Sorghum rhizosphere effects reduced soil bacterial diversity by recruiting specific bacterial species under low nitrogen stress
| Autor: | Jun Guo, Li-Ge Wang, Anqi Sun, Hang-Wei Hu, Ai-Lian Wu, Jin-Song Wang, Xiao-Yan Jiao, Dong Erwei |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Rhizobiaceae 010504 meteorology & atmospheric sciences Nitrogen 010501 environmental sciences 01 natural sciences Soil Environmental Chemistry Waste Management and Disposal Relative species abundance Soil Microbiology Sorghum 0105 earth and related environmental sciences Abiotic component Rhizosphere biology Bacteria food and beverages biology.organism_classification Pollution Agronomy Alpha diversity Species richness Soil microbiology |
| Zdroj: | The Science of the total environment. 770 |
| ISSN: | 1879-1026 |
| Popis: | Rhizosphere microbiota play a pivotal role in promoting plant growth and defending against pathogens, but their responses to abiotic environmental stress remain largely elusive. Here, we investigated the influences of low-N stress on rhizosphere bacteria of six sorghum cultivars in a glasshouse experiment. The alpha diversity of bacteria (as revealed by Shannon diversity and Chao1 richness indices) was remarkably lower in rhizosphere soils than in bulk soils, and was significantly higher under low-N stress than under N addition. Principal coordinates analysis revealed that the bacterial community compositions in rhizosphere soils were clearly separated from bulk soils, and the rhizosphere soils under low-N stress or with N fertilization were clearly separated, indicating that both rhizosphere effects and N fertilization impacted the rhizosphere bacterial community. Notably, the relative abundances of beneficial bacteria such as Bacillaceae and Streptomycetaceae significantly increased in rhizosphere soils under low-N stress, which had significantly positive correlations with the sorghum N uptake. The relative abundance of Nitrosomonadaceae in rhizosphere soils was significantly lower than that in bulk soils, while the relative abundance of Rhizobiaceae showed an opposite pattern. Taken together, our results suggested that sorghum rhizosphere effects can reduce soil bacterial diversity possibly through recruiting specific bacterial species under low N stress. |
| Databáze: | OpenAIRE |
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