These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Differential NO3 - dependent patterns of NO3 - uptake in Pinus pinaster, Rhizopogon roseolus and their ectomycorrhizal association.
    Author: Gobert A, Plassard C.
    Journal: New Phytol; 2002 May; 154(2):509-516. PubMed ID: 33873433.
    Abstract:
    •  A different NO3 - dependent pattern of NO3 - uptake at low [NO3 - ] (0-0.1 mM) is shown in Pinus pinaster and in the ectomycorrhizal fungus Rhizopogon roseolus. In ectomycorrhizal symbiosis, the fungal pattern is pre-eminent. •  Net NO3 - uptake rates were deduced in plant and fungus from solution depletion measurements. Net NO3 - fluxes were estimated at the surface of mycorrhizal and nonmycorrhizal short roots, using NO3 - selective microelectrodes. •  In NO3 - starved seedlings, maximum NO3 - uptake rates were reached after 3 d of incubation in 0.05 mM NO3 - . In R. roseolus mycelia, NO3 - uptake rates did not change after withdrawing NO3 - for up to 7 d, or after adding NO3 - for 3 d. Net NO3 - fluxes in nonmycorrhizal short roots were increased twofold by a 3-d exposure to NO3 - whereas in ectomycorrhiza they were similar irrespective of the NO3 - pretreatment, but always higher than the fluxes measured in nonmycorrhizal roots. •  Ectomycorrhiza have a greater capacity to use NO3 - than nonmycorrhizal short roots, whatever the NO3 - concentration in the solution. This may give mycorrhizal plants a greater ability to use fluctuating concentrations of NO3 - in the soil solution.
    [Abstract] [Full Text] [Related] [New Search]