Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 177, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2021.104897
Keywords
PPO; Coumarins; Herbicidal activity; Molecular docking; Accumulated concentration
Categories
Funding
- National Natural Science Foundation of China [31572042]
- Postdoctoral Research Startup Fund of Heilongjiang Province [LBH-Q19083]
- Research Science Foundation in Technology Innovation of Harbin [2017RAQXJ017]
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By synthesizing a series of novel phenoxypyridine derivatives, compounds W3.1 and W3.4 were found to exhibit excellent herbicidal activity, similar to the commercial herbicide oxyfluorfen. Among these compounds, W3.4 showed the best herbicidal activity and deserves further research for new herbicide development.
To seek novel and safe protoporphyrinogen oxidase (PPO, EC 1.3.3.4) inhibitors with excellent herbicidal activity. A series of novel phenoxypyridine derivatives containing natural product coumarins with allelopathy were designed and synthesized based on bioisosterism and active subunit combination in this research. Compounds W3.1 and W3.4, with the half-maximal inhibitory concentration (IC50) value of 0.02653 mg/L and 0.01937 mg/ L, respectively, displayed excellent herbicidal activity in greenhouse. Their herbicidal activity was similar to commercial herbicide oxyfluorfen (IC50 = 0.04943 mg/L). The best field inhibitory effect of compounds W3.1 and W3.4 recorded was at doses of 450 g ai/ha and 300 g ai/ha, respectively. Compound W3.4 had the best herbicidal activity among all the target compounds in this paper. Molecular docking analysis revealed that compounds W3.1 and W3.4 could form a hydrogen bonds with the amino acid AGR-98 and a 7C-7C superposition with the amino acid PHE-398, respectively, which was similar to the oxyfluorfen. The crop selectivity tests results indicated that maize, cotton and soybean showed high tolerance to compound W3.4. Compound W3.4 reduced the Ca and Cb contents of wheat and rice, but had less effect on maize, cotton and soybean. Selectivity of compound W3.4 in maize, cotton and soybean were appeared to be due to reduced absorption of the herbicide compared to wheat and rice. Compound W3.4 deserves further attention as a candidate structure for new herbicides.
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