Induction of phenolics and defense-related enzymes in coconut (Cocos nucifera L.) roots treated with biocontrol agents
By M. Karthikeyan, K. Radhika, S. Mathiyazhagan, R. Bhaskaran, R. Samiyappan, R. Velazhahan. 2006
107 citations recorded by the source corpus.
The 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 palms.
Subfields: Molecular Biology, Plant Science
View Paper: https://www.semanticscholar.org/paper/48ee140945a6b8c3ba0d2fcdc7445e72187d4eb4
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Citations in the corpus
- Trichoderma harzianum- mediated reprogramming of oxidative stress response in root apoplast of sunflower enhances defence against Rhizoctonia solani (2011, background): “were found to be effective in inducing activities of defence-related proteins and fungitoxic phenolic compounds in coconut ( Karthikeyan et al. 2006 )a nd cucumber (Yedidia et al. 2003).”
- Mechanism of Phosphate Solubilization and Physiological Functions of Phosphate-Solubilizing Microorganisms (2014, background): “In a study, a rapid increase in PO activity was recorded in coconut (Cocos nucifera L.) treated with a mixture of P. fluorescens, T. viride and chitin which contributed to induced resistance against invasion by Ganoderma lucidum, the causal agent of Ganoderma disease (Karthikeyan et al. 2006).”
- Trichoderma harzianum L1 as a potential source for lytic enzymes and elicitor of defense responses in chickpea (Cicer arietinum L.) against wilt disease caused by Fusarium oxysporum f. sp. ciceri. (2009, background): “Several studies have shown that phenolics and PAL activity are induced in chickpea upon treatment with pathogen (Karthikeyan et al., 2006; Arfaoui et al., 2007).”