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Use of hot water, combination of hot water and phosphite, and 1-MCP as post-harvest treatments for passion fruit (Passiflora edulis f. flavicarpa) reduces anthracnose and does not alter fruit quality

Dutra, Jaqueline Barbosa, Blum, Luiz Eduardo Bassay, Lopes, Leonardo Ferreira, Cruz, André Freire, Uesugi, Carlos Hidemi
Horticulture, environment and biotechnology 2018 v.59 no.6 pp. 847-856
1-methylcyclopropene, Glomerella cingulata, Passiflora edulis f. flavicarpa, anthracnose, brix, citric acid, disease severity, fruit quality, fruits, pH, passion fruits, phosphorus pentoxide, postharvest treatment, titratable acidity, total soluble solids, weight loss, zinc
This research aimed to evaluate the effectiveness of hot water (43–53 °C · 5 min⁻¹; 47 °C · 2–6 min⁻¹), 1-methylcyclopropene (1-MCP) at 50–300 nL L⁻¹ and a combination of hot water (47/49 °C · 5 min⁻¹) and phosphite (40% P₂O₅ + 20% K₂O; 40% P₂O₅ + 10% Zn) in anthracnose control and the effect on fruit quality [fresh weight loss (FWL—%); pH, total soluble solids (TSS—°Brix), and titratable acidity (TA = % citric acid (CA)] of passion fruit (Passiflora edulis f. flavicarpa) at the post-harvest stage. When the fruits were in the stage of 0% dehydration and fully yellow peels, they were disinfested and inoculated with Colletotrichum gloeosporioides. They were then subjected to the above mentioned treatments; this was followed by incubation for 120 h. The diameter of the disease lesions was monitored daily. After the incubation, a physico-chemical analysis was performed. Hot-water treatment resulted in disease reduction at 47 and 49 °C for 4 and 5 min. The combination of hot-water treatment at 47 °C (4 or 5 min) and application of the phosphite of K or Zn significantly reduced disease severity in fruits. The 1-MCP treatment reduced anthracnose severity in passion fruit mainly at 200 nL L⁻¹ · 24 h⁻¹. None of the treatments significantly changed the physico-chemical characteristics of the fruit [FWL (2.6–4.1%); pH (3.2–3.5), TSS (8.9–10.9 °Brix), and TA (1.8–2.5% CA)].