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Piégeurs d'oxygène actif pendant l'acclimatation au froid de graines de pin sylvestre en rapport avec la tolérance à la congélation.

Active oxygen scavengers during cold acclimation of Scots pine seedlings in relation to freezing tolerance.

Auteurs : TAO D. L., ÖQUIST G., WINGSLE G.

Type d'article : Article

Résumé

Freezing injury of plants may be caused by the deleterious reactions of active oxygen species, and free-radical scavenging systems may be important in the allevation of freezing stress. To test the feasibility of this hypothesis, enzymes and metabolites that cooperatively scavenge oxygen ions and hydrogen peroxide were analyzed in Scots pine (Pinus sylvestris L.) seedlings during a stepwise cold acclimation procedure. Elevated levels of enzymatic scavengers such as ascorbate peroxidase, glutathione reductase, monodehydroascorbate reductase, and dehydroascorbate reductase were found, along with increased freezing tolerance during cold acclimation, supporting the hypothesis. Induction of the scavenging system during acclimation is discussed in relation to freezing tolerance.

Détails

  • Titre original : Active oxygen scavengers during cold acclimation of Scots pine seedlings in relation to freezing tolerance.
  • Identifiant de la fiche : 1999-3918
  • Langues : Anglais
  • Source : Cryobiology - vol. 37 - n. 1
  • Date d'édition : 08/1998

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