Effect of antifungal agents on the physiological activities of towo plant pathogenic fungi: <i>Rhizoctonia solani </i> & <i>Fusarium oxysporum</i>

Abstract

Each of the antifungal compounds extracted from each of the antagonistic microorganisms was found to has an inhibitory effect on Rhizoctonia solani and Fusarium oxysporum. Four antifungal compounds were found to be the most inhibitory than the other compounds. The first one from Eupenicillium senticosum, the second from Streptomyces aurantiacus, the third from Curtobacterium pusillum and the last one from Saccharomyces unispora respectively. The first three compounds were active against R. solani, while the last one was active against F. oxysporum. All the four compounds reduce or inhibit the growth of Rhizoctonia solani and Fusarium oxysporum. They also reduced the carbohydrate concentrations, as well as reducing the nitrogen content (total nitrogen, soluble nitrogen and protein nitrogen). Regarding their effects on the enzyme activity, the active compounds increased the activity of fumarase, malic dehydrogenase and succinic dehydrogenase, the activity of catalase enzyme of both R. solani and F. oxysporum was sharply decreased by such compounds as compared to control.Egyptian Journal of Biotechnology Vol. 25 (1) 2007: pp.159-168