Abstract: Mycorhizae is a kind of beneficial symbiosis between certain soil fungi and plant roots. It is sorted two kinds, one is ectomycorrhiza, and the other is endomycorhizae. Endormycohorrhiza, especially Arbuscular mycorrhiza (AM), has a good relationship with agricultural production because it can infect most of crops. The main research achievements of AM from 1980s to 1990s in 20 century were reviewed in this article. (1) The effect of AM on increase of phosphate fertilizer use efficiency; (2) Dual inoculation of rhizobium and mycorrhizal fungi in leguminous plants was important for improving phosphorus uptake from soil and promoting nitrogen fixation ability of rhizobia; (3) Inoculation of rhizobium and mycorrhiza can increase water use efficiency for crops, making it double compared to non-inoculation of AM; (4) Inoculation of AM has a remarkable effect of promoting synthesis of alkaloid and volatile oil of D. stramonium and S. tenuifolia as two medicinal plants; (5) Two new recorded species of S. sinuosa and E. infrequens were isolated in soil from Nanning City of Guangxi, and Beijing; Methodology of AM was carried on as well. The Ri T-DNA of A. rhizogenes transferred to the fleshy root slice of carrot inducing lots of fibril that grew well without additional hormone, because carrot root has the gene of producing plant hormone. The root symbioses with S. sinuosa induced the formation of a lot of hyphaes and spores of AM. This technique is very useful for the study of mycorhizae bionomics. Field experiments of mycorhizae application were conducted in several counties of Mianyang City in Sichuan Province. Marked effects of the inoculant were gained in barley, wheat, corn, water melon and fruits trees. We taught farmers to make the inoculant of AM and trained them for inoculation. Application of AM not only increased the production of crops, but also enhanced the content of sugar in melon.

Key words: Arbuscular mycorrhiza , Symbiosis , Field application