Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)

Carbon is acquired through photosynthetic and non-photosynthetic processes in marine algae. However, little is known about the biochemical regulation of these metabolic pathways along the thallus of seaweeds. Consequently, the objective of this study was to assess the distribution of in vivo carboxy...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	CABELLO-PASINI,ALEJANDRO, ALBERTE,RANDALL S.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2001
Materias:	enzymatic activity chlorophyll light-independent carbon fixation photosynthesis
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200002
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0716-078X2001000200002
record_format	dspace
spelling	oai:scielo:S0716-078X20010002000022001-11-08Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)CABELLO-PASINI,ALEJANDROALBERTE,RANDALL S. enzymatic activity chlorophyll light-independent carbon fixation photosynthesis Carbon is acquired through photosynthetic and non-photosynthetic processes in marine algae. However, little is known about the biochemical regulation of 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 vary in the thallus of U. lactuca and I. 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. setchelliiinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.74 n.2 20012001-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200002en10.4067/S0716-078X2001000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	enzymatic activity chlorophyll light-independent carbon fixation photosynthesis
spellingShingle	enzymatic activity chlorophyll light-independent carbon fixation photosynthesis CABELLO-PASINI,ALEJANDRO ALBERTE,RANDALL S. Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
description	Carbon is acquired through photosynthetic and non-photosynthetic processes in marine algae. However, little is known about the biochemical regulation of 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 vary in the thallus of U. lactuca and I. 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
author	CABELLO-PASINI,ALEJANDRO ALBERTE,RANDALL S.
author_facet	CABELLO-PASINI,ALEJANDRO ALBERTE,RANDALL S.
author_sort	CABELLO-PASINI,ALEJANDRO
title	Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
title_short	Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
title_full	Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
title_fullStr	Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
title_full_unstemmed	Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
title_sort	enzymatic regulation of photosynthetic and light-independent carbon fixation in laminaria setchellii (phaeophyta), ulva lactuca (chlorophyta) and iridaea cordata (rhodophyta)
publisher	Sociedad de Biología de Chile
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200002
work_keys_str_mv	AT cabellopasinialejandro enzymaticregulationofphotosyntheticandlightindependentcarbonfixationinlaminariasetchelliiphaeophytaulvalactucachlorophytaandiridaeacordatarhodophyta AT alberterandalls enzymaticregulationofphotosyntheticandlightindependentcarbonfixationinlaminariasetchelliiphaeophytaulvalactucachlorophytaandiridaeacordatarhodophyta
_version_	1718439503557820416

Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)

Ejemplares similares