Levels of Plant Hormones Generated by Five Weak Pathogenic Isolates of Binucleate Rhizoctonia spp.

In order to study whether the weak pathogenic isolates of binucleate Rhizoctonia spp. can produce hormone that promote the growth of plants, high performance liquid chromatography (HPLC) was used to determine and compare the level of plant hormone produced by five weak pathogenic isolates of binucleate Rhizoctonia spp. The results showed that both mycelium and fermentation liquid of five isolates contained different ratios of zeatin (Z), zeatin riboside (ZR), gibberellin (GA3), and indole acetic acid (IAA), but hormone levels in fermentation liquid were higher than that in the mycelium. The Z, ZR and GA3 contents of mycelium and fermentation liquid of isolate X-4-5-1 belonging to binucleate Ceratobasidium spp. anastomosis group P (AG-P) was the highest, and the content of IAA was also higher. The GA3 and IAA contents in BS-YT-06-8 belonging to AG-L were the lowest. It is showed that weak pathogenic isolates of binucleate Rhizoctonia spp. can produce plant hormones, which provides the basis of hormonal characteristics for development and utilization.