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Pak. J. Bot., 46(4): 1473-1477, 2014.

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MANAGEMENT OF ROOT ROT AND ROOT KNOT DISEASE OF MUNGBEAN WITH THE APPLICATION OF MYCORRHIZOSPHERIC FLUORESCENT PSEUDOMONAS UNDER FIELD CONDITION

SYEDA SADIA BOKHARI¹, SAMRAH TARIQ¹, SYED ABID ALI², VIQAR SULTANA³, JEHAN ARA⁴_, AND SYED EHTESHAMUL-HAQUE^1*

Abstract: The mycorrhizosphere is the region around a mycorrhizal fungus in which nutrients released from the hyphae increases microbial population and its activities. In this study five mycorrhizospheric fluorescent  Pseudomonas  (MRFP) were evaluated for biocontrol potential under field condition using mungbean (Vigna radiata) as test plant. MRFP-249 significantly reduced Fusarium solani, Rhizoctonia solani and Macrophomina phaseolina. Whereas MRFP246 and MRFP-247 were also found effective against M. phaseolina. Mycorrhizospheric fluorescent Pseudomonas were also found effective against root knot nematode by reducing the galls on roots and nematode’s penetration in roots. Highest fresh shoot weight and plant height was produced by MRFP-248. Plants grown in soil treated with Pseudomonas showed higher number of VAM spores around the mungbean roots than untreated control plants. The mycorrhizal symbiosis should not be considered merely as bipartite, plant-fungus interaction, but should instead include the associated microorganisms, particularly fluorescent Pseudomonas.

¹Agricultural Biotechnology & Phytopathology Laboratory, Department of Botany,

²HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences (ICCBS)

²Biotechnology & Drug Development Laboratory, Department of Biochemistry,

²Postharvest and Food Biochemistry Laboratory, Department of Food Science & Technology, University of Karachi, Karachi-75270, Pakistan.

^*Corresponding author e-mail: ehtesham12@hotmail.com