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Plant and Soil

, Volume 69, Issue 2, pp 293–297 | Cite as

Frankia growth and activity as influenced by water potential

  • W. A. Shipton
  • A. J. P. Burggraaf
Short Communications

Summary

Growth responses of Frankia isolates to decreasing water potential were monitored in systems where potentials were controlled by KCl, NaCl and Polyethylene glycol. The highest potential tested was −2 bar (basal medium). The general pattern emerging was that isolates fromAlnus glutinosa, A. viridis andComptonia peregrina showed declining growth at potentials below −2 to −5 bar. AMyrica gale isolate showed declining growth with decreasing potential. All isolates were more sensitive to decreases in potential in a matric controlled than an osmotic controlled system. They all showed approximately 50 percent growth reduction at −5 to −8 bar, and meagre growth at −16 bar after 35 days. The Comptonia isolate was the most vigorous at low potentials. Nitrogen fixation ability was monitored for two isolates. Highest specific activities were observed between −3 and −5 bar for the Myrica isolate and between −5 and −7.5 bar for theA. glutinosa isolate.

Key words

Ecology Frankia Nitrogen fixation Water potential 

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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1982

Authors and Affiliations

  • W. A. Shipton
    • 1
  • A. J. P. Burggraaf
    • 1
  1. 1.Researchgroup Biological Nitrogen Fixation, Botanical laboratoryState UniversityLeidenThe Netherlands

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