tailieunhanh - Báo cáo lâm nghiệp: "Starch and soluble carbohydrates in leaves of water-stressed oak saplings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Starch and soluble carbohydrates in leaves of water-stressed oak saplings. | Ann Sci For 1996 53 263-268 Elsevier INRA 263 Short note Starch and soluble carbohydrates in leaves of water-stressed oak saplings D Épron E Dreyer Écophysiologie forestiere Centre de Nancy Inra 54280 Champenoux France Received 6 September 1994 accepted 19 July 1995 Summary Four-year-old potted saplings of Quercus petraea Matt Liebl were exposed to water shortage by withholding irrigation. After 10 days predawn leaf water potential was decreased to MPa and leaf photosynthesis was reduced by 55 . At this stage starch and sucrose concentrations were decreased by 47 and 48 respectively. A five-fold increase was observed in glucose and fructose concentrations of water-stressed saplings compared with well-watered plants. These results suggested that drought-induced changes in sugar composition contribute to osmotic adjustment in this species. oak Quercus I soluble carbohydrate starch sucrose water stress Resume Amidon et glucides solubles dans les feuilles de jeunes plants de chêne soumis à un deficit hydrique. Des jeunes plants en pot de Quercus petraea Matt Liebl ãgés de 4 ans ont été soumis à un deficit hydrique en supprimant I irrigation. Après 10 jours le potential hydrique en fin de nuit était de -2 0 MPa et la photosynthèse foliaire réduite de 55 . À ce Stade les concentrations en amidon et en saccharose étaient diminuées de 47 et 48 respectivement. Les concentrations foliaires en glucose et en fructose des plants soumis à la sécheresse étalent augmentées d un facteur 5 par rapport aux plants bien irrigués. Ces résultats suggèrent que les changements de la composition glu-cidique des feuilles tors d un deficit hydrique contribuent à un ajustement osmotique Chez cette espèce. chêne Quercus deficit hydrique amidon saccharose glucide soluble Present address Institut des sciences et des techniques de I environnement pole universitaire du Pays de Montbéliard BP 427 25211 Montbéliard cedex France. 264 D Epron E Dreyer INTRODUCTION Sessile oak Quercus petraea is .

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