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Related Experiment Videos

Root adaptation and nitrogen source acquisition in natural ecosystems.

Matthew H. Turnbull1, Susanne Schmidt, Peter D. Erskine

  • 1Department of Plant and Microbial Sciences, University of Canterbury, Christchurch, New Zealand.

Tree Physiology
|November 1, 1996
PubMed
Summary

Australian plants utilize diverse nitrogen sources beyond nitrate, including ammonium and organic nitrogen. Mycorrhizal fungi and specialized root structures enhance plants

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Area of Science:

  • Plant Ecology
  • Plant Physiology
  • Soil Science
  • Mycology

Background:

  • Nitrate reductase activity (NRA) was low across diverse Australian plant communities, suggesting nitrate is not the sole nitrogen source.
  • Leaf nitrogen concentration showed a weak correlation with NRA, further indicating alternative nitrogen assimilation pathways.
  • Soil analyses revealed higher ammonium prevalence than nitrate, alongside significant concentrations of soluble organic nitrogen.

Purpose of the Study:

  • To investigate the nitrogen source utilization strategies of Australian plant communities.
  • To determine the role of root adaptations and mycorrhizal associations in broadening nitrogen uptake.
  • To assess the capacity of plants to utilize organic nitrogen sources.

Main Methods:

Related Experiment Videos

  • (15)N labeling experiments to trace nitrogen uptake preferences in tree species.
  • Analysis of soil solutions to quantify nitrogen species concentrations.
  • Sterile culture experiments evaluating seedling growth on various inorganic and organic nitrogen sources.
  • Assessment of nitrogen incorporation from labeled organic sources in a non-mycorrhizal species.

Main Results:

  • Tree species showed a preference for ammonium over nitrate uptake.
  • Non-mycorrhizal Eucalyptus seedlings grew on mineral nitrogen but not most organic forms (except glutamine).
  • Mycorrhizal seedlings demonstrated robust growth on various organic nitrogen sources and assimilated significant organic nitrogen.
  • The non-mycorrhizal Hakea species with cluster roots incorporated (15)N-labeled organic nitrogen.

Conclusions:

  • Mycorrhizal associations are crucial for enabling plants to utilize a broader spectrum of organic nitrogen sources.
  • Root adaptations, such as cluster roots, can also contribute to organic nitrogen utilization.
  • Plant nitrogen nutrition in these Australian ecosystems relies on a diverse array of inorganic and organic sources.