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Induction of a crassulacean acid-like metabolism in the C4 succulent plant, Portulaca oleracea L.: Study of enzymes involved in carbon fixation and carbohydrate metabolism

Lara, M.V. (Universidad Nacional de Rosario (Argentina)) ; Drincovich, M.F ; Andreo, C.S

Plant and cell physiology, 2004-05, Vol.45 (5), p.618-626 [Peer Reviewed Journal]

Oxford: Oxford University Press

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Title:
Induction of a crassulacean acid-like metabolism in the C4 succulent plant, Portulaca oleracea L.: Study of enzymes involved in carbon fixation and carbohydrate metabolism
Author: Lara, M.V. (Universidad Nacional de Rosario (Argentina)) ; Drincovich, M.F ; Andreo, C.S
Subjects: ATP-dependent phosphofructokinase ; BSC ; bundle sheath cell ; C4 PLANTS ; CAM ; CAM PATHWAY ; crassulacean acid metabolism ; DROUGHT STRESS ; G3PDH ; G6PDH ; GAPDHnP ; glucose-6-phosphate dehydrogenase ; glycerol-3-phosphate dehydrogenase ; Keywords: C4 metabolism — Crassulacean acid metabolism — Drought stress — NAD-malic enzyme — Phosphoenolpyruvate carboxylase — Portulaca oleracea ; MALIC ENZYME ; mesophyll cell ; NAD-malate dehydrogenase ; NAD-malic enzyme ; NAD-MDH ; NAD-ME ; NADP-malate dehydrogenase ; NADP-malic enzyme ; NADP-MDH ; NADP-ME ; nonphosphorylating glyceraldehyde-3-P dehydrogenase ; PEPC ; PEPCK ; PFK ; PFP ; phosphoenolpyruvate carboxykinase ; PHOSPHOENOLPYRUVATE CARBOXYLASE ; PHOTOSYNTHESIS ; PORTULACA OLERACEA ; PPDK ; PPi-dependent phosphofructokinase ; pyruvate orthophosphate dikinase ; ribulose biphosphate carboxylase-oxygenase ; RuBisCO ; TPI ; triosephosphateisomerase ; water storage cell ; WSC
Is Part Of: Plant and cell physiology, 2004-05, Vol.45 (5), p.618-626
Notes: F61
2005001464
istex:4F8508421FEA966A79DCFCEB0B27BE16731174AE
local:pch073
Received December 29, 2003; Accepted March 2, 2004
ark:/67375/HXZ-BZCC2HQT-9
Description: The C4 succulent plant Portulaca oleracea shifts its photosynthetic metabolism to crassulacean acid metabolism (CAM) after 23 d of withholding water. This is accounted by diurnal acid fluctuation, net nocturnal but not day CO2 uptake and drastic changes in phosphoenolpyruvate carboxylase (PEPC) kinetic and regulatory properties [Lara et al. (2003) Photosynth. Res. 77: 241]. The goal of the present work was to characterize the CAM activity in leaves of P. oleracea during water stress through the study of enzymes involved in carbon fixation and carbohydrate metabolism. After drought stress, a general decrease in the photosynthetic metabolism, as accounted by the decrease in the net CO2 fixation and in the activity of enzymes such as ribulose-1,5-bisphosphate carboxylase/oxygenase, PEPC, pyruvate orthophosphate dikinase, phosphoenolpyruvate carboxykinase and NAD-malic enzyme was observed. We also found changes in the day/night activities and level of immunoreactive protein of some of these enzymes which were correlated to night CO2 fixation, as occurs under CAM metabolism. Based on the results obtained, including those from in situ immunolocalization studies, we propose a scheme for the possible CO2 fixation pathways used by P. oleracea under conditions of sufficient and limiting water supply.
Publisher: Oxford: Oxford University Press
Language: English

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Induction of a crassulacean acid-like metabolism in the C4 succulent plant, Portulaca oleracea L.: Study of enzymes involved in carbon fixation and carbohydrate metabolism

Lara, M.V. (Universidad Nacional de Rosario (Argentina)) ; Drincovich, M.F ; Andreo, C.S

Oxford: Oxford University Press

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