Influence of ripening on the ethylene and carbon dioxide production during storage of plum fruits
2012
Koziskova, J., Mendelova Univ., Lednice (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu | Golias, J., Mendelova Univ., Lednice (Czech Republic). Ustav Poskliznove Technologie Zahradnickych Produktu
The fruits of 13 plum cultivars were analysed at two different stages of maturity: first when they were ready for picking according to conventional commercial criteria, and again after seven days of maturation at 20 deg C in a normal oxygen atmosphere during shelf life. Firmness, soluble solids concentration (SSC), respiration rate and the production of ethylene were measured. In the period of over-ripening SSC increased and no differences were found in relation to the cultivar. The fruits in this period were physiologically in a phase of reduced intensity of respiration, while production of ethylene increased and was associated with the earliness of the cultivar. Cultivars with a short vegetation period produced more ethylene while late-maturing cultivars had a low potential for ethylene production. Based on post-harvest changes in the tested quality factors, the late-ripening plum cultivars Jojo, Topend, President, Tophit and Elena had higher storage potential. Changes in ethylene production in response to shelf life seem to play a regulatory role in fruit firmness. A high significant negative correlation was detected between levels of skin firmness and ethylene production.
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