Antagonistic Activity Of Pseudomonas Isolates From Kolli Hills Against Fusarium Aphanidermatum

Nagaraja Suryadevara1,²*, P. Ponmurugan³, V. Kanimozhi1,2 and K. Manju³

¹Research & Development Department, Bharathiyar University, Coimbatore (India). ²Vivekananda College of Arts and Sciences for Women, Thiruchengode (India). ³Department of Biotechnology, K.S.R. College of Technology, Thiruchengode (India).

ABSTRACT: Plants Growth Promoting Rhizospheric bacteria (PGPR) are capable of increasing directly or indirectly crop yield. Pseudomonas has been found in large populations, which inhabit in the rhizosphere of several agriculture crops. The aim of this study was to determine the antagonistic activity in vitro and in vivo of Kolli Hill Pseudomonas (KLP) Isolates of plant growth promoting rhizobacteria against Fusarium aphanidermatum, and to assess their ability to produce IAA and to promote plant growth. The bacterial strains were tested to assess their fungal growth inhibition and plant growth stimulation. The plant growth assays were done in a modified microcosm experiment and in greenhouse conditions. The results demonstrated that these rhizobacteria produce IAA and exhibit antagonistic effect on Fusarium aphanidermatum inoculated in the substrate. Pseudomonas Sps out for their plant growth stimulation in maize and for the biological control exerted on Fusarium aphanidermatum. The strains of pseudomonas Sps. KLP6, KLP7 and KLP11 showed the best results in disease suppression, which was achieved up to 80%. These results have practical relevance, since potentially effective bacterial strains were selected and could be used in agriculture, for the enhancement of plant growth and disease control in maize crop.

KEYWORDS: Fusarium aphanidermatum; pseudomonas; Indole Acetic Acid (IAA); KLP

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