Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 50, Pages 15097-15107Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c05070
Keywords
deltamethrin; sublethal effects; transgenerational-stimulating fecundity; hormesis; symbiotic bacteria
Funding
- Tarim University of National Key RAMP
- D Program of China [2017YFD0201900]
- Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences
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This study demonstrates that sublethal deltamethrin pesticide has a significant impact on the population dynamics and symbiotic bacterial community of cotton aphids, exhibiting intergenerational hormesis effects.
In aphids, hormesis and symbiotic bacteria are the drivers for the development of pesticide resistance. However, the related mechanism remains unclear. Here, we evaluated the sublethal and transgenerational effects of the extensively used pyrethroid pesticide deltamethrin (DMT) on the population dynamics in Aphis gossypii and tested its influence on symbiotic bacterial communities. The leaf-dip bioassay revealed that DMT was highly toxic to A. gossypii, and at a low lethal concentration of DMT, the intrinsic (r) and finite rates of increase (lambda) of the initially exposed aphids (G0) significantly decreased. Intriguingly, the r, lambda, and net reproductive rate (R-0) of G1 and G2 significantly increased, but the r and lambda decreased in G3. The adult and total preoviposition period increased in G3 but decreased in G4. Additionally, the diversity of the bacterial community decreased, while the abundance values of Buchnera, Pseudomonadaceae, and Burkholderiaceae increased after 24 h of exposure to LC30 DMT in G0 aphids, and the latter two decreased in G1 but increased in G2. In summary, sublethal DMT has intergenerational hormesis effect on cotton aphids in G1-G2 and remarkably altered their symbiotic bacterial community and abundance. These results broaden our understanding of the relationship of hormesis and symbiotic bacteria in aphids under insecticide exposure.
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