Four Frankia isolates ofAlnus glutinosa were studied in relation to the location of infectible cells along 10 day oldAlnus glutinosa roots. For all isolates tested a clear zonation in infectible cells was found just above the position of the root tip at the time of infection.
Differences in the length of the root nodule induction zone were observed, depending on the isolate and possibly also depending on the age of the Frankia culture tested. A second infection zone was found which was the only infectible zone by an isolate with a retarded infective potential (LDAgp1). Root hair deformation is clearly correlated with the presence of Frankia near axenic alder plants, although actual contact of root hairs and the symbiont is not prerequisite. Some evidence is presented indicating that the type of deformation might be correlated with the Frankia strain.
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Burggraaf, A.J.P., Van Der Linden, J. & Tak, T. Studies on the localization of infectible cells onAlnus glutinosa roots. Plant Soil 74, 175–188 (1983). https://doi.org/10.1007/BF02143608
- Alnus glutinosa
- Root hair deformation
- Root nodule