Polyamines were analyzed in 12 of N2-fixing aerobic eubacteria and other eubacteria, cyanobacteria, algae and ferns. sym-Homospermidine (homospermidine) was found to be widely distributed as a major polyamine in various N2-fixing eubacteria which belong to Azospirillum, Agromonas, Beijerinckia, Bradyrhizobium, Rhizobium and Xanthobacter. 3 species of Azotobater contained spermidine but not homospermidine, though they are N2-fixing eubactera. Homospermidine is also distributed in some eubacteria, i.e., the photosynthetic Rhodopseudomonas rutila and the sulfur-oxidizing Thiobacillus denitrificans, a cyanobacterium, Synechococcus sp., and in the cyanobacterium-symbiotic ferns, Azolla imbricata and Azolla japonica.
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Hamana et al. (1988) studied this question.
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