4.7 Article

Changes in the Endophytic Bacterial Community of Brassica rapa after Application of Systemic Insecticides

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MDPI
DOI: 10.3390/ijms242015306

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endophytic bacteria; insecticides; polymerase chain reaction; restriction fragment length polymorphism; bacterial diversity; principal component analysis

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This study found that the use of insecticides not only negatively affects endophytic bacterial communities, but also leads to a decrease in bacterial diversity and abundance. Additionally, it was observed that plants can regulate and moderate their microbiome during their lifecycle depending on surrounding environmental conditions.
Insecticides not only control target pests but also adversely affect non-target communities including humans, animals, and microbial communities in host plants and soils. The effect of insecticides on non-target communities, especially endophytic bacterial communities, remains poorly understood. Two phases of treatments were conducted to compare the trends in endophytic bacterial response after insecticide application. Endophytic bacteria were isolated at 2 and 4 weeks after germination. Most insecticide treatments showed a declining trend in bacterial diversity and abundance, whereas an increasing trend was observed in the control. Therefore, insecticide use negatively affected non-target endophytic bacterial communities. Bacillus spp. was mostly dominant in the early stage in both insecticide treatment and control groups. Nevertheless, in the matured stage, mostly bacteria including Pseudomonas spp., Priestia spp. were dominant in groups treated with high insecticide concentrations. Therefore, plants can regulate and moderate their microbiome during their lifecycle depending on surrounding environmental conditions.

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