Effect of H₂O₂ application during ‘Grande naine’-<i>Mycosphaerella fijiensis</i> interaction

Abstract

In Musa spp. considerable economical lost are cause by Mycosphaerella fijiensis infection around the world, that is why the study of the pathosystem constitute a priority. However, the main mechanisms activated in banana after infection are still unknown and are a limitation for a better understanding of this complex relationship. The objective of this study was to determine the effect of hydrogen peroxide (H2O2) application, on leaves of ‘Grande naine’ plants, on black leaf streak disease development (BLSD). For this purpose, the first three open leaves of banana plants were inoculated with the monoascosporic isolate of M. fijiensis CCIBP-Pf-83. At three days post-inoculation different H2O2 concentrations (10, 20, 30 and 40 mmol l-1) were sprayed to these plants as well as to non-inoculated ones. During the time course of the experiment for inoculated, sprayed plants and for control plants (infected with M. fijiensis) epidemiological variables as well as the area of necrotic lesions at 49 dpi were measured. The findings of this analysis showed that the early application of H2O2 have influence on the BLSD development. Keywords: banana, black leaf streak disease, hemibiotrophic, hydrogen peroxide