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Titolo:
Enzymatic regulation of photosynthetic and light- independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
Autore:
Cabello-Pasini, A; Alberte, RS;
Indirizzi:
Univ Autonoma Baja California, Inst Invest Oceanol, Ensenada 22800, Baja California, Mexico Univ Autonoma Baja California Ensenada Baja California Mexico 22800 exico
Titolo Testata:
Revista chilena de historia natural
fascicolo: 2, volume: 74, anno: 2001,
pagine: 229 - 236
SICI:
0716-078X(200106)74:2<229:EROPAL>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
LONGITUDINAL PROFILES; GROWTH; ALGAE;
Keywords:
enzymatic activity; chlorophyll; light-independent carbon fixation; photosynthesis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Cabello-Pasini, A Univ Autonoma Baja California, Inst Invest Oceanol, Apartado Postal 453, Ensenada 22800, Baja California, Mexico Univ Autonoma BajaCalifornia Apartado Postal 453 Ensenada Baja California Mexico 22800
Citazione:
A. Cabello-Pasini e R.S. Alberte, "Enzymatic regulation of photosynthetic and light- independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)", REV CHIL HN, 74(2), 2001, pp. 229-236

Abstract

Carbon is acquired through photosynthetic and non-photosynthetic processesin marine algae, However, little is known about the biochemical regulationof these metabolic pathways along the thallus of seaweeds. Consequently, the objective of this study was to assess the distribution of in vivo carboxylation pathways and to relate them to the in vitro activity of ribulose 1,5-bisphosphate carboxylase/oxygenase (RUBISCO), phosphoenolpyruvate carboxykinase (PEPCK), and phosphoenolpyruvate carboxylase (PEPC) in the Phaeophyte Laminaria setchellii, the Chlorophyte Ulva lactuca, and the Rhodophyte Iridaea cordata. Chlorophyll-a levels did not vary in U. lactuca and I. cordata. However, pigment levels were significantly lower in the meristematic region of L. setchellii probably as a result of a lack of differentiation of the chloroplasts in this region. Similarly, net photosynthesis did not varyin the thallus of U. lactuca and L cordata. while it increased from the stipe and meristem towards the lamina of L. setchellii. In contrast to photosynthesis, light-independent carbon fixation rates were significantly greater in the meristematic region of L. setchellii suggesting a compensating mechanism for carbon incorporation in photosynthetically limited tissue. The activity of RUBISCO and PEPCK followed a pattern similar to that of in vivo carboxylation processes indicating that in vivo carbon assimilation is regulated by the activity of the carboxylating enzymes throughout the thallus of L. setchellii.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 19:54:36