Promising technology to control bitter pit and other postharvest pathologic diseases

V.A. Gudkovskii, L.V. Kozhina, A.E. Balakirev, Y.B. Nazarov, A.I. Kuzin
This research was conducted in 2015-2018 using apple fruit ‘Sinap Orlovskii’ in the experimental apple orchard of the I.V. Michurin Federal Research Centre (Tambov region, Russia). This cultivar has high susceptibility to bitter pit and average susceptibility to scald, and CO2 injury, The primary postharvest strategy to protect fruits against bitter pit (BP) is controlled atmosphere (CA) storage. A short-term exposure to decreased levels of oxygen (10 days, O2 conc. <1.0%) reduces losses from scald and BP but does not provide protection to highly susceptible cultivars. Postharvest treatment with an ethylene inhibitor (1-MCP) provides protection from scald but can increase the occurrence of BP. The objective of our research is to the development of innovative technology for controlling bitter pit and postharvest diseases. 1-MCP untreated and treated apple fruits were stored at 0…+1°C in normal atmosphere (RA) and controlled atmosphere: CA-1 (CO2 – 1.2-1.5%, O2 – 1.2-1.5%), CA-2 (CO2<0.1%, O2 – 1.2-1.5%), LO2+RA (within 10 days immediately after harvest fruits were stored at the temperature +18…+20°C, CO2<0.1%, O2 – 1.2-1.5%) and in normal atmosphere. Levels of ethylene, α-farnesene, and its oxidation products (CT281), and phenolic compounds were determined in fruits over the course of the experiment. Losses from bitter pit, scald, CO2 injury were also determined, as well as fruit firmness. Treatment with 1-MCP resulted in low level of ethylene and CT281 accumulation in fruits of all the treatments, protection against scald, and preservation of fruit firmness. Maximum effects occurred in the CA-1, CA-2 and LO2+RA treatments. CA-2 provided the best protection against BP, while a significant decrease in BP was also noted in the LO2+RA treatment. The CA-2 treatment also prevented CO2 injury, which was observed in the CA-1 treatment. Maximum protection against BP, scald and CO2 injury was provided by the CA-2 treatment.
Gudkovskii, V.A., Kozhina, L.V., Balakirev, A.E., Nazarov, Y.B. and Kuzin, A.I. (2021). Promising technology to control bitter pit and other postharvest pathologic diseases. Acta Hortic. 1325, 151-158
DOI: 10.17660/ActaHortic.2021.1325.23
apple fruits, bitter pit, scald, 1-MCP, controlled atmosphere, normal atmosphere, ethylene, α-farnesene and its oxidation products, fruit firmness

Acta Horticulturae