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Effects of Water Stress, Organic Amendment and Mycorrhizal Inoculation on Soil Microbial Community Structure and Activity During the Establishment of Two Heavy Metal-Tolerant Native Plant Species

  • Environmental Microbiology
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Abstract

Our aim was to examine the effect of water stress on plant growth and development of two native plant species (Tetraclinis articulata and Crithmum maritimum) and on microbial community composition and activity in the rhizosphere soil, following the addition of an organic amendment, namely sugar beet residue (SBR), and/or the inoculation with an arbuscular mycorrhizal (AM) fungus, namely Glomus mosseae, in a non-sterile heavy metal-polluted soil. The AM inoculation did not have any significant effect on plant growth of both species. In T. articulata, SBR increased shoot growth, foliar P, total phospholipid fatty acids (PLFA), fungi-related PLFA, AM fungi-related neutral lipid fatty acid, bacterial gram-positive/gram-negative PLFA ratio and the β-glucosidase and dehydrogenase activities. SBR and AM inoculation increased phosphatase activity in T. articulata plants grown under drought conditions. In both plants, there was a synergistic effect between AM inoculation and SBR on mycorrhizal colonisation under drought conditions. In C. maritimum, the increase produced by the SBR on total amounts of PLFA, bacterial gram-positive-related PLFA and bacterial gram-negative-related PLFA was considerably higher under drought conditions. Our results suggest that the effectiveness of the amendment with regard to stimulating microbial communities and plant growth was largely limited by drought, particularly for plant species with a low degree of mycorrhizal colonisation.

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Acknowledgements

This research was supported by CICYT (project AGL2009-12530-CO2-01).

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Authors and Affiliations

  1. Department of Soil and Water Conservation, CSIC-Centro de Edafología y Biología Aplicada del Segura, P.O. Box 164, Campus de Espinardo, 30100, Murcia, Spain

    D. A. Fernández, A. Roldán & F. Caravaca

  2. Microbiology Department, CSIC-Estación Experimental del Zaidín, Profesor Albareda, 1, 18008, Granada, Spain

    R. Azcón

  3. Department of Microbial Ecology, Lund University, Ecology Building, 22362, Lund, Sweden

    E. Bååth

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  1. D. A. Fernández
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  2. A. Roldán
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  3. R. Azcón
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  4. F. Caravaca
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  5. E. Bååth
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Correspondence to F. Caravaca.

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Fernández, D.A., Roldán, A., Azcón, R. et al. Effects of Water Stress, Organic Amendment and Mycorrhizal Inoculation on Soil Microbial Community Structure and Activity During the Establishment of Two Heavy Metal-Tolerant Native Plant Species. Microb Ecol 63, 794–803 (2012). https://doi.org/10.1007/s00248-011-9972-y

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