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豆类作物根内普遍存在着共生的固氮根瘤菌,已是众所皆知的.但是,能否在水稻,小麦、玉米等非豆类作物的根内也找到具有固氮能力的细菌.以开辟廉价氮源,有效地解决这类作物不断高产对不量氮肥的需求.这是引起各国生物学家广泛注意的问题.从这个设想出发,一九七二年,法国Y.Dommergues在水稻、玉米和热带草类上做了工作、谈到其根际非共生固氮作用.一九七四年,巴西Dobereiner从马唐根系分离到一种螺旋状固氮菌(Spirillum lipoferum),一年之后又使这种菌在玉米根上生长和固氮.
It is well known that there is a symbiotic Azotobacter in the root of leguminous crops, but whether nitrogen-fixing bacteria can be found in the roots of non-legume crops such as rice, wheat, corn and so on. Cheap nitrogen source, which effectively solves the problem of continuous high yield of such crops to nitrogenous fertilizer, which attracts a great deal of attention of biologists all over the world.From this idea, in 1972, France Y.Dommergues in rice, corn And tropical grasses talked about its non-symbiotic nitrogen fixation at the rhizosphere. In 1974, Brazil’s Dobereiner isolated a Spirillum lipoferum from the cayman roots and a year later Inbreds grow on maize roots and fix nitrogen.