National Key Laboratory of Green Pesticide, South China Agricultural University, Guangzhou 510642, China; Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
Sci Total Environ. 2024 Dec 1;954:176327. doi: 10.1016/j.scitotenv.2024.176327. Epub 2024 Sep 17.
Thrips [Megalurothrips usitatus (Bagnall)] (Thysanoptera: Thripidae) is a pest that poses a serious challenge to global crop production and food supply, especially to the cowpea industry. Nano-delivery systems have broad application prospects in the prevention and control of pests in agriculture. Herein, three types of amino acid (AA) modified polysuccinimide nano-delivery carriers (PSI-GABA, PSI-ASP and PSI-GLU) were constructed with a diameter of approximately 150 nm to load thiamethoxam (THX), which enhanced THX effective distribution and use with cowpea plants. Significantly, the PSI-GLU nanocarrier effectively delivered THX to cowpea plant tissues following 6 h of soil application. Compared with commercial THX suspension (SC), the THX content in the leaves of cowpea plants was increased by 2.3 times. Confocal laser scanning microscopy revealed that the FITC-labeled PSI-GLU nanocarrier reached the leaves through the vascular system after being absorbed by the roots of cowpea plants. The PSI-GLU nanocarrier decreased the LC of THX from 11.45 to 7.79 mg/L and significantly enhanced the insecticidal effect. The PSI-GLU nanocarrier also improved the safety of THX to worker bees at 48 h, and moreover showed a growth-promoting effect on cowpea seedlings. These results demonstrated that the PSI-GLU nano-delivery carrier has promising uses on improving the effective utilization of THX for the sustainable control of thrips and reducing the risk to non-target pollutions.
蓟马[缨翅目：蓟马科]（Thysanoptera：Thripidae）是一种对全球作物生产和粮食供应构成严重威胁的害虫，尤其对豇豆产业构成威胁。纳米递药系统在农业害虫防治方面具有广阔的应用前景。在此，构建了三种类型的氨基酸（AA）修饰的聚琥珀酰亚胺纳米递药载体（PSI-GABA、PSI-ASP 和 PSI-GLU），其直径约为 150nm，用于负载噻虫嗪（THX），从而增强 THX 在豇豆植株上的有效分布和利用。显著的是，PSI-GLU 纳米载体在土壤施药 6 小时后能有效地将 THX 递送至豇豆植物组织。与市售噻虫嗪悬浮剂（SC）相比，豇豆叶片中 THX 的含量增加了 2.3 倍。共焦激光扫描显微镜显示，FITC 标记的 PSI-GLU 纳米载体被豇豆植物根部吸收后，通过维管束系统到达叶片。PSI-GLU 纳米载体将 THX 的 LC 从 11.45 降低至 7.79mg/L，显著增强了杀虫效果。PSI-GLU 纳米载体还提高了 THX 对工蜂的安全性，48 小时后，且对豇豆幼苗表现出促生长作用。这些结果表明，PSI-GLU 纳米递药载体有望提高 THX 的有效利用率，以可持续控制蓟马，降低对非靶标污染的风险。
