Root morphological traits that determine phosphorus-acquisition efficiency and critical external phosphorus requirement in pasture species

R.E. Haling, Z. Yang, N. Shadwell, R.A. Culvenor, A. Stefanski, Megan Ryan, G.A. Sandral, Daniel Kidd, Hans Lambers, R.J. Simpson

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    Abstract

    Annual pasture legume species can vary more than 3-fold in their critical external phosphorus (P) requirement (i.e. P required for 90% of maximum yield). In this work we investigated the link between root morphology, P acquisition and critical external P requirement among pasture species. The root morphology acclimation of five annual pasture legumes and one grass species to low soil P availability was assessed in a controlled-environment study. The critical external P requirement of the species was low (Dactylis glomerata L., Ornithopus compressus L., Ornithopus sativus Brot.), intermediate (Biserrula pelecinus L., Trifolium hirtum All.) or high (Trifolium subterraneum L.). Root hair cylinder volumes (a function of root length, root hair length and average root diameter) were estimated in order to assess soil exploration and its impact on P uptake. Most species increased soil exploration in response to rates of P supply near or below their critical external P requirement. The legumes differed in how they achieved their maximum root hair cylinder volume. The main variables were high root length density, long root hairs and/or high specific root length. However, total P uptake per unit surface area of the root hair cylinder was similar for all species at rates of P supply below critical P. Species that maximised soil exploration by root morphology acclimation were able to prolong access to P in moderately P-deficient soil. However, among the species studied, it was those with an intrinsic capacity for a high root-hair-cylinder surface area (i.e. long roots and long root hairs) that achieved the lowest critical P requirement.
    Original languageEnglish
    Pages (from-to)815-826
    JournalFunctional Plant Biology
    Volume43
    Issue number9
    DOIs
    Publication statusPublished - 7 Jun 2016

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    root hairs
    pastures
    phosphorus
    forage legumes
    soil
    acclimation
    surface area
    Trifolium hirtum
    Ornithopus compressus
    Ornithopus sativus
    Trifolium subterraneum
    Dactylis glomerata
    legumes
    grasses

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    Haling, R.E. ; Yang, Z. ; Shadwell, N. ; Culvenor, R.A. ; Stefanski, A. ; Ryan, Megan ; Sandral, G.A. ; Kidd, Daniel ; Lambers, Hans ; Simpson, R.J. / Root morphological traits that determine phosphorus-acquisition efficiency and critical external phosphorus requirement in pasture species. In: Functional Plant Biology. 2016 ; Vol. 43, No. 9. pp. 815-826.
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    Root morphological traits that determine phosphorus-acquisition efficiency and critical external phosphorus requirement in pasture species. / Haling, R.E.; Yang, Z.; Shadwell, N.; Culvenor, R.A.; Stefanski, A.; Ryan, Megan; Sandral, G.A.; Kidd, Daniel; Lambers, Hans; Simpson, R.J.

    In: Functional Plant Biology, Vol. 43, No. 9, 07.06.2016, p. 815-826.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Root morphological traits that determine phosphorus-acquisition efficiency and critical external phosphorus requirement in pasture species

    AU - Haling, R.E.

    AU - Yang, Z.

    AU - Shadwell, N.

    AU - Culvenor, R.A.

    AU - Stefanski, A.

    AU - Ryan, Megan

    AU - Sandral, G.A.

    AU - Kidd, Daniel

    AU - Lambers, Hans

    AU - Simpson, R.J.

    PY - 2016/6/7

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    AB - Annual pasture legume species can vary more than 3-fold in their critical external phosphorus (P) requirement (i.e. P required for 90% of maximum yield). In this work we investigated the link between root morphology, P acquisition and critical external P requirement among pasture species. The root morphology acclimation of five annual pasture legumes and one grass species to low soil P availability was assessed in a controlled-environment study. The critical external P requirement of the species was low (Dactylis glomerata L., Ornithopus compressus L., Ornithopus sativus Brot.), intermediate (Biserrula pelecinus L., Trifolium hirtum All.) or high (Trifolium subterraneum L.). Root hair cylinder volumes (a function of root length, root hair length and average root diameter) were estimated in order to assess soil exploration and its impact on P uptake. Most species increased soil exploration in response to rates of P supply near or below their critical external P requirement. The legumes differed in how they achieved their maximum root hair cylinder volume. The main variables were high root length density, long root hairs and/or high specific root length. However, total P uptake per unit surface area of the root hair cylinder was similar for all species at rates of P supply below critical P. Species that maximised soil exploration by root morphology acclimation were able to prolong access to P in moderately P-deficient soil. However, among the species studied, it was those with an intrinsic capacity for a high root-hair-cylinder surface area (i.e. long roots and long root hairs) that achieved the lowest critical P requirement.

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    DO - 10.1071/FP16037

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    VL - 43

    SP - 815

    EP - 826

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    JF - Functional Plant Biology

    SN - 1445-4408

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