Isolation and identification of postharvest pathogenic bacteria of nectarine and antibacterial test of essential oils

Abstract

With 'Rose Red' nectarine as the test subject，postharvest pathogenic bacteria were isolated，purified，and identified. Their pathogenicity was determined using Koch's postulates，and the antibacterial activity of 28 types of plant essential oils against highly pathogenic bacteria was assessed.The results showed that a highly pathogenic pathogenic fungus TBZ1-9 was isolated and identified from peach fruits and had a high genetic relationship with Fusarium oxysporum. Among the 28 essential oils, mustard and Achyranthes essential oil (1000 μl/L) had the most significant antibacterial effect on strain TBZ1-9, with an antibacterial rate of 100%.500 μl/L Achyranthes essential oil had the best inhibitory effect on the TBZ1-9 strain, and the antibacterial rate was still >85% after 12 days of treatment. In summary, it was determined that the pathogen causing postharvest diseases of nectarines is Fusarium oxysporum, which is highly pathogenic. 500 μl/L Achyranthes essential oil has the best inhibitory effect on F. oxysporum.