INDUCTION OF SYSTEMIC RESISTANCE IN SOYBEAN PLANTS AGAINST Corynespora cassiicola BY Pseudomonas spp.

MICHAVILA, GABRIELA; ZENOFF, ANA; CARAM DI SANTO, MARÍA CAROLINA; DE GREGORIO, PR; FILIPPONE, MARÍA PAULA; ADLER, CONRADO; VINCENT, PAULA

Congreso; SAIB; 2015

The ring spot disease of soya caused by Corynespora cassiicola, is commonly found in the north Argentineansoybean-growing zones. The inadequate use of agrochemical products to treatment this disease is dangerous for the environment, so is interesting to search effective management alternatives that do not select resistance in thepathogen and that can be produced without petrochemical industry energy use. One alternative is the use of biological control agents. Previously, our laboratory made a screening for rhizosphere bacteria that are able to promote plant growth or to induce systemic resistance in the soybean plant. In this work, we evaluated the ring spot disease control using a Pseudomonas isolated from rhizosphere of soybean. To this end, the soybean plants were inoculated by foliar application with a bacterial suspension three and seven days before infection with the pathogen C. cassiicola and kept in controlled conditions to favor the disease development. After the evaluation for ten days, a protective effect against the disease was observed. In addition, evaluation of biochemical markers such as oxidative burst, the accumulation of phenolic compounds and callose was performed. Our results indicate that this Pseudomonas isolated induce plant resistance and could be used as a "bioinoculant" for disease control, contributing to the development of sustainable agriculture.