Effects And Mechanism Of Ningnan Mycin Ferment On Rice Rhizoctoniarot And Tobacco Mosaic Virus (TMV)

For a better understanding of the optimum utilizing concentration of Ningnan Mycin Ferment on rice Rhizoctoniarot and Tobacco Mosaic Virus (TMV), two methods including restraining of indoor hypha and the speed of growth were used in this study. The inbibiting rate and toxin degree to three superior strains Fusarium oxysporum Schelcht, Rhizoctonia solan Kuhn and Pythium sPP of rice Rhizoctoniarot were tested after treated with Ningnan Mycin Ferment. And the field applying experiment was also performed to test the controlling effect and evaluate the health of rice seedling. The main results were as follows:1. The average inhibition rate of 2% Ningnan Mycin Ferment with the concentration of 200 times treatment to three superior strains of rice Rhizoctonia, Fusarium oxysporum Schelcht, Rhizoctonia solan Kuhn and Pythium sPP were 74.9%,65.9% and 69.6%, respectively on the 7th day after inoculation, ranked the first among the three treatments of 200 times,300 times and 400 times. It expressed the best control effect to Rhizoctonia solani hyphae growth rate on the three strains of rice Rhizoctoniarot. The 50% effect concentration (EC50) was 34.49 mg/L. The results also showed that the control effect on Rice Rhizoctoniarot were much better with the increasing of the using dosage of Ningnan Mycin Ferment, and the best dosage was 12.5g/m-25g/m. In addition, the results indicated Ningnan Mycin Ferment had an improving effect to the health of rice seeding growth.2. Ningnanmycin had a signifcant control effect on tobacco mosaic virus (TMV), and had the function of promoting growth. Applying concentration of 75 ppm worked best. The results of serum mensuration indicated that the main defense mechanism of Ningnan Mycin Ferment is to prolong the term of disease latency, inhibit the protein synthesize of TMV, decrease the consistence of toxin in plant and adjust plant metabolism to prevent the infection of virus TMV.