Combination of Irradiation and Sodium Carbonate to Control Postharvest Penicillium Decay of Apples

Year 2013, Volume: 42 Issue: 1-2-3, 47 - 56, 28.05.2014

Cemile Temur , Osman Tiryaki

Abstract

Penicillium expansum is an important pathogen causing
considerable postharvest losses in apples. Due to some restrictions applied for
chemicals, there is a need for new approaches and combined treatments for inhibition
of fungi. In present study, O2 isolate of P. expansum, isolated from apples in cold storages of
Kayseri, was used. Inoculated apples were irradiated with 3.0, 3.5 and 4.0 kGy and stored at 3-4ºC
for 40 days. While the lesion diameter of untreated apples at 40^th
day was 20.28 mm, the apples treated with 3.5 kGy had a diameter of 7.85 mm. Differences
in lession diamaters were found to be significant (p<0.05).In second part of study, inoculated
apples were treated with sodium carbonate (SC,%3)+2.5 kGy, SC+3.0 kGy and
SC+3.5 kGy combinations and stored at 3-4ºC for 40 days. At the 40^th
day, lesion diameters were measured as 49.00 mm and 19.18 mm for control
samples and SC+3.0 kGy treatment, respectively. The area under the disease
progress curve (AUDPC) was evaluated to calculate individual and total AUDPC.Long-term impacts of treatments on P.expansum were also evaluated by
performing re-isolation from untreated and SC+3.0 kGy treatments. There
were no significant diffrerences between control and treated ones with regard
tocultural characteristics and pathogenicity of
fungus.

Keywords

Postharvest disease, Penicillium expansum, Irradiation, Combined treatment

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