Ineffective Frankia in wet alder soils

Although most known Frankia are able to fix atmospheric dinitrogen gas, occasionally some strains have been isolated (from root nodules) which are unable to do so, neither freeliving, nor in symbiosis with a host plant. Such (Fix) Frankia strains are called ineffective (in nitrogen fixation), and lack the typical vesicles (both in free-living form and inside noclules), in which nitrogen fixation in effective Frankia strains is generally concentrated. Ineffective Frankia strains have been isolated from a wide variety of host plant species but until recently, little was known about their ecology, or their phylogenetic position with respect to other Frankia strains.

Zie: Summary

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