Affiliation:
1. Division of Plant Industry, Commonwealth Scientific and Industrial Research Organisation, G.P.O. Box 1600, Canberra City Australian Capital Territory 2601, Australia
Abstract
Bradyrhizobium
strains isolated from the nonlegume
Parasponia
spp. formed a group of strains that were highly competitive for nodulation of
P. andersonii
when paired with strains isolated from legumes. Strains from legumes, including those of similar effectiveness to NGR231 and CP283, were not able to form nodules as single occupants on
P. andersonii
in the presence of
Parasponia
strains. However, NGR86, an isolate from
Macroptilium lathyroides
, jointly occupied one-third of the nodules formed with each of the three strains isolated from
Parasponia
spp. Time taken for nodules to appear may have influenced the outcome of competition, since CP283 and all isolates from legumes were slow to nodulate
P. andersonii
. Among the
Parasponia
strains, competitiveness for nodulation of
P. andersonii
was not associated with effectiveness of nitrogen fixation. The highly effective strain CP299 was a poor competitor when paired with the least effective strain NGR231. CP283 was the least competitive of the
Parasponia
strains but was still able to dominate nodules when paired with legume isolates. Dual occupancy was high, up to 67% when the inoculum contained CP299 and CP273. Both the Muc
+
and Muc
-
types of CP283 form a symbiosis of similar effectiveness and were similarly competitive at high inoculation densities, but the Muc
-
form was more competitive at low inoculum densities. Both forms frequently occupied the same nodule.
Bradyrhizobium
strains isolated from
Parasponia
spp. may have specific genetic information that favor their ability to competitively and effectively infect plants in the genus
Parasponia
(Ulmaceae) outside the Leguminosae.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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