Plant Soil Environ., 2012, 58(2):55-61 | DOI: 10.17221/390/2010-PSE

Microbial community dynamics and function associated with rhizosphere over periods of rice growth

Q. Hussain1,2, G.X. Pan1, Y.Z. Liu1, A. Zhang1, L.Q. Li1, X.H. Zhang1, Z.J. Jin1
1 Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing, P.R. China
2 Department of Soil Science and Soil Water Conservation, Pir Mehr Ali shah, Arid Agriculture University, Rawalpindi, Pakistan

A field experiment was conducted to illustrate the different degree and dynamics of microbial community structure and function in the rhizosphere across four growing stages (before plantation and three growth stages) using a combination of biochemical (enzyme assay and microbial biomass carbon) and molecular approaches of qPCR and PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis). Rice plant cultivation promoted higher enzyme activities (invertase and urease), microbial biomass carbon (Cmic), bacterial (16S rRNA) and fungal (ITS rRNA) genes abundances in the rhizosphere compared to unplanted soil. Principal component analyses of PCR-DGGE profile also revealed that structures of bacterial and fungal communities of rice planted soil were well distinct from unplanted soil. Moreover, enzyme activities showed a significant positive correlation with the total microbial biomass in the rhizosphere throughout growth stages of rice plant. Relative fungal: bacterial ratios were significantly higher in rice planted soil compared to unplanted soil, suggesting rice plantation enhanced the fungal community in the rice rhizosphere environment. These results further suggest a significant linkage between the microbial community dynamics and function in the rhizosphere associated with rice plant over time.

Keywords: Oryza sativa; temporal effect; spatial effect; symbiosis of plants and soil microflora; enzyme activities; field ecosystems

Published: February 29, 2012  Show citation

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Hussain Q, Pan GX, Liu YZ, Zhang A, Li LQ, Zhang XH, Jin ZJ. Microbial community dynamics and function associated with rhizosphere over periods of rice growth. Plant Soil Environ. 2012;58(2):55-61. doi: 10.17221/390/2010-PSE.
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