Rodrigo Eduardo Barros, Matheus Mendes Reis, Leonardo David Tuffi Santos, João Paulo Fernandes Tiago, Érika Manuela Gonçalves Lopes, Luan Mateus Silva Donato
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Water samples remaining from the pots were used for chemical quantification of root exudation of glyphosate and AMPA in high-performance liquid chromatography. <i>Cucurbita pepo</i> plants were used as bioindicators of glyphosate in the water remaining in the pots after applying herbicide. The increase in glyphosate doses promoted linear growth in <i>E. urophylla</i> intoxication and significantly reduced total dry mass and root production. <i>E. urophylla</i> plants had their photosynthetic, transpiratory, and stomatal conductance rates reduced as the herbicide doses increased. The AMPA root exudation was not detected, but it was possible to identify the presence of glyphosate by bioassay and chemical methods. Root exudation of glyphosate by eucalyptus can result in lesser herbicide action in plant control and cause contamination of deeper soil layers.</p>","PeriodicalId":15720,"journal":{"name":"Journal of Environmental Science and Health Part B-pesticides Food Contaminants and Agricultural Wastes","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Root exudation of glyphosate in <i>Eucalyptus urophylla</i> S.T. 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引用次数: 0
摘要
草甘膦在桉树管理中非常突出,因此了解其行为、对植物的影响以及可能对环境造成的影响至关重要。本研究旨在利用色谱法和生物法确定和量化草甘膦和氨甲基膦酸(AMPA)在桉树根部的渗出量。对草甘膦的五种剂量(0、360、720、1080 和 1440 g a.e ha-1)进行了测试。生理和中毒评估在施用除草剂后进行。盆中残留的水样通过高效液相色谱法对草甘膦和 AMPA 的根渗出量进行化学定量。葫芦科植物被用作施用除草剂后花盆剩余水中草甘膦的生物指示剂。草甘膦剂量的增加促进了 E. urophylla 的线性生长,并显著降低了总干质量和根的产量。随着除草剂剂量的增加,E. urophylla 植物的光合作用、蒸腾作用和气孔导率都有所降低。虽然没有检测到 AMPA 根渗出,但可以通过生物测定和化学方法确定草甘膦的存在。桉树根部渗出草甘膦会降低除草剂对植物的控制作用,并造成更深层土壤的污染。
Root exudation of glyphosate in Eucalyptus urophylla S.T. Blake.
Glyphosate stands out in the eucalyptus management, which makes it essential to know its behavior, its effects on the plant, and possible environmental impacts. This study aimed to identify and quantify the root exudation of glyphosate and aminomethylphosphonic acid (AMPA) by Eucalyptus urophylla with chromatographic and biological methods. The five glyphosate doses were tested (0, 360, 720, 1080 and 1440 g a.e ha-1) on E. urophylla plants. The physiological and intoxication evaluations were performed after herbicide application. Water samples remaining from the pots were used for chemical quantification of root exudation of glyphosate and AMPA in high-performance liquid chromatography. Cucurbita pepo plants were used as bioindicators of glyphosate in the water remaining in the pots after applying herbicide. The increase in glyphosate doses promoted linear growth in E. urophylla intoxication and significantly reduced total dry mass and root production. E. urophylla plants had their photosynthetic, transpiratory, and stomatal conductance rates reduced as the herbicide doses increased. The AMPA root exudation was not detected, but it was possible to identify the presence of glyphosate by bioassay and chemical methods. Root exudation of glyphosate by eucalyptus can result in lesser herbicide action in plant control and cause contamination of deeper soil layers.