BIOLOGICAL CONTROL OF SHEATH BLIGHT OF RICE - INDUCTION OF SYSTEMIC RESISTANCE IN RICE BY PLANT-ASSOCIATED PSEUDOMONAS SPP

摘要

In previous studies on the biological suppression of fungal diseases of rice with plant-associated rhizosphere bacteria we had reported that production of antifungal antibiotic (afa) by the bacterium is the major mechanism involved. In this study we report that the induction of systemic resistance in rice by strains of pseudomonads leads to suppression of sheath blight. A molecular tracking system (lacZY gene) was used to engineer strains of Pseudomonas fluorescens 7-14 and P. putida V14i. We used the lacZ expression as tracking system to monitor the survival and migration of the biocontrol agents. In spite of the absence of bacteria on plant surfaces, the endophytic bacteria present in the stem led to suppression of rice sheath blight caused by Rhizoctonia solani up to 18%. [References: 25]