Welcome to Chinese Journal of Biological Control,Today is

Chinese Journal of Biological Control ›› 2026, Vol. 42 ›› Issue (3): 569-581.DOI: 10.16409/j.cnki.2095-039x.2025.09.019

• RESEARCH REPORTS • Previous Articles    

Resistance to the Brown Planthopper Afforded by the Secondary Metabolite Coumarin in Rice

YAO Xinxuan, ZHOU Wenrun, CHEN Tongtong, YU Xiaoping, HAO Peiying   

  1. Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine/College of Life Sciences, China Jiliang University, Hangzhou 310018, China
  • Received:2025-06-04 Published:2026-06-25

Abstract: Secondary metabolites play a crucial role in plant defense against pests and diseases. Based on previous metabolomic analyses of rice, this study employed HPLC to determine the content of the target compound coumarin. The results revealed that, when the rice plants were infested by the brown planthopper(BPH), the coumarin content in the leaf sheaths of the resistant rice line R1 was increased by 2.88 folds compared to the susceptible line S9. When coumarin was added to an artificial diet at 0.1 mg/mL and 0.5 mg/mL and fed to BPH, the survival rates of nymphs decreased by 38.89% and 80% at 7 days after treatment, respectively, compared to the control. Coumarin stress also led to a reduction in adult female body weight, an average decrease of 89 eggs in oviposition, and a 16.29% reduction in egg hatchability. The abundance of endosymbiotic fungi was decreased by 49.73% at 5 days after treatment, with significant reductions observed in fungi such as Ascomycetes and Arsenophonus in various BPH tissues. Molecular docking analysis revealed the interaction characteristics between coumarin and the candidate target protein carbonic anhydrase in BPH, providing preliminary insights into the mechanism of coumarin's effects on BPH. This study elucidates the resistance role of rice-derived coumarin against BPH and its endosymbiotic fungi, offering new clues for understanding rice insect resistance mechanisms and for the development of environmentally friendly pest management strategies.

Key words: rice, coumarin, brown planthopper, symbiotic bacteria

CLC Number: