between genotypes in glyphosate content, leaf thickness, and stomatal index. Aminomethylphosphonic acid was not detected in neither genotype. Gas exchange alteration due to glyphosate exposure is dependent on eucalyptus genotype.