Effect of inhibitory substances and pesticide on streptomyces sp isolated from soil under cultivation of curcuma longa l
In the present day soil pollution is major problem because different types of pesticides and non biodegradable substance which are used to control plant pest. The residual component of pesticide diffuses into the soil and causes soil pollution. Some microorganisms like actinomycetes have ability to degrade these components and control the soil pollution and water pollution. In Ayurved system of medicine the rhizome portion of Curcuma longa L. was used as an anti-inflammatory and antiseptic. Antimicrobial substances released from these plants diffuse into the surrounding soil area of the plant. Actinomycetes which grow in these areas were resistant to these substances. Hence considerable attention had been given in studying the effect of pesticides and inhibitory substances on actinomycetes especially Streptomyces sp. isolated from soil under cultivation of Curcuma longa L. The present study deals with effect of pesticides and inhibitory substances like Confidor, Carbaryl, Follidol and Diethane M- 45, dettol, phenol, sodium azide, and crystal violet. The results were recorded on the basis of presence or absence of growth. Total seven Streptomyces isolates were found resistant against Confidor and Carbaryl each, five were resistant against Diethane M- 45 and four were resistant against follidol. Total nine Streptomyces sp. were found sensitive to dettol, two were resistant against phenol and five were resistant against Sodium azide and Crystal violet. From the study performed we conclude that Streptomyces sp. which is resistant to pesticide and other inhibitory substances can be used to degrade the residual components of pesticide which are released into the soil. It may have better option to prevent soil pollution.
Keywords: Streptomyces sp., Curcuma longa L., Pesticides, inhibitory substances, soil pollution.