Alder tree root nodules form a symbiosis with nitrogen-fixing bacteria

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Photo credit: © Henri Koskinen / Alamy / Afripics
License: Royalty Free
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Keywords: alder, alnus, bacteria, endosymbionts, finland, fixation, fixing, gray, grey, incana, incarnata, march, nitrogen, nitrogen-fixing, nodulation, nodule, nodules, relation, rhizobia, root, soil, speckled, spring, spring-time, symbiosis, symbiotic