XVI International Botanical Congess

Volatile metabolites of 14 blue-green algae (BGA) have been screened against 3 strains of fungi pathogenic to jute and of 6 BGA against 1 strain of fungus pathogenic to rice. In vitro antifungal activity was detected in all strains, 13 and 11 strains of BGA against Rhizoctonia solanii, Sclerotinum rolfsii and Macrophomina phaseolina respectively. No antifungal activity was detected in the volatile metabolites of Calothrix marchica Dh 160, Fischerella muscicola Dh 145, Nostoc sp. Dh 148 on M. phaseolina and of Hapalosiphon sp. Dh 147 on S. rolfsii. All the 6 strains of BGA from rice field soil showed antifungal activity against Dreschslera oryzae. Non-volatiles of all the jute field BGA showed less inhibitory activity or no inhibition against jute pathogens but non-volatiles of all the rice field BGA showed inhibitory activity against the rice pathogen.