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Int. J. Mol. Sci. 2016, 17(5), 784; doi:10.3390/ijms17050784

Impact of Faba Bean-Seed Rhizobial Inoculation on Microbial Activity in the Rhizosphere Soil during Growing Season

Institute of Agrophysics, Polish Academy of Sciences, Department of Soil and Plant System, P.O. Box 201, 20-290 Lublin, Poland
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Author to whom correspondence should be addressed.
Academic Editors: Peter M. Gresshoff and Brett Ferguson
Received: 22 March 2016 / Revised: 5 May 2016 / Accepted: 12 May 2016 / Published: 20 May 2016
(This article belongs to the Special Issue Molecular Signals in Nodulation Control)
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Abstract

Inoculation of legume seeds with Rhizobium affects soil microbial community and processes, especially in the rhizosphere. This study aimed at assessing the effect of Rhizobium inoculation on microbial activity in the faba bean rhizosphere during the growing season in a field experiment on a Haplic Luvisol derived from loess. Faba bean (Vicia faba L.) seeds were non-inoculated (NI) or inoculated (I) with Rhizobium leguminosarum bv. viciae and sown. The rhizosphere soil was analyzed for the enzymatic activities of dehydrogenases, urease, protease and acid phosphomonoesterase, and functional diversity (catabolic potential) using the Average Well Color Development, Shannon-Weaver, and Richness indices following the community level physiological profiling from Biolog EcoPlate™. The analyses were done on three occasions corresponding to the growth stages of: 5–6 leaf, flowering, and pod formation. The enzymatic activities were higher in I than NI (p < 0.05) throughout the growing season. However, none of the functional diversity indices differed significantly under both treatments, regardless of the growth stage. This work showed that the functional diversity of the microbial communities was a less sensitive tool than enzyme activities in assessment of rhizobial inoculation effects on rhizosphere microbial activity. View Full-Text
Keywords: soil enzymes; rhizosphere; Vicia faba; functional diversity of soil; Rhizobium leguminosarum; biofertilizers soil enzymes; rhizosphere; Vicia faba; functional diversity of soil; Rhizobium leguminosarum; biofertilizers
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MDPI and ACS Style

Siczek, A.; Lipiec, J. Impact of Faba Bean-Seed Rhizobial Inoculation on Microbial Activity in the Rhizosphere Soil during Growing Season. Int. J. Mol. Sci. 2016, 17, 784.

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