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Frankia alni

Frankia alni is an actinobacterium species that is in symbiosis with alder (circumpolar and mountains) and myrica (poor soils from all continents except Australia) permitting these plants to fix nitrogen and thus initiate ecological successions on volcanic debris, glacial morraines and forest soils after fires. The isolate ACN14a which genome was sequenced is from a root nodule of a green alder tree (Alnus viridis subsp crispa) growing on a sand dune in Tadoussac, Canada. The bacteria present in nodules were described for the first time in 1866 but it took close to a century  for the first described isolate to become available due to Frankia's slow growth rate and the widespread presence of contaminants in nodule tissues.

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