Bacterial community and phosphorus species changes in pepper rhizosphere soils after Pseudomonas putida Rs-198 inoculation

Add time:09/07/2019    Source:sciencedirect.com

The present study was designed to analyze the effect of Pseudomonas putida Rs-198 (Rs-198) on pepper plant nutrient accumulation and its root environment changes in slightly saline soil field condition at Xinjiang, China. Results showed that the application of Rs-198 increased the pepper biomass in shoot and root dry weight by 97% and 131%, respectively, and increased N, P and K uptake in pepper stem by 18.40%, 25.00% and 25.07%, respectively. Additionally, Rs-198 inoculated treatment significantly decreased Na content in pepper root by 59.71% likely for its salt stress alleviating ability. Differences in bacterial composition and predicted metagenome were observed between the Rs-198 inoculated treatment and the control in both bulk and rhizosphere soils. The gene abundance of Blastococcus, AKYG587, and Pseudomonas were significantly increased in bulk soil after Rs-198 inoculation, where as the abundance of Chloroflexi decreased at phyla level. Further analysis showed that Rs-198 inoculation increased the contents of available P, Ca2-P, Ca8-P, iron-P, aluminum-P and total-P by 34.28%, 32.68%, 18.04%, 9.90%, 14.51% and 9.01%. The bacterial community was changed with the variation of soil P form relative abundances and soil pH that associated with Rs-198 application. Overall, these findings indicate that the beneficial changes in soil environment condition, such as soil nutrition, bacterial community and functional bacterial diversity, could be attributed to rhizobacteria inoculation.

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