Induction of systemic resistance toColletotrichum falcatum in sugarcane by a synthetic signal molecule, acibenzolar-S-Methyl(CGA-245704) |
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| Authors: | A Ramesh Sundar R Velazhahan R Viswanathan P Padmanaban P Vidhyasekaran |
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| Institution: | (1) Sugarcane Breeding Institute, ICAR, 641007 Coimbatore;(2) Tamil Nadu Agricultural University, 641003 Coimbatore, India |
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| Abstract: | The effect of a novel synthetic signal molecule, acibenzolar-S-methyl (CGA-245704; benzo 1,2,3] thiadiazole-7-carbothioic
acid S-methyl ester), in inducing resistance in sugarcane against red rot disease caused by the fungusColletotrichum falcatum Went was studied. Application of CGA-245704 as a soil drench or along with marcotting rooting mixture induced resistance
in sugarcane to challenge inoculation withC. falcatum. When the pathogen was inoculated by the plug method, it caused discoloration in the untreated control stalk tissues; however,
in the stalk tissues pretreated with acibenzolar-S-methyl, pathogen colonization was considerably reduced. When the pathogen
was inoculated by nodal swabbing, its penetration was arrested in the sensitized stalk tissues. An induced systemic resistance
effect was found to persist up to 30 days in the pretreated cut canes. Increased phenolic content and accumulation of pathogenesis-related
(PR) proteins,viz., chitinase, β-1,3-glucanase and thaumatin-like protein (PR-5), were observed in sugarcane plants treated with acibenzolar-S-methyl. |
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| Keywords: | Chitinase β -1 3-glucanase induced systemic resistance red rot Saccharum officinarum thaumatin-like protein |
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