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Abstract
Induced Systemic Resistance (ISR) has emerged as a potential tool in crop protection practices and suitable strategy for the reduction in the use of synthetic chemical pesticides and purely based on biological control. Induced systemic resistance can be defined as the phenomenon by which plants exhibit increased level of resistance to broad spectrum of phytopathogens by the prior activation of genetically programmed defence pathways . The colonization of roots with selected microbial strains can also lead to induction of systemic resistance, commonly denoted as ‘ISR’. Induction of systemic resistance by selected strains of microbial has been proved spatially separating the pathogen and microbes in plants. Several bacterial determinants of microbial origin strains viz., lipopolysaccharides (LPS), siderophores (Us, salicylic acid and EPS have been reported to be responsible for the induction of systemic resistance in host plants.The resistance of rice to several diseases, namely, brown spot (Helminthosporium oryzae Breda de Haan), stem rot (Leptosphaeria salvinii Catt.) and blast disease (Pyricularia oryzae Cav.) is stated to increase where the silica content of the plant particularly in the leaves and it has been raised by application of siliceous slags to the soil.A comparative study on the role of Purified EPS of silicate solubilizing bacterial isolates viz., SSB-8, SSB-11 and SSB-17 and ISR inducing chemicals, namely, salicylic acid, jasmonic acid and azibenzolar on enhance the growth and Pyricularia oryzae disease incidence in rice was studied under in vitro condition.