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Soil and rhizosphere as habitats for Pseudomonas inoculants: new knowledge on distribution, activity and physiological state derived from micro-scale and single-cell studies

  • Chapter
Interactions in the Root Environment: An Integrated Approach

Part of the book series: Developments in Plant and Soil Sciences ((DPSS,volume 96))

Abstract

Pseudomonas spp. comprise an important group of bacteria used for biological control of microfungi in the plant rhizosphere. Successful performance of microbial inoculants requires both establishment, proliferation and activity under in situ conditions. To identify the factors controlling fate and performance of the inoculants, small-scale analyses are needed due to the heterogeneity characterizing the complex soil and rhizosphere environments. Direct staining techniques and advanced microscopy have provided the first detailed single-cell images of root colonization by these bacteria using fluorescent antibodies, fluorescent in situ hybridization and marker gene technology. These tracking methods have, in conjunction with activity assays, provided high-resolution data on the metabolic activity and growth of the inoculants. Finally, Pseudomonas reporter bacteria constructed to sense phosphorus, nitrogen, iron, and oxygen limitations have provided new insight into the significance of growth-limiting factors in the soil and along the root. The present work reviews the current knowledge on Pseudomonas inoculants in soil and rhizosphere based on these modern techniques. Finally, some perspectives for future studies are discussed.

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Authors and Affiliations

  1. Section of Genetics and Microbiology, Department of Ecology, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark

    Jan Sørensen, Linda Elise Jensen & Ole Nybroe

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  1. Jan Sørensen
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  2. Linda Elise Jensen
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  3. Ole Nybroe
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David S. Powlson Geoff L. Bateman Keith G. Davies John L. Gaunt Penny R. Hirsch

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Sørensen, J., Jensen, L.E., Nybroe, O. (2002). Soil and rhizosphere as habitats for Pseudomonas inoculants: new knowledge on distribution, activity and physiological state derived from micro-scale and single-cell studies. In: Powlson, D.S., Bateman, G.L., Davies, K.G., Gaunt, J.L., Hirsch, P.R. (eds) Interactions in the Root Environment: An Integrated Approach. Developments in Plant and Soil Sciences, vol 96. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0566-1_10

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  • DOI: https://doi.org/10.1007/978-94-010-0566-1_10

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  • Print ISBN: 978-94-010-3925-3

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