Partager

Influences des revêtements exogènes sur les maladies dues au froid et la qualité après récolte du pamplemousse blanc "Marsh".

Exogenous coating influences on chilling injury and postharvest quality of white 'Marsh' grapefruit.

Auteurs : DOU H., BROWN G. E., JONES S., et al.

Résumé

The effect of exogenous squalene coating on the reduction of grapefruit chilling injury (CI) and maintenance of fresh fruit quality was studied in the 1998/2002 seasons. In the first study, fruits were dipped with thiabendazole and imazalil and coated 6 hours later with different mixtures of a squalene emulsion and wax micro-emulsions (carnauba, or polyethylene). After 4 °C storage for 16 weeks the CI was 21% for squalene-treated fruits, which was significantly higher than the 4-7% of CI found for all other treatments (control, wax alone or wax + squalene). Even at 10 °C storage there was 4% CI in fruits treated with squalene, compared with about zero for all other treatments. Decay was close to zero after 16 weeks of storage at 4 °C for all the treatments. After two additional weeks at 23 °C decay was 5% in non-waxed and about 2% in waxed fruits. Fruits were also treated with other chemicals in the squalene emission to determine if these caused CI. After 10 weeks of storage at 4 °C, treatments with squalene emulsion resulted in significant CI damage, and after 18 weeks of storage the complete squalene emulsion gave the highest incidence of CI. In the final study, white grapefruit treated with combinations of squalene emulsion or squalene in water, applied with or without carnauba wax were examined for CI, decay, peel gloss and weight loss. Non-waxed fruits had the highest rate of CI. Waxed fruits treated with squalene in water had the lowest rate of CI after 3 months. Decay was generally lower than CI damage in all the experiments. Inconsistent results were found in fruit weight loss, internal gases, and fruit shine after exogenous squalene coating. the CI symptoms in fruits treated with squalene emulsion resembled that of a phytotoxic peel damage.

Détails

  • Titre original : Exogenous coating influences on chilling injury and postharvest quality of white 'Marsh' grapefruit.
  • Identifiant de la fiche : 2005-0220
  • Langues : Anglais
  • Date d'édition : 2003
  • Source : Source : Acta Hortic./Proc. int. hortic. Congr., Toronto
    n. 628; vol. 1; 333-341; 17 ref.

Indexation