ISOLATION AND CHARACTERIZATION OF PSEUDOMONAS FLUORESCENS FROM RICE FIELDS

T Meera, P Balabaskar
2012 International Journal of Food, Agriculture and Veterinary Sciences   unpublished
In the recent times, there has been a reversed interest in the search of plant growth promoting rhizobacteria (PGPR) for sustainable crop production. Rice is an economically important food crop, which is subjected to infection by a host of fungal, viral and bacterial pathogens. Thirty five (Pf1.......Pf35) isolates of Pseudomonas fluorescens were isolated from the rizosphere of rice fields. These were tested against S. oryzae in dual culture method. Among these, seven (Pf4, Pf6, Pf8, Pf11,
more » ... f6, Pf8, Pf11, Pf13, Pf15 and Pf20) isolates were showed bright fluorescence under UV light were further tested. All the cultural and biochemical studies confirmed them to be P. fluorescens. The isolates also showed positive response for siderophore production and plant growth promoting activity on rice cultivar ADT 36. Among these isolates Pf 13 and Pf 04 showing on par root length and shoot length. Both the Pf13 and Pf04 isolates were found significantly superior than other isolates in increasing the shoot length and root length over control. The isolates Pf13 was recorded high vigor index (3830) followed by Pf04 (3648). The least vigor index was recorded by Pf08 (2631).
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