de Faria Giselle Santos, Carlos Leandro, Jakelaitis Adriano, de Freitas Samylla Tassia Ferreira, Vicentini Taíza Andressa, Silva Igor Olacir Fernandes, Vasconcelos Filho Sebastião Carvalho, Lourenço Lucas Loram, Farnese Fernanda Santos, Batista Marco Aurélio, Vitorino Luciana Cristina
Programa de Pós-Graduação em Ciências Agrárias, Instituto Federal de Educação, Ciência e Tecnologia Goiano (IF Goiano, Campus Rio Verde), Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde 75901-970, GO, Brazil.
Programa de Pós-Graduação em Biodiversidade e Conservação, Instituto Federal de Educação, Ciência e Tecnologia Goiano (IF Goiano, Campus Rio Verde), Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde 75901-970, GO, Brazil.
Plants (Basel). 2023 Dec 15;12(24):4163. doi: 10.3390/plants12244163.
This study aimed to evaluate the response of seedlings to sublethal doses of glyphosate. The increasing use of glyphosate in agriculture concerns the scientific community, as the drift of this pollutant into aquatic systems or atmospheric currents can affect non-target species. Therefore, we need to understand how non-target species respond to small doses of this herbicide. seedlings (clone BV-1110) were exposed to sublethal doses of glyphosate (0, 9.6, 19.2, 38.4, 76.8 g ae ha). Anatomical, physiological, and photochemical analyses were performed 60 days after herbicide application, and growth assessments were carried out after 160 days of cultivation. We found that sublethal doses of glyphosate above 19.2 g ae ha induced toxicity symptoms in leaves. These symptoms were mild in some cases, such as chlorosis, but severe in other cases, such as tissue necrosis. We observed a positive relationship between increased plant height and photochemical yield with plant exposure to sub-doses 9.6 and 19.2 g ae ha. A sublethal dose of 38.4 g ae ha improved the photosynthetic rate and carboxylation efficiency. Thus, we confirmed the hypothesis of a hormetic effect when was exposed to sub-doses of glyphosate equal to or lower than 38.4 g ae ha. However, the sublethal dose of 76.8 g ae ha must be considered toxic, impacting photosynthetic activity and, consequently, the height of . The stem diameter of responded positively to increasing glyphosate doses. This occurs to compensate for the negative effect of glyphosate on water absorption. Further research will provide valuable information for harnessing the potential benefits of hormesis to improve the productivity of .
本研究旨在评估幼苗对亚致死剂量草甘膦的反应。草甘膦在农业中的使用日益增加，这引起了科学界的关注，因为这种污染物漂移到水生系统或大气环流中会影响非目标物种。因此，我们需要了解非目标物种对这种除草剂小剂量的反应。将幼苗（克隆BV - 1110）暴露于亚致死剂量的草甘膦（0、9.6、19.2、38.4、76.8克酸当量/公顷）。在施用除草剂60天后进行解剖学、生理学和光化学分析，并在培养160天后进行生长评估。我们发现，亚致死剂量高于19.2克酸当量/公顷的草甘膦会在叶片中诱导毒性症状。这些症状在某些情况下较轻，如黄化，但在其他情况下较严重，如组织坏死。我们观察到，当植株暴露于9.6和19.2克酸当量/公顷的亚剂量时，株高增加与光化学产量之间存在正相关关系。38.4克酸当量/公顷的亚致死剂量提高了光合速率和羧化效率。因此，我们证实了植株暴露于等于或低于38.4克酸当量/公顷的草甘膦亚剂量时存在 hormetic 效应的假设。然而，76.8克酸当量/公顷的亚致死剂量必须被视为有毒，会影响光合活性，进而影响植株高度。植株的茎直径对草甘膦剂量增加呈积极反应。这是为了补偿草甘膦对水分吸收的负面影响。进一步的研究将为利用 hormesis 的潜在益处提高植株生产力提供有价值的信息。
