Journal of Plant Process and Function

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Abstract: In order to Investe spraying by Plant Growth Promoting Bacteria (PGPB) and their metabolits on morphophysio-logical indices, qualitative indices and yield in Hashemi cultivar of rice, an experiment was arranged based on completely randomized block design with four replications in the greenhouse of the faculty of Agricultural Sci-ences in The University of Guilan in 2010. In this research, evaluated treatments consisted of: without spraying and fertilizer (control), without spraying and use of fertilizer, spraying with P.fluorescens strain 168, spraying with metabolits of P.fluorescens strain 168, inoculation with P.fluorescens strain 168, spraying with P.fluorescens strain 136, spraying with metabolits of P.fluorescens strain 136, inoculation with P.fluorescens strain 136, spraying with P.fluorescens strain 41, spraying with metabolits of P.fluorescens strain 41, inoculation with P.fluorescens strain 41. The results of experiment showed that the effect of different levels of bacteria were significant on quantitative and qualitative indices. Root inoculation with P.fluorescens strain 41 was higher than other treatments in all of the studied indices. However, the spraying with P.fluorescens strain 41 had lower effect than root inoculation with P.fluorescens strain 41 and P.fluorescens strain 136, but its results were better in com-pared with fertilizer and not spraying treatment. Results of spraying effect of metabolits from various bacteria were different that it could prove bacterial regulator effect on plant growth and development. Improvement of nutrient uptake by plant increased dry matter and minerals in plant stems and leaves, and thus increased seed yield. Results showed root inoculation with growth promoting bacteria was more effective compared with their spraying on quantitative and qualitative indices of rice, but they could be used as complementary of root inoculation with PGPR for plant yield improvement.

Keywords: Pesuodomonas fluorescens, Rice, Root inoculation, Spraying, Yield.

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