Root cap influences root colonisation by Pseudomonas fluorescens SBW25 on maize

Sonia N. Humphris, A. Glyn Bengough, Bryan S. Griffiths, Ken Kilham, Sheena Rodger, Vicky Stubbs, Tracy A. Valentine, Iain M. Young

    Research output: Contribution to journalArticlepeer-review

    46 Citations (Scopus)


    We investigated the influence of root border cells on the colonisation of seedling Zea mays roots by Pseudomonas fluorescens SBW25 in sandy loam soil packed at two dry bulk densities. Numbers of colony forming units (CFU) were counted on sequential sections of root for intact and decapped inoculated roots grown in loose (1.0 mg m-3) and compacted (1.3 mg m-3) soil. After two days of root growth, the numbers of P. fluorescens (CFU cm-1) were highest on the section of root just below the seed with progressively fewer bacteria near the tip, irrespective of density. The decapped roots had significantly more colonies of P. fluorescens at the tip compared with the intact roots: approximately 100-fold more in the loose and 30-fold more in the compact soil. In addition, confocal images of the foot tips grown in agar showed that P. fluorescens could only be detected on the tips of the decapped roots. These results indicated that border cells, and their associated mucilage, prevented complete colonization of the root tip by the biocontrol agent P. fluorescens, possibly by acting as a disposable surface or sheath around the cap. (c) 2005 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)123-130
    Number of pages8
    JournalFEMS Microbiology Ecology
    Issue number1
    Publication statusPublished - Sept 2005


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