Abstract
Applying chemical elicitors is considered a promising approach for controlling pests in the field. Our previous studies have shown that gibberellin (GA) signaling positively regulates the resistance of rice (Oryza sativa) to the brown planthopper (BPH) Nilaparvata lugens (Stål). Yet, whether the exogenous application of GAs can enhance the resistance of rice to BPH remains unknown. Here, we investigated the influence of exogenous GA3 on both defense responses in rice and BPH performance. We found that pretreating rice with GA3 decreased transcript levels of a mitogen-activated protein kinase (MAPK) and three WRKY transcription factors, as well as levels of BPH-elicited jasmonic acid (JA) and three phenolic acids but increased the release of ethylene. Moreover, GA3 treatment negatively affected the survival and development of BPH nymphs as well as the fecundity of BPH female adults. These findings suggest that GA3 promotes the resistance of rice to BPH and may, thus, be used to improve pest management in rice.
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Abbreviations
- BPH:
-
Brown planthopper
- ET:
-
Ethylene
- GA:
-
Gibberellin
- GAI:
-
Gibberellin insensitive
- HAMPs:
-
Herbivore-associated molecular patterns
- HPLC–MS/MS:
-
High-performance liquid chromatography/mass spectrometry/mass spectrometry
- JA:
-
Jasmonic acid
- MAPK:
-
Mitogen-activated protein kinase
- QRT-PCR:
-
Quantitative real-time PCR
- RGL1:
-
RGA-LIKE1
- SA:
-
Salicylic acid
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The study was jointly sponsored by the earmarked fund for China Agriculture Research System (CARS-01-40) and the National Program of Ministry of Agriculture of China (2016ZX08009003-001).
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Wang, W., Jin, N., Mo, X. et al. Exogenous Gibberellin GA3 Enhances Defense Responses in Rice to the Brown Planthopper Nilaparvata lugens (Stål). J. Plant Biol. 64, 379–387 (2021). https://doi.org/10.1007/s12374-020-09271-5
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DOI: https://doi.org/10.1007/s12374-020-09271-5