title: Two distinct plant respiratory physiotypes might exist which correspond to fast-growing and slow-growing species.
abstract: The origin of the carbon atoms in CO2 respired by leaves in the dark of several plant species has been studied using 13C/12C stable isotopes. This study was conducted using an open gas exchange system for isotope labeling that was coupled to an elemental analyzer and further linked to an isotope ratio mass spectrometer (EA-IRMS) or coupled to a gas chromatography-combustion-isotope ratio mass spectrometer (GC-C-IRMS). We demonstrate here that the carbon, which is recently assimilated during photosynthesis, accounts for nearly ca. 50% of the carbon in the CO2 lost through dark respiration (Rd) after illumination in fast-growing and cultivated plants and trees and, accounts for only ca. 10% in slow-growing plants. Moreover, our study shows that fast-growing plants, which had the largest percentages of newly fixed carbon of leaf-respired CO2, were also those with the largest shoot/root ratios, whereas slow-growing plants showed the lowest shoot/root values.
authors: Unitat de Fisiologia Vegetal, Departament de Biologia Vegetal, Universitat de Barcelona, E-08028 Barcelona, Spain. Electronic address: salvador.nogues@ub.edu.
authors: Salvador
authors: S
authors: Nogués
authors: Unitat de Fisiologia Vegetal, Departament de Biologia Vegetal, Universitat de Barcelona, E-08028 Barcelona, Spain.
authors: Salvador
authors: S
authors: Aljazairi
authors: Unitat de Fisiologia Vegetal, Departament de Biologia Vegetal, Universitat de Barcelona, E-08028 Barcelona, Spain.
authors: Claudia
authors: C
authors: Arias
authors: Unitat de Fisiologia Vegetal, Departament de Biologia Vegetal, Universitat de Barcelona, E-08028 Barcelona, Spain.
authors: Elena
authors: E
authors: Sánchez
authors: Unitat de Fisiologia Vegetal, Departament de Biologia Vegetal, Universitat de Barcelona, E-08028 Barcelona, Spain.
authors: Iker
authors: I
authors: Aranjuelo
mesh_terms: D028023:Arecaceae / Q000254:growth & development / Q000502:physiology*; D018533:Biomass; D002244:Carbon / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism*; D002247:Carbon Isotopes / Q000032:analysis; D019069:Cell Respiration; D029784:Cycas / Q000254:growth & development / Q000502:physiology*; D003624:Darkness; D008401:Gas Chromatography-Mass Spectrometry; D008027:Light; D010788:Photosynthesis; D018515:Plant Leaves / Q000254:growth & development / Q000502:physiology; D018517:Plant Roots / Q000254:growth & development / Q000502:physiology; D018520:Plant Shoots / Q000254:growth & development / Q000502:physiology; D018526:Plant Transpiration / Q000502:physiology*; D031947:Ranunculus / Q000254:growth & development / Q000502:physiology*; D014197:Trees
chemical_list: D002247:Carbon Isotopes; D002245:Carbon Dioxide; D002244:Carbon
keywords: Carbon stable isotopes; Fast- and slow-growing plants; Photosynthesis; Respiration