Abstract:

In order to study biocontrol effects of arbuscular mycorrhizal (AM) on two leaf spots, peanut (Arachis hypogaea L.) black spot (Cercosporium personatuma) and peanut net blotch (Phoma arachidicola), the growth-promoting effects of AM fungus on peanut, and as a result, laying a foundation for the development of green manure, peanut cultivar Huayu 22 inoculated with AM fungus Glomus mosseae in a pot experiment, under natural infection conditions, biocontrol effects of G. mosseae on peanut black spot and peanut net blotch, growth indices including plant height, the numbers of branches or pods, dry mass of pods, aboveground or underground dry mass of peanut were investigated. The results indicated that, inoculation peanut with G. mosseae significantly improved plant height, the numbers of branches or pods, dry mass of pods, aboveground dry mass of peanut, and induced systemic acquired resistance to the two leaf spots. Control effect on peanut black spot was 5.4%, whereas on net peanut blotch was 10.2%. One of the mechanisms of G. mosseae improving resistance to the two diseases was promoting growth due to AM colonization may allow compensation for damage caused by the diseases. The results showed that G. mosseae isolated by us is a strain which can both promote the growth and control two leaf spots of peanut.