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Accumulation des solutés dans les plantules de blé lors de l'acclimatation au froid : contribution à la tolérance accrue vis-à-vis de la congélation.

Solute accumulation in wheat seedlings during cold acclimation: contribution to increased freezing tolerance.

Auteurs : KAMATA T., UEMURA M.

Type d'article : Article

Résumé

Accumulation of sugars, amino acids and glycinebetaine in leaf tissues during cold acclimation was monitored and compared in three wheat cultivars that have different freezing tolerance. During cold acclimation, there was a significant increase in osmotic concentration in the three cultivars. The increase was largely due to the increase in soluble sugars and the extent of the increase was the greatest in Norstar and the least in Haruyutaka. A considerable increase in glucose, fructose and sucrose occurred during the first week of cold acclimation, but the increase in raffinose occurred only after the second week. Proline increased in all cultivars after 1 week of cold acclimation but a prolonged cold acclimation resulted in different profiles. In all three cultivars, a noticeable increase of glycinebetaine occurred only after the second week of cold acclimation. It is concluded that a substantial part of the increase in osmotic concentration during cold acclimation was due to the increase in sugars, but the extent of the contribution of each compatible solute is cultivar-specific.

Détails

  • Titre original : Solute accumulation in wheat seedlings during cold acclimation: contribution to increased freezing tolerance.
  • Identifiant de la fiche : 2005-1338
  • Langues : Anglais
  • Source : CryoLetters - vol. 25 - n. 5
  • Date d'édition : 09/2004

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