Sélection de la langue

Gouvernement du Canada / Government of Canada

Recherche

Evidence for the occurrence of photorespiration in synurophyte algae

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1007/s11120-011-9639-z
AuteurRechercher : ; Rechercher :
FormatTexte, Article
SujetCarbon concentrating mechanism; Chrysophyte; Mallomonas; Mass spectrometry; Photorespiration; Photosynthesis; Synura; Tessellaria
Résumé
The fluxes of CO 2 and oxygen during photosynthesis by cell suspensions of Tessellaria volvocina and Mallomonas papillosa were monitored mass spectrometrically. There was no rapid uptake of CO 2, only a slow drawdown to compensation concentrations of 26 lM for T. volvocina and 18 lM for M. papillosa, when O 2 evolution ceased, indicating a lack of active bicarbonate uptake by the cells. Darkening of the cells after a period of photosynthesis did not cause rapid release of CO 2, indicating the absence of an intracellular inorganic carbon pool. However, upon darkening a brief burst of CO 2 was observed similar to the post-illumination burst characteristic of C3 higher plants. Treatment of the cells of both species with the membrane-permeable carbonic anhydrase inhibitor ethoxyzolamide had no adverse effect on photosynthetic rate, but stimulated the dark CO 2 burst indicating the dark oxidation of a compound formed in the light. In the absence of any active accumulation of inorganic carbon photosynthesis in these species should be inhibited by O 2. This was investigated in four synurophyte species T. volvocina, M. papillosa, Synura petersenii, and Synura uvella: Photosynthetic O 2 evolution rates in all four algae, measured by O 2 electrode, were significantly higher (40-50%) in media at low O 2 (4%) than in airequilibrated (21% O 2) media, indicating an O 2 inhibition of photosynthesis (Warburg effect) and thus the occurrence of photorespiration in these species. © Springer Science+Business Media B.V. 2011.
Date de publication
Dans
  • Photosynthesis Research 109, nº 1-3 (26 mars 2011) : 251–256.
Langueanglais
Publications évaluées par des pairsOui
Publication du CNRC
Cette publication n’est pas du CNRC

Ce sont des publications qui ont été rédigées par un auteur du CNRC, mais avant que celui-ci soit employé du CNRC.

Numéro NPARC19709133
Exporter la noticeExporter en format RIS
Signaler une correctionSignaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement8149335f-04ee-4887-8248-717683f55289
Enregistrement créé2012-04-02
Enregistrement modifié2020-04-21
Date de modification :