Abstract
Abstract An attempt to evaluate induced systemic resistance in anthurium against blight disease caused by Xanthomonas axonopodis pv. dieffenbachiae (Xad) was studied. Plant associated Pseudomonas taiwanensis and elicitor compounds were used for plant application in greenhouse experiments to evaluate the resistance development against anthurium blight. Application of rhizobacteria P1 and P9 resulted in significant disease reduction to 80.0% and 85.0% respectively. Application of salicylic acid, mancozeb and K2HPO4 also resulted in reduction of disease at 35 days after inoculation. Elevated production of defence related enzymes, proteins and phenols were observed. Application of rhizobacteria P1 resulted in highest production of polyphenol oxidase and phenolic compounds. Production of phenylalanine ammonia lyase was maximum in mancozeb treated plants compared to other treatments. Maximum production of peroxidase enzyme was found in K2HPO4 treated plants whereas application of elicitor compound salicylic acid caused maximum production of defence related proteins compared to other treatments. Confocal microscopic studies revealed that P1 and P9 treated plant petiole showed increased auto fluorescent emissions indicating the distribution of defence related secondary metabolites and phenolic compounds as compared to control plants. Root colonization assay displayed significant results implicating that Rif+ and Cyclo+ resistant rhizobacterial isolates could successfully grow in the root tissue, establishing endophytic association within the host tissue.
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