Discussion
Which bacteria form symbiosis with some non-leguminous flowering plants (viz. Alnus, Casurina) for nitrogen fixation in soils ?
Answer: B
The bacteria are Frankia spp.
Frankia is a filamentous actinomycete that forms nitrogen-fixing root nodules with a group of non-leguminous flowering plants called actinorhizal plants, among them alder (Alnus), Casuarina (printed 'Casurina'), Myrica and sea buckthorn. These plants can colonise poor soils for this reason.
Bradyrhizobium nodulates legumes such as soybean. Azotobacter vinelandii and Klebsiella fix nitrogen as free-living bacteria and form no root nodule symbiosis.
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