Effect of high CO2 level on the titres of gamma -aminobutyric acid, total polyamines and some pathogenesis-related proteins in cherimoya fruit stored at low temperature.
Merodio, C.; Munoz, M. T.; Cura, B. del; Buitrago, D.; Escribano, M. I.;
Journal of Experimental Botany Year: 1998 Vol: 49 Issue: 325 Pages: 1339-1347 Ref: 42 ref.
1998
บทคัดย่อ
The effects of treatment with 20% CO2 plus 20% O2 for 3 days on gamma -aminobutyric acid (GABA), total polyamine titres and the production of some pathogenesis-related proteins (PR-proteins) in cherimoya (Annona cherimola) fruit stored at low temperature were determined. In immunoassays with anti-PR-Q and PR-2 protein sera, high CO2 levels were found to provoke the co-ordinated accumulation of a chitinase-like protein and 1,3- beta -glucanase. Chitinase activity was higher in treated than in untreated fruit. At the end of CO2 treatment, total polyamine and gamma -aminobutyric acid content and uptake of O2 were higher in treated compared to untreated fruit, but the accumulation of these compounds decreased when the fruit was transferred to air. Since this treatment effectively retains the fruit quality, high CO2 levels may have a direct effect on the activation of the above-mentioned specific responses that enables cherimoya fruit to overcome chilling temperature. The relationship between the act
ivation of the defence system and the capacity to regulate cytoplasmic pH in CO2-treated fruits is discussed.