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N2 fixation by bacteria in associative symbiosis with washed roots of 13Poaceae and 8 other noncultivated plant species in Finland was demonstrated by the acetylene reduction method. The roots most active in C2 H2 reduction were those ofAgrostis stolonifera, Calamagrostis lanceolata, Elytrigia repens , andPhalaris arundinacea , which produced 538 to 1,510 nmol of C2 H4 ·g−1 (dry weight)· h−1 when incubated at pO2 0.04 with sucrose (pH 6.5), and 70 to 269 nmol of C2 H4 · g−1 (dry weight)·h−1 without an added energy source and unbuffered.Azospirillum lipferum, Enterobacter agglomerans, Klebsiella pneumoniae , and aPseudomonas sp. were the acetylene-reducing organisms isolated. The results demonstrate the presence of N2 -fixing organisms in associative symbiosis with plant roots found in a northern climatic region in acidic soils ranging down to pH 4.0.

Root-Associated N 2 Fixation (Acetylene Reduction) by Enterobacteriaceae and Azospirillum Strains in Cold-Climate Spodosols