Fabricating supramolecular pre-emergence herbicide CPAM-BPyHs for farming herbicide-resistant rice

Ronghua Chen, Chaozheng Li, Di Zhao, Guili Yang, Lingda Zeng (), Fei Lin () and Hanhong Xu ()
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Ronghua Chen: South China Agricultural University
Chaozheng Li: South China Agricultural University
Di Zhao: South China Agricultural University
Guili Yang: South China Agricultural University
Lingda Zeng: South China Agricultural University
Fei Lin: South China Agricultural University
Hanhong Xu: South China Agricultural University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract Controlling weeds before their emergence is crucial for minimizing their impacts on crop yield and quality. Bipyridyl herbicides (BPyHs), a class of highly effective and broad-spectrum herbicides, cannot be used as pre-emergence herbicides because they can be absorbed and inactivated by negatively charged soil after application. Here, we design and fabricate an adsorbed-but-active supramolecular pre-emergence herbicide consisting of cationic polyacrylamide and bipyridyl herbicides (CPAM-BPyHs). CPAM is a positively charged polymer. It can preferentially bind to soil particles and shift their electric potential to a more positive value. Thus, it prevents not only runoff but also inactivation of BPyHs. We also develop a BPyHs-resistant rice line by mutation of the gene encoding L-type amino acid transporter 5 (OsLAT5). Field trial results show that the weed control efficiency of CPAM-diquat for direct-seeded herbicide-resistant rice line exceeds 90%. The herbicidal activity can maintain up to one month with only one application. This work offers a method for rice weed control and provides insights into the design of pesticides to prevent soil inactivation and runoff.

Date: 2025
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DOI: 10.1038/s41467-025-59582-9

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