Co-Authors:
Patil, H.J., National Bureau of Agriculturally Important Microorganisms, Mau 275101, India, Department of Microbiology, School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India
Srivastava, A.K., National Bureau of Agriculturally Important Microorganisms, Mau 275101, India
Singh, D.P., National Bureau of Agriculturally Important Microorganisms, Mau 275101, India
Chaudhari, B.L., Department of Microbiology, School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India
Arora, D.K., National Bureau of Agriculturally Important Microorganisms, Mau 275101, India
Abstract:
Six actinomycetes isolates, namely Streptomyces toxytricini vh6, Streptomyces flavotricini vh8, S. toxytricini vh22, Streptomyces avidinii vh32, Streptomyces tricolor vh85 and vh41, an isolate of an unknown species of Actinomycetales, were tested for their efficacy in protecting tomato (Solanum lycopersicum) against Rhizoctonia solani under green house conditions. Actinomycetes treated plants showed better growth in terms of high chlorophyll content, higher phenylalanine ammonia lyase (PAL) activity and high total phenolic content. Qualitative and quantitative estimation of phenolic compounds from tomato leaves showed significant accumulation of six phenolic acids, gallic (29.02 μg g-1 fresh leaf wt), ferulic (11.44 μg g-1 fresh wt), cinnamic (56.84 μg g-1 fresh wt), gentisic (24.19 μg g-1 fresh wt), chlorogenic acid (1.72 μg g-1 fresh wt) and salicylic (0.39 μg g-1 fresh wt) acid, in actinomycetes treated plants. Biochemical profiling, when correlated with plant mortality in actinomycetes treated and untreated plants, indicated that isolates vh6 and vh8 offered 44.55% and 40.14% disease reductions, respectively compared to the control. These results established that these organisms have the potential to act as biocontrol agents. © 2011 Elsevier Ltd.
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