Unravelling the mechanisms that improve photosynthetic performance of N₂-fixing pea plants exposed to elevated [CO₂]
Fecha
2014Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
|
10.1016/j.envexpbot.2013.10.020
Resumen
Although the predicted enhanced photosynthetic rates of plants exposed to elevated [CO₂] are expected to increase carbohydrate and plant growth, recent findings have shown a complex regulation of these
processes. The aim of this study was to determine the effect of elevated [CO₂] on pathways leading to the main forms of leaf C storage (starch) and export (sucrose) and the implications of this in ...
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Although the predicted enhanced photosynthetic rates of plants exposed to elevated [CO₂] are expected to increase carbohydrate and plant growth, recent findings have shown a complex regulation of these
processes. The aim of this study was to determine the effect of elevated [CO₂] on pathways leading to the main forms of leaf C storage (starch) and export (sucrose) and the implications of this increased
[CO₂] on photosynthetic performance of exclusively N2 fixing plants. For this purpose, exclusively N2-fixing pea plants were exposed to elevated [CO₂] (1000 mol mol−1 versus 360 mol mol−1 CO₂). The data
obtained highlighted that plants exposed to elevated [CO₂] were capable of maintaining hexose levels (involved in Rubisco down regulation) at control levels with the consequent avoidance of photosynthetic
acclimation. More specifically, in plants exposed to elevated [CO₂] there was an increase in the activity of pathways involved in the main forms of leaf C storage (starch) and export (sucrose). Furthermore, the
study highlighted that although starch content increased by up to 40% under elevated [CO₂], there was also an increase in the proteins and compounds involved in starch degradation. Such a finding, together with
an increase in the activity of proteins involved in sucrose synthesis revealed that these plants up-regulated the sucrose synthesis pathway in order to meet the large nodule photoassimilate requirements. As a
consequence, the study highlighted the relevance of controlling the activity of pathways that determine leaf cellular carbohydrate availability and how this is linked with C-demanding organs such as nodules. [--]
Materias
Elevated [CO₂],
Nodule,
Pea,
Photoassimilates,
Starch,
Sucrose
Editor
Elsevier
Publicado en
Environmental and Experimental Botany, 2014, 99, 167-174
Departamento
Universidad Pública de Navarra. Departamento de Ciencias del Medio Natural /
Nafarroako Unibertsitate Publikoa. Natura Ingurunearen Zientziak Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. IdAB. Instituto de Agrobiotecnología / Agrobioteknologiako Institutua
Versión del editor
Entidades Financiadoras
This work has been funded by the Spanish National Research and Development Programme (AGL2011-30386-CO2-1 and AGL2011-30386-CO2-2). Iker Aranjuelo was the recipient of a Ramón y Cajal
research grant (Ministerio de Economía y Competitividad).