The importance of nutritional regulation of plant water flux

Michael Cramer, H. Hawkins, G.A. Verboom

    Research output: Contribution to journalArticle

    148 Citations (Scopus)

    Abstract

    Transpiration is generally considered a wasteful but unavoidable consequence of photosynthesis, occurring because water is lost when stomata open for CO2 uptake. Additionally, transpiration has been ascribed the functions of cooling leaves, driving root to shoot xylem transport and mass flow of nutrients through the soil to the rhizosphere. As a consequence of the link between nutrient mass flow and transpiration, nutrient availability, particularly that of NO3 −, partially regulates plant water flux. Nutrient regulation of transpiration may function through the concerted regulation of: (1) root hydraulic conductance through control of aquaporins by NO3 −, (2) shoot stomatal conductance (g s) through NO production, and (3) pH and phytohormone regulation of g s. These mechanisms result in biphasic responses of water flux to NO3 − availability. The consequent trade-off between water and nutrient flux has important implications for understanding plant distributions, for production of water use-efficient crops and for understanding the consequences of global-change-linked CO2 suppression of transpiration for plant nutrient acquisition.
    Original languageEnglish
    Pages (from-to)15-24
    JournalOecologia
    Volume161
    Issue number1
    DOIs
    Publication statusPublished - 2009

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    transpiration
    nutrient
    mass flow
    nutrients
    water
    shoot
    root hydraulic conductivity
    shoots
    aquaporins
    stomata
    xylem
    stomatal conductance
    global change
    nutrient availability
    plant hormones
    soil nutrients
    trade-off
    water use
    rhizosphere
    photosynthesis

    Cite this

    Cramer, Michael ; Hawkins, H. ; Verboom, G.A. / The importance of nutritional regulation of plant water flux. In: Oecologia. 2009 ; Vol. 161, No. 1. pp. 15-24.
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    Cramer, M, Hawkins, H & Verboom, GA 2009, 'The importance of nutritional regulation of plant water flux' Oecologia, vol. 161, no. 1, pp. 15-24. https://doi.org/10.1007/s00442-009-1364-3

    The importance of nutritional regulation of plant water flux. / Cramer, Michael; Hawkins, H.; Verboom, G.A.

    In: Oecologia, Vol. 161, No. 1, 2009, p. 15-24.

    Research output: Contribution to journalArticle

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    AU - Hawkins, H.

    AU - Verboom, G.A.

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    AB - Transpiration is generally considered a wasteful but unavoidable consequence of photosynthesis, occurring because water is lost when stomata open for CO2 uptake. Additionally, transpiration has been ascribed the functions of cooling leaves, driving root to shoot xylem transport and mass flow of nutrients through the soil to the rhizosphere. As a consequence of the link between nutrient mass flow and transpiration, nutrient availability, particularly that of NO3 −, partially regulates plant water flux. Nutrient regulation of transpiration may function through the concerted regulation of: (1) root hydraulic conductance through control of aquaporins by NO3 −, (2) shoot stomatal conductance (g s) through NO production, and (3) pH and phytohormone regulation of g s. These mechanisms result in biphasic responses of water flux to NO3 − availability. The consequent trade-off between water and nutrient flux has important implications for understanding plant distributions, for production of water use-efficient crops and for understanding the consequences of global-change-linked CO2 suppression of transpiration for plant nutrient acquisition.

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