Mitigation of growth retardation effect of plant defense activator,acibenzolar-<Emphasis Type="Italic">S</Emphasis>-methyl,in amaranthus plants by plant growth-promoting rhizobacteria |
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Authors: | Chitra B Nair K N Anith Janardhanan Sreekumar |
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Institution: | (1) Department of Plant Pathology, College of Agriculture, Kerala Agricultural University, Vellayani, Thiruvananthapuram, Kerala, 695 522, India;(2) Central Tuber Crops Research Institute, Sreekaryam, Thiruvananthapuram, Kerala, India |
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Abstract: | Four rhizobacterial strains and acibenzolar-S-methyl (ASM), a chemical activator, which suppressed foliar blight of amaranthus (Amaranthus tricolor L.) caused by Rhizoctonia solani Kühn were evaluated for their effect on plant growth. The experiments were performed both under sterile and non-sterile soil
conditions, in the presence or absence of the pathogen. In all cases, plants treated with ASM showed significant reduction
in growth, as determined by shoot length, and shoot and root dry weight when compared to other treatments. The growth retardation
effect of ASM was more profound with respect to shoot length. Reduction in shoot length was least when plants were treated
with a combination of the chemical activator and Pseudomonas putida 89B61 under non-sterile soil conditions in the absence of the pathogen. Both under sterile and non-sterile soil conditions,
in the presence of the pathogen, reduction in shoot length due to application of ASM was diminished significantly when plants
were treated with rhizobacterial strain Pseudomonas fluorescens PN026R. Combined use of plant growth-promoting rhizobacteria (PGPR) and ASM was found to be beneficial as the growth retardation
effect of the plant defense activator was reduced by the growth-promoting ability of the rhizobacteria. |
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Keywords: | ASM ISR Rhizobacteria Amaranthus Rhizoctonia solani |
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