tailieunhanh - Báo cáo lâm nghiệp: " Rubisco activity and mitochondrial malate oxidation in pedunculate oak (Quercus robur L) seedlings grown under present and elevated atmospheric CO concentrations 2"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: " Rubisco activity and mitochondrial malate oxidation in pedunculate oak (Quercus robur L) seedlings grown under present and elevated atmospheric CO concentrations 2. | Ann Sci For 1996 53 469-474 Elsevier INRA 469 Original article Photosynthesis Rubisco activity and mitochondrial malate oxidation in pedunculate oak Quercus robur L seedlings grown under present and elevated atmospheric co2 concentrations V George D Gerant p Dizengremel Équipe d ecophysiologie cellulaire laboratoire de biologie forestiere associé Inra université Henri-Poincaré Nancy-1 BP 239 54506 Vandceuvre France Received 13 December 1994 accepted 14 December 1995 Summary Pedunculate oak seedlings were grown at 350 and 700 ụưL co2 in controlled chambers. After 130 days at elevated co2 the biomass of the whole plant did not significantly increase. Photosynthesis Rubisco activity mitochondrial malate oxidation carbohydrates and nitrogen contents were examined in the fourth growth flush. At 700 pL L co2 the leaf net photosynthetic rate was 220 higher than at 350 pưL co2. The decreased activity of Rubisco was accompanied by an accumulation of sucrose and glucose. The decreased oxidative capacity of crude leaf mitochondria from elevated co2 plants was driven by the lower nitrogen and protein contents rather than by the higher carbohydrates contents in the leaves. Nevertheless direct effects of elevated co2 on the respiratory biochemistry cannot be excluded. co2 Rubisco carbohydrates I mitochondria oak Resume Photosynthèse activité Rubisco et oxydation mitochondriale du malate Chez des semis de chêne pédonculé Quercus robur L élevés à des concentrations en co2 atmosphé-rique actuelle et double. Des germinations de chêne pédonculé ont été élevées sous 350 et 700 pUL de co2 en chambres de culture. Après 130 jours de co2 élevé la biomasse du plant entiern a pas augments significativement. Les échanges foliaires de co2 1 activite Rubisco I oxydation mitochondriale du malate les teneurs de sucres et d azote ont été étudiées sur des feuilles de la quatrième vague de croissance. À 700 pL L de co2 le taux de photosynthèse nette foliaire augments de 220 par rapport à celui à .