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Extensive physiological integration in Carex arenaria and Carex disticha in relation to potassium and water availability

Author:
  • Tina D'Hertefeldt
  • Ursula Falkengren-Grerup
Publishing year: 2002
Language: English
Pages: 469-477
Publication/Series: New Phytologist
Volume: 156
Issue: 3
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

Physiological integration between ramets is beneficial when acquiring heterogeneously distributed resources, and is hypothesized to occur when the benefits of resource sharing outweigh the costs. Our aim was to investigate if resource availability affected physiological integration in Carex arenaria and Carex disticha. Ramet systems were grown in high potassium and high water (K+ W+), high K and low water (K+ W-), or low K and high water (K- W+) for 1 month. Thereafter, water and K transport were traced with erythrosin and rubidium, respectively. Carex arenaria and C. disticha transported erythrosin over seven ramet generations and rubidium throughout the whole ramet system, but C. arenaria exported 20% more rubidium from the labelled shoot than C. disticha. A detailed analysis of subset of plants suggested that C. disticha in low K abundance shared more rubidium than in high K abundance, and that C. arenaria ramets in both K+ W- and K- W+ shared more resources than K+ W+ ramets. We demonstrated long-distance resource transport for K and water in C. arenaria and C. disticha. The distance of integration was not affected by resource availability in C. arenaria or C. disticha, but local concentrations of K showed marked and contrasting responses to nutrient and water treatment in both species.

Keywords

  • Ecology
  • tracers
  • extensive integrators
  • rubidium
  • potassium
  • erythrosin
  • clonal plants

Other

Published
  • Soil Ecology
  • ISSN: 1469-8137
Tina D'Hertefeldt
E-mail: tina [dot] dhertefeldt [at] biol [dot] lu [dot] se

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Biodiversity

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Research group

Soil Ecology Group

Projects

  • The effects of perennial biofuel crops (Salix, Phalaris, Populus) on soil ecosystem services
  • Weed-soil interactions in response to land management intensity
  • The effect of Brassica napus - Brassica rapa gene flow on volunteer persistence
  • SoilService

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