Induction of Phenolics and Defense-related Enzymes in Coconut (cocos Nucifera L.) Roots Treated with Biocontrol Agents

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dc.contributor.authorKarthikeyan, M.
dc.contributor.authorRadhika, K.
dc.contributor.authorMathiyazhagan, S.
dc.contributor.authorBhaskaran, R.
dc.contributor.authorSamiyappan, R.
dc.contributor.authorVelazhahan, R.
dc.date.accessioned2014-05-05T10:47:16Z
dc.date.available2014-05-05T10:47:16Z
dc.date.issued2006-09
dc.description.abstractThe effect of soil application of biocontrol agents (Pseudomonas fluorescens, Trichoderma viride and T. harzianum) in combination with chitin on induction of phenolics and defense enzymes in coconut roots infected with Ganoderma lucidum, the causal agent of Ganoderma disease, was investigated. Soil application of these biocontrol formulations in combination with chitin induced a significant increase in the activities of peroxidase (PO), polyphenol oxidase (PPO), phenylalanine ammonia-lyase (PAL), chitinase and b-1,3-glucanase in the G. lucidum infected palms. Activities of both PAL and PO reached maximum levels within 3 d while the activity of PPO reached the maximum level 6 d after application of a mixture of P. fluorescens, T. viride and chitin. Isozyme analysis revealed that unique PO3 and PPO2 isozymes were induced in coconut palms treated with P. fluorescens + T. viride + chitin. Accumulation of phenolics was recorded 3 d after treatment and reached maximum levels 9 d after treatment application. Activity of chitinase was significantly increased from the third day after treatment imposition and continued to increase up to 9 to 12 d in all treatments. Chitinase isozyme analysis revealed that a unique Chit3 isoform was induced in coconut roots treated with P. fluorescens + T. viride + chitin. The b-1,3-glucanase activity was maximum 9 d after treatment application. The mechanisms by which P. fluorescens + T. viride + chitin reduced the incidence of Ganoderma disease in coconut may be related to its ability to induce defense mechanisms in coconut palmsen_US
dc.identifier.citationBrazilian Journal of Plant Physiology Vol.: 18, No.: 3, September 2006 [Page 367-377]en_US
dc.identifier.urihttp://hdl.handle.net/123456789/954
dc.language.isoenen_US
dc.publisherSociedade Brasileira de Fisiologia Vegetalen_US
dc.subjectChitinen_US
dc.subjectGanoderma diseaseen_US
dc.subjectinduced systemic resistanceen_US
dc.subjectpathogenesis-related proteinsen_US
dc.subjectphenolicsen_US
dc.subjectPseudomonas fluorescensen_US
dc.subjectTrichodermaen_US
dc.titleInduction of Phenolics and Defense-related Enzymes in Coconut (cocos Nucifera L.) Roots Treated with Biocontrol Agentsen_US
dc.typeArticleen_US

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