Study on the efficacy of different fungicides against rice new pathogen <i>Pantoea ananatis</i>

CHEN Liangye; XU Ruitao; CAI Yunchen; SHI Yu; CUI Zining

doi:10.7671/j.issn.1001-411X.202504008

Journal of South China Agricultural University > 2025 > 46(4): 480-487. > DOI: 10.7671/j.issn.1001-411X.202504008

CHEN Liangye, XU Ruitao, CAI Yunchen, et al. Study on the efficacy of different fungicides against rice new pathogen Pantoea ananatis[J]. Journal of South China Agricultural University, 2025, 46(4): 480-487. DOI: 10.7671/j.issn.1001-411X.202504008

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Study on the efficacy of different fungicides against rice new pathogen Pantoea ananatis

1.
Integrative Microbiology Research Center/College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
2.
Guangzhou Dublin International College of Life Sciences and Technology, South China Agricultural University, Guangzhou 510642, China
3.
College of Life Sciences, Henan Normal University, Xinxiang 453007, China

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Received Date: April 09, 2025
Available Online: June 10, 2025
Published Date: June 15, 2025

Graphical Abstract

Abstract

Abstract

Objective
To screen highly effective fungicides against rice leaf blight caused by the new pathogen Pantoea ananatis.
Method
Total 16 fungicides were screened via in vitro antibacterial experiments. The effects of three commercial agents on P. ananatis were systematically evaluated by apoptosis, reactive oxygen species (ROS) accumulation and in vivo efficacy.
Result
Both 3 g/L tetramycin AS and 80% ( $\omega$ ) ethylicin EC had good antibacterial effects against P. ananatis, with EC₅₀ of 0.76 and 3.70 μg/mL, respectively. Further mechanism research found that 3 g/L tetramycin AS obviousily induced apoptosis of P. ananatis, increasing the early apoptosis rate to 55.89%, and markedly boosted the level of ROS, causing a marked rise in fluorescence intensity. In the efficacy test of rice bacterial leaf blight caused by P. ananatis, the protective activity of 80% ethylicin EC reached 73.18%, significantly outperforming 3 g/L tetramycin AS (60.71%). Conversely, 3 g/L tetramycin AS showed remarkable therapeutic activity at 69.32%.
Conclusion
Tetracymycin can be used to treat the disease effectively by inducing apoptosis and ROS accumulation after the occurrence of the disease, while the outstanding protective activity of ethylicin is more suitable for early prevention.
- Rice leaf blight,
- Pantoea ananatis,
- Fungicide,
- Therapeutic activity,
- Protective activity

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References (34)

References

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