Nutrient availability moderates transpiration in Ehrharta calycina

Michael Cramer, V. Hoffmann, G.A. Verboom

    Research output: Contribution to journalArticle

    61 Citations (Scopus)

    Abstract

    Transpiration-driven 'mass-flow' of soil-water can increase nutrient flow to the root surface. Here it was investigated whether transpiration could be partially regulated by nutrient status.Seeds of Ehrharta calycina from nine sites across a rainfall gradient were supplied with slow-release fertilizer dibbled into the sand surrounding the roots and directly available through interception, mass-flow and diffusion (dubbed 'interception'), or sequestered behind a 40-mu m mesh and not directly accessible by the roots, but from which nutrients could move by diffusion or mass-flow (dubbed 'mass-flow').Although mass-flow plants were significantly smaller than interception plants as a consequence of nutrient limitation, they transpired 60% faster, had 90% higher photosynthesis relative to transpiration (A/E), and 40% higher tissue P, Ca and Na concentrations than plants allowed to intercept nutrients directly. Tissue N and K concentrations were similar for interception and mass-flow plants.Transpiration was thus higher in the nutrient-constrained 'mass-flow' plants, increasing the transport of nutrients to the roots by mass-flow. Transpiration may have been regulated by N availability, resulting in similar tissue concentration between treatments. It is concluded that, although transpiration is a necessary consequence of photosynthetic CO2 uptake in C-3 plants, plants can respond to nutrient limitation by varying transpiration-driven mass-flow of nutrients.
    Original languageEnglish
    Pages (from-to)1048-1057
    JournalNew Phytologist
    Volume179
    Issue number4
    DOIs
    Publication statusPublished - 2008

    Fingerprint

    Ehrharta calycina
    mass flow
    nutrient availability
    transpiration
    Food
    nutrients
    slow-release fertilizers
    nutrient transport
    Fertilizers
    Photosynthesis
    Seeds

    Cite this

    Cramer, Michael ; Hoffmann, V. ; Verboom, G.A. / Nutrient availability moderates transpiration in Ehrharta calycina. In: New Phytologist. 2008 ; Vol. 179, No. 4. pp. 1048-1057.
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    title = "Nutrient availability moderates transpiration in Ehrharta calycina",
    abstract = "Transpiration-driven 'mass-flow' of soil-water can increase nutrient flow to the root surface. Here it was investigated whether transpiration could be partially regulated by nutrient status.Seeds of Ehrharta calycina from nine sites across a rainfall gradient were supplied with slow-release fertilizer dibbled into the sand surrounding the roots and directly available through interception, mass-flow and diffusion (dubbed 'interception'), or sequestered behind a 40-mu m mesh and not directly accessible by the roots, but from which nutrients could move by diffusion or mass-flow (dubbed 'mass-flow').Although mass-flow plants were significantly smaller than interception plants as a consequence of nutrient limitation, they transpired 60{\%} faster, had 90{\%} higher photosynthesis relative to transpiration (A/E), and 40{\%} higher tissue P, Ca and Na concentrations than plants allowed to intercept nutrients directly. Tissue N and K concentrations were similar for interception and mass-flow plants.Transpiration was thus higher in the nutrient-constrained 'mass-flow' plants, increasing the transport of nutrients to the roots by mass-flow. Transpiration may have been regulated by N availability, resulting in similar tissue concentration between treatments. It is concluded that, although transpiration is a necessary consequence of photosynthetic CO2 uptake in C-3 plants, plants can respond to nutrient limitation by varying transpiration-driven mass-flow of nutrients.",
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    Nutrient availability moderates transpiration in Ehrharta calycina. / Cramer, Michael; Hoffmann, V.; Verboom, G.A.

    In: New Phytologist, Vol. 179, No. 4, 2008, p. 1048-1057.

    Research output: Contribution to journalArticle

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    AU - Hoffmann, V.

    AU - Verboom, G.A.

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    N2 - Transpiration-driven 'mass-flow' of soil-water can increase nutrient flow to the root surface. Here it was investigated whether transpiration could be partially regulated by nutrient status.Seeds of Ehrharta calycina from nine sites across a rainfall gradient were supplied with slow-release fertilizer dibbled into the sand surrounding the roots and directly available through interception, mass-flow and diffusion (dubbed 'interception'), or sequestered behind a 40-mu m mesh and not directly accessible by the roots, but from which nutrients could move by diffusion or mass-flow (dubbed 'mass-flow').Although mass-flow plants were significantly smaller than interception plants as a consequence of nutrient limitation, they transpired 60% faster, had 90% higher photosynthesis relative to transpiration (A/E), and 40% higher tissue P, Ca and Na concentrations than plants allowed to intercept nutrients directly. Tissue N and K concentrations were similar for interception and mass-flow plants.Transpiration was thus higher in the nutrient-constrained 'mass-flow' plants, increasing the transport of nutrients to the roots by mass-flow. Transpiration may have been regulated by N availability, resulting in similar tissue concentration between treatments. It is concluded that, although transpiration is a necessary consequence of photosynthetic CO2 uptake in C-3 plants, plants can respond to nutrient limitation by varying transpiration-driven mass-flow of nutrients.

    AB - Transpiration-driven 'mass-flow' of soil-water can increase nutrient flow to the root surface. Here it was investigated whether transpiration could be partially regulated by nutrient status.Seeds of Ehrharta calycina from nine sites across a rainfall gradient were supplied with slow-release fertilizer dibbled into the sand surrounding the roots and directly available through interception, mass-flow and diffusion (dubbed 'interception'), or sequestered behind a 40-mu m mesh and not directly accessible by the roots, but from which nutrients could move by diffusion or mass-flow (dubbed 'mass-flow').Although mass-flow plants were significantly smaller than interception plants as a consequence of nutrient limitation, they transpired 60% faster, had 90% higher photosynthesis relative to transpiration (A/E), and 40% higher tissue P, Ca and Na concentrations than plants allowed to intercept nutrients directly. Tissue N and K concentrations were similar for interception and mass-flow plants.Transpiration was thus higher in the nutrient-constrained 'mass-flow' plants, increasing the transport of nutrients to the roots by mass-flow. Transpiration may have been regulated by N availability, resulting in similar tissue concentration between treatments. It is concluded that, although transpiration is a necessary consequence of photosynthetic CO2 uptake in C-3 plants, plants can respond to nutrient limitation by varying transpiration-driven mass-flow of nutrients.

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