10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 2 2013 (April - June) The application effect of different formulations of lessThan i greaterThan Pseudomonas fluorescens lessThan /i greaterThan siderophore lessThan i greaterThan viz lessThan /i greaterThan ., control, lessThan i greaterThan Pseudomonas fluorescens lessThan /i greaterThan cells alone, lessThan i greaterThan Pseudomonas fluorescens lessThan /i greaterThan + Fe + siderophore complex, Siderophore alone, Fe + siderophore complex alone and challenge inoculation of lessThan i greaterThan Pyricularia oryzae lessThan /i greaterThan on the enhancement of growth and yield parameters and ISR mediated biocontrol against lessThan i greaterThan Pyricularia oryzae lessThan /i greaterThan in lowland rice cv.IR-50 was studied under pot culture condition. It was observed that the application of different formulations lessThan i greaterThan P lessThan /i greaterThan . lessThan i greaterThan fluorescens lessThan /i greaterThan siderophore augmented the growth and yield parameters lessThan i greaterThan viz lessThan /i greaterThan ., plant height, shoot and root dry weight, chlorophyll content and reduced the blast disease incidence in lowland rice crop to a marked level, but with variation among them. Interestingly, the application of lessThan i greaterThan P lessThan /i greaterThan . lessThan i greaterThan fluorescens lessThan /i greaterThan cells along with their Fe + siderophore complex augmented the above said parameters to a higher level followed by Fe + siderophore complex alone, siderophore alone, lessThan i greaterThan P lessThan /i greaterThan . lessThan i greaterThan fluorescens lessThan /i greaterThan cells alone treatments. Moreover, the same treatment altered the biochemical constituent lessThan i greaterThan viz lessThan /i greaterThan ., total and OD phenol content, reducing and non-reducing sugar levels and physiological activities lessThan i greaterThan viz lessThan /i greaterThan ., PO and PPO levels of rice plant to a higher level when compared to other treatments and suggesting the induction of systemic resistance in the host plant against the phytopathogen lessThan i greaterThan viz lessThan /i greaterThan ., lessThan i greaterThan Pyricularia oryzae lessThan /i greaterThan . The results of the present study clearly revealed the role of physiological status of the microorganism in siderophore mediated plant growth stimulation and induction of systemic resistance against lessThan i greaterThan Pyricularia oryzae lessThan /i greaterThan in lowland rice. P. AMUTHARAJ, C. SEKAR AND S. ESATH NATHEER Lowland rice, Pseudomonas fluorescens, PGPR, Siderophore, ISR, Pyricularia oryzae. 831-838