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    A dual porosity model of nutrient uptake by root hairs

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    Type
    Article
    Authors
    Zygalakis, K. C.
    Kirk, G. J. D.
    Jones, D. L.
    Wissuwa, M.
    Roose, T.
    KAUST Grant Number
    KUK-C1-013-04
    Date
    2011-08-09
    Online Publication Date
    2011-08-09
    Print Publication Date
    2011-11
    Permanent link to this record
    http://hdl.handle.net/10754/597258
    
    Metadata
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    Abstract
    Summary: • The importance of root hairs in the uptake of sparingly soluble nutrients is understood qualitatively, but not quantitatively, and this limits efforts to breed plants tolerant of nutrient-deficient soils. • Here, we develop a mathematical model of nutrient uptake by root hairs allowing for hair geometry and the details of nutrient transport through soil, including diffusion within and between soil particles. We give illustrative results for phosphate uptake. • Compared with conventional 'single porosity' models, this 'dual porosity' model predicts greater root uptake because more nutrient is available by slow release from within soil particles. Also the effect of soil moisture is less important with the dual porosity model because the effective volume available for diffusion in the soil is larger, and the predicted effects of hair length and density are different. • Consistent with experimental observations, with the dual porosity model, increases in hair length give greater increases in uptake than increases in hair density per unit main root length. The effect of hair density is less in dry soil because the minimum concentration in solution for net influx is reached more rapidly. The effect of hair length is much less sensitive to soil moisture. © 2011 The Authors. New Phytologist © 2011 New Phytologist Trust.
    Citation
    Zygalakis KC, Kirk GJD, Jones DL, Wissuwa M, Roose T (2011) A dual porosity model of nutrient uptake by root hairs. New Phytologist 192: 676–688. Available: http://dx.doi.org/10.1111/j.1469-8137.2011.03840.x.
    Sponsors
    K.C.Z. was supported by Award No. KUK-C1-013-04 of the King Abdullah University of Science and Technology (KAUST). T. R. is a Royal Society University Research Fellow.
    Publisher
    Wiley
    Journal
    New Phytologist
    DOI
    10.1111/j.1469-8137.2011.03840.x
    PubMed ID
    21827499
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1469-8137.2011.03840.x
    Scopus Count
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