First Isolation and Identification of <i>Neopestalotiopsis clavispora</i> Causing Postharvest Rot of <i>Rosa sterilis</i> and Its Control with Methyl Jasmonate and Calcium Chloride
2022
Tingfeng Shi | Tingtiao Pan | Meiting Guo
Postharvest rot is a major issue in fruit. However, the cause of postharvest rot on <i>R. sterilis</i> fruit has not been clarified, and there are few studies on the disease control. In this study, the fungus causing postharvest rot is isolated from the symptomatic <i>R. sterilis</i> fruit, and identified by morphological characteristic, pathogenicity test and molecular identification. Moreover, the effects of methyl jasmonate (MeJA) or calcium chloride (CaCl<sub>2</sub>) alone and their combination on disease resistance to fruit rot were assessed by the determination of defense-related enzyme activity and other indicators. <i>N. clavispora</i> was identified as the main fungus causing the postharvest rot of <i>R. sterilis</i> fruit. The infected fruits were treated with MeJA and CaCl<sub>2</sub>, and these partially controlled the disease, were additive in effectiveness when used together, increased retention of vitamin C content and fruit firmness, and both enhanced and improved the retention of PAL, POD and PPO activities. The treatment of 500 μL/L MeJA and 3% CaCl<sub>2</sub> resulted in the high inhibition of the disease. To our knowledge, this is the first report of <i>N. clavispora</i> causing <i>R. sterilis</i> fruit rot, and the combined treatment is a promising method for controlling postharvest rot on <i>R. sterilis</i> fruit.
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