Salicylic acid induced systemic resistant on peanut against Alternaria alternata |
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Authors: | Dr K Chitra N Ragupathi K Dhanalakshmi P Mareeshwari N Indra A Kamalakannan |
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Institution: | 1. Department of Plant Pathology , chitra76pat@yahoo.co.in;3. Department of Plant Pathology ,;4. Horticulture College &5. Research Institute, Tamil Nadu Agricultural University , Coimbatore, India |
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Abstract: | Abstract The effect of Salicylic Acid (SA) in inducing resistance in groundnut plants against Alternaria alternata was investigated. Foliar application of SA at the concentration of 1 mM significantly reduced the leaf blight disease intensity and increased the pod yield under glasshouse conditions. Changes in the activities of phenylalanine ammonium lyase, chitinase β-1,3 glucanase and in phenolic content on groundnut after application of SA and inoculation with A. alternate were studied. In SA-treated leaves (plants) an increase in phenolic content was observed five days after challenge inoculation with A. alternata in groundnut plants pretreated with SA. There was a marked increase in chitinase and pathogen inoculation in SA-treated leaves. In chitinase, β-1,3 glucanase activities were observed in response to plants with an increase in SA treated leaves. Foliar applications of SA-induced in peroxidase and polyphenol oxidase activities were observed upon challenge inoculation with pathogen. |
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Keywords: | Arachys hypogaea Alternaria alternata Salicylic acid induced resistance |
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