EFFICACY OF BENEFICIAL Penicillium sp. ON BIO-CONTROLLING SEVERITY AND DEFENCE ENZYME PHENYLALANINE AMMONIA-LYASE AGAINST LEAF BLIGHT DISEASE ON GREEN ONION PLANTS

Abstract

   In Vietnam, leaf blight disease is caused by Xanthomonas axonopodis pv. allii on green onion. Therefore, the purpose of this research was to find bio-solution with the beneficial rhizomatous fungus. The results showed that when treated at seven days before inoculation, Penicillium had the ability to reduce leaf blight severity up to 82.99% at day three after inoculation. Moreover, the value of enzyme PAL gained 25.22 μg/protein/min at 6 hours after inoculation. In addition, results also showed that Penicillium treatment at two days before inoculation reduced disease severity by 75% and 68.75% at days two and three after inoculation, respectively. Similarly, the PAL value of this treatment was 25.66 g/protein/min.