Cell wall degrading enzymes activity is altered by high carbon dioxide treatment in postharvest ‘Mihong’ peach fruit

Autor: Eun-Ha Chang, Ji-Gang Kim, Jin-Su Lee
Rok vydání: 2017
Předmět:
Zdroj: Scientia Horticulturae. 225:399-407
ISSN: 0304-4238
DOI: 10.1016/j.scienta.2017.07.038
Popis: Peach fruits are ripen rapidly after harvest, especially at room temperature. It is difficult to handle because they are scars easily and easy to decay. It is generally acknowledged that modified atmospheres with elevated CO 2 inhibits fruit ripening by reduces ethylene biosynthesis. This study was to investigate the affect of high concentration CO 2 treatment on ethylene biosynthesis, ACO and softening-related enzymatic activity. Peaches were treated with high CO 2 (90 pKa) at the time of sealing in the plastic chambers and then the chambers were ventilated after 3 and 12 h. Fruits treated with 90 kPa CO 2 for 3 or 12 h exhibited a significant delay in firmness when compared to control fruits. In addition to fruit softening inhibition, the decay rate was also inhibited by CO 2 treatment. Four days after storage at room temperature, CO 2 untreated peaches had decay rate of 14%, whereas the decay rate was 6% and 3.5% in fruits treated with 90 kPa CO 2 for 3 and 12 h. The ACO was inhibited by CO 2 and the inhibition was enhanced with higher CO 2 exposure time. Also High CO 2 treatment inhibited the activities of softening-related enzyme such as PG, β-Galactosidase, PEL promoted by ethylene biosynthesis in peaches. These results indicate that increasing levels of CO 2 inhibit ethylene biosynthesis by reducing the ACO activity of peach fruits. Results suggest that the effect of CO 2 on ethylene production in ‘Mihong’ peach fruit depended on exposure time and CO 2 level. Also a short-term treatment with a high concentration of CO 2 may be used to reduce ethylene biosynthesis, which may be induced after postharvest of fruit.
Databáze: OpenAIRE
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