Sousa Bruno Teixeira de, Pereira Anderson do Espirito Santo, Fraceto Leonardo Fernandes, Oliveira Halley Caixeta, Dalazen Giliardi
Department of Agronomy, Londrina State University (UEL), PR 445, km 380, 86057-970 Londrina, PR, Brazil.
Department of Animal and Plant Biology, Londrina State University (UEL), PR 445, km 380, 86057-970 Londrina, PR, Brazil.
Heliyon. 2022 Jul 8;8(7):e09902. doi: 10.1016/j.heliyon.2022.e09902. eCollection 2022 Jul.
The encapsulation of atrazine into poly(epsilon-caprolactone) nanocapsules has been shown to improve the efficiency of the herbicide and decrease its environmental impacts. In the current work, we evaluated the efficiency of nanoatrazine in the post-emergence control of Colla plants and performed a meta-analysis to compare the results with studies already published with other weeds. The first experiment was carried out in the field, where we observed that nanoatrazine (at 200 g a. i. ha) induced higher inhibition of the maximum quantum efficiency of photosystem II (up to 39%) than conventional atrazine at the same concentration. However, nanoencapsulation did not improve the visually-determined weed control by atrazine. To better understand the response of plants to nanoatrazine, a second experiment was carried out in a greenhouse with four-leaf stage plants treated with nano and conventional atrazine at 200, 500, 1000, and 2000 g a. i. ha. Nanoatrazine showed higher efficiency (up to 33%) than commercial atrazine in inhibiting photosystem II activity at all doses until 48 h after application. Again, weed control and plant dry mass did not differ between formulations. From the meta-analysis, it was observed that plants showed a response to nanoatrazine that differs from other target species, as the gain in efficiency resulting from the nanoencapsulation was restricted to the short-term analysis, and did not result in better weed control. These results reinforce that the efficiency of nanoatrazine is dependent on the studied species.
已证明将莠去津包封到聚（ε-己内酯）纳米胶囊中可提高除草剂的效率并降低其对环境的影响。在当前工作中，我们评估了纳米莠去津在出苗后防治科拉植物方面的效率，并进行了荟萃分析，以将结果与已发表的关于其他杂草的研究进行比较。第一个实验在田间进行，我们观察到纳米莠去津（200克有效成分/公顷）在相同浓度下比传统莠去津对光系统II的最大量子效率的抑制作用更高（高达39%）。然而，纳米包封并未改善莠去津在视觉上确定的杂草防治效果。为了更好地了解植物对纳米莠去津的反应，在温室中对处于四叶期的植物进行了第二个实验，用纳米和传统莠去津分别以200、500、1000和2000克有效成分/公顷的剂量处理。在施用后48小时内，纳米莠去津在所有剂量下对光系统II活性的抑制效率均高于商业莠去津（高达33%）。同样，两种制剂在杂草防治和植物干重方面没有差异。从荟萃分析中观察到，植物对纳米莠去津的反应与其他目标物种不同，因为纳米包封带来的效率提升仅限于短期分析，并未导致更好的杂草防治效果。这些结果强化了纳米莠去津的效率取决于所研究物种的观点。
