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Does Dryas integrifolia fix nitrogen?

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Symbiotic nitrogen fixation is found in plant taxa that also include non-nitrogen-fixing members. Strong evidence for the occurrence of nitrogen fixation comes from physiological measurements and the identification of the nitrogen fixing symbiont. This evidence has been provided for Dryas drummondii Richardson ex Hook. in the Rosaceae. However, while there have been numerous references to the nitrogen fixing ability of Dryas integrifolia Vahl., they can all be traced to a single report that did not provide strong evidence for nitrogen fixation. My attempts to establish nitrogen fixing nodules on vegetatively propagated plants from the field, or seedlings of D.integrifolia, using three different sources of Frankia, all failed. Since other host plants (Alnus viridis (Chaix) DC. subsp. crispa (Aiton) Turrill and Purshia tridentata (Pursh.) DC.) did produce nitrogen-fixing nodules under the same growth conditions, the ability of D.integrifolia to fix nitrogen should be considered suspect.

On retrouve la fixation symbiotique de l'azote chez des taxons de plantes qui incluent également des membres qui ne fixent pas l'azote. Les preuves solides de la présence de fixation d'azote proviennent de mesures physiologiques et de l'identification du symbiote fixateur d'azote. On a obtenu de telles preuves pour le Dryas drummondii Richardson ex Hook., appartenant aux Rosacées. Cependant, bien qu'il existe de nombreuses références sur la capacité du Dryas integrifolia Vahl., on peut toutes les ramener à une seule publication qui ne comporte pas de preuve solide sur la fixation d'azote. Les nombreuses tentatives conduites par l'auteur pour établir des nodules fixateurs de l'azote sur des plants multipliés végétativement à partir du terrain, ou sur des semis du D. integrifolia, en utilisant trois sources distinctes de Frankia ont toutes échoué. Puisque d'autres plantes (Alnus viridis (Chaix) DC. subsp. crispa (Aiton) Turrill et Pursia tridentata (Pursh.) DC.) ont produit des nodules fixateurs d'azote sous les mêmes conditions, on doit considérer la capacité du D. integrifolia à fixer l'azote comme suspecte.

Document Type: Research Article

Publication date: November 1, 2009

More about this publication?
  • Published since 1929, this monthly journal features comprehensive research articles and notes in all segments of plant sciences, including cell and molecular biology, ecology, mycology and plant-microbe interactions, phycology, physiology and biochemistry, structure and development, genetics, systematics, and phytogeography. It also publishes commentary and review articles on topics of current interest, contributed by internationally recognized scientists.

    Previously published as the Canadian Journal of Botany
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