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Modifications saisonnières dans le comportement lors de la congélation des cellules parenchymateuses du rayon xylémateux de quatre espèces boréales d'arbres feuillus.

Seasonal changes in the freezing behaviour of xylem ray parenchyma cells in four boreal hardwood species.

Auteurs : KURODA K., OHTANI J., KUBOTA M., FUJIKAWA S.

Type d'article : Article

Résumé

The freezing behavior of xylem ray parenchyma cells in several boreal hardwood species, namely, Betula platyphylla, Populus canadensis, P. sieboldii, and Salix sachalinensis, was examined by differential thermal analysis (DTA), cryoscanning electron microscopy (Cryo-SEM), and freeze-fracture replica electron microscopy. Although DTA profiles of samples harvested in summer and in winter suggested that the xylem ray parenchyma cells in four species responded to freezing stress by extracellular freezing, Cryo-SEM showed clearly that the xylem ray parenchyma cells in all these species responded to freezing stress by shallow supercooling in summer and by extracellular freezing in winter.

Détails

  • Titre original : Seasonal changes in the freezing behaviour of xylem ray parenchyma cells in four boreal hardwood species.
  • Identifiant de la fiche : 2000-0440
  • Langues : Anglais
  • Source : Cryobiology - vol. 38 - n. 1
  • Date d'édition : 01/1999

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