บทคัดย่องานวิจัย

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Chilling-induced changes in phenylalanine ammonia-lyase, peroxidase, and polyphenol oxidase activities in citrus flavedo tissue.

Martinez-Tellez, M. A.; Lafuente, M. T.;

Acta Horticulturae Year: 1993 Issue: No. 343 Pages: 257-263 Ref: 15 ref.

1993

บทคัดย่อ

Chilling-induced changes in phenylalanine ammonia-lyase, peroxidase, and polyphenol oxidase activities in citrus flavedo tissue.

Fortune mandarins were harvested and held for 25 days at 2 chilling temperatures (2.5 and 5 deg C) and at a non-chilling temperature (10 deg ). Navelina oranges were held for 60 days at 1.0, 2.5 or 10 deg . All samples were stored at 85-90% RH. Fruits were visually assessed for chilling injury (surface necrosis and browning intensity) and tissues were analysed for enzymic activity. Chilling symptoms were detected in Fortune mandarins after 8 days' storage at 2.5 or 5 deg . After 14 days, 72% of fruits held at 2.5 deg and 62% of fruits held at 5 deg showed chilling symptoms. Chilling symptoms were not observed in Navelina oranges held at 1.0 or 2.5 deg for 60 days. No correlation was found between the development of chilling symptoms and the changes in polyphenol oxidase and peroxidase activities in both species. The susceptibility of mandarins to chilling injury paralleled its capacity for the activation of phenylalanine ammonia-lyase in response to low temperature.