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29 - 30.page04 - Symbiotic N—fixation by legumes Bacteria...

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Unformatted text preview: Symbiotic N—fixation by legumes: Bacteria obtain plant metabolic products for its use. R/liznbium species are specific for an individual species of legume. Legumes have traditionally been used as a rotational crop to provide nitrogen for a subsequent crop Symbiotic N—fixation by non-legumes: There are about 160 species of plants that form symbiotic relationships (root nodules) with tIcri/mnzywm and non-legume bacteria. Woody Shrubs Such as. Pm‘S/Iiu. Cmnpmniu. and Almm‘ form symbiotic nodules \yith1[crinomyccrcs (F mnkiu) and are very important for the nitrogen balance of forests etc. Symbiotic N—fixation by non-legumes: Fixation occurs in plants that are nodulated by actinomycete fungi of the genus Fran/(in. Although the basic nitrogen fixation process is the same with these plants as with legumes. most of their nitrogen contribution is in the form of falling leaves and decaying litter. Their nodules are perem1ial rather than amiual. Examples of this group of plants are alder. buckthorn and Russian olive. ...
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