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    Time-resolution of the shoot and root growth of the model cereal Brachypodium in response to inoculation with Azospirillum bacteria at low phosphorus and temperature

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    Author
    Schillaci, M; Arsova, B; Walker, R; Smith, PMC; Nagel, KA; Roessner, U; Watt, M
    Date
    2020-11-01
    Source Title
    Plant Growth Regulation: an international journal on plant growth and development
    Publisher
    SPRINGER
    University of Melbourne Author/s
    Schillaci, Martino; Roessner, Ute; Walker, Robert
    Affiliation
    School of BioSciences
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Schillaci, M., Arsova, B., Walker, R., Smith, P. M. C., Nagel, K. A., Roessner, U. & Watt, M. (2020). Time-resolution of the shoot and root growth of the model cereal Brachypodium in response to inoculation with Azospirillum bacteria at low phosphorus and temperature. PLANT GROWTH REGULATION, 93 (1), pp.149-162. https://doi.org/10.1007/s10725-020-00675-4.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252259
    DOI
    10.1007/s10725-020-00675-4
    Abstract
    <jats:title>Abstract</jats:title><jats:p>A non-invasive plant phenotyping platform, <jats:italic>GrowScreen-PaGe</jats:italic>, was used to resolve the dynamics of shoot and root growth of the model cereal Brachypodium (<jats:italic>Brachypodium distachyon</jats:italic> Bd21-3) in response to the plant growth promoting (PGP) bacteria Azospirillum (<jats:italic>Azospirillum brasilense</jats:italic> Sp245). Inoculated Brachypodium plants had greater early vigor and higher P use efficiency than non-inoculated Brachypodium at low P and low temperature conditions. Root systems were imaged non-invasively at eight time points and data combined with leaf area, shoot biomass and nutrient content from destructive subsamples at 7, 14 and 21 days after inoculation (DAI). Azospirillum colonisation of roots improved Brachypodium shoot and, to a greater degree, root growth in three independent experiments. Inoculation promoted P use efficiency in shoots but not P concentration or uptake, despite increased total root length. Longer roots in inoculated plants arose from twofold faster branch root growth but slower axile root growth, detected at 11 DAI. Analysis of the spatio-temporal phenotypes indicated that the effects of Azospirillum inoculation increased as shoot P concentration declined, but the magnitude depended on the time after inoculation and growth rate of branch roots compared to axile roots. High throughput plant phenotyping platforms allow the details of plant-microorganism symbioses to be resolved, offering insights into the timing of changes in different tissues to allow molecular mechanisms to be determined.</jats:p>

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