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Pea plant responsiveness under elevated [CO2] is conditioned by the N source (N2 fixation versus NO3 - fertilization)

AuthorsAranjuelo, Iker ; Cabrerizo, Pablo M.; Arrese-Igor, César; Aparicio-Tejo, Pedro María
Issue Date26-Jul-2013
CitationEnvironmental and Experimental Botany 95: 34-40 (2013)
AbstractThe main goal of this study was to test the effect of [CO2] on C and N management in different plant organs (shoots, roots and nodules) and its implication in the responsiveness of exclusively N2-fixing and NO3 --fed plants. For this purpose, exclusively N2-fixing and NO3 --fed (10mM) pea (Pisum sativum L.) plants were exposed to elevated [CO2] (1000μmolmol-1 versus 360μmolmol-1 CO2). Gas exchange analyses, together with carbohydrate, nitrogen, total soluble proteins and amino acids were determined in leaves, roots and nodules. The data obtained revealed that although exposure to elevated [CO2] increased total dry mass (DM) in both N treatments, photosynthetic activity was down-regulated in NO3 --fed plants, whereas N2-fixing plants were capable of maintaining enhanced photosynthetic rates under elevated [CO2]. In the case of N2-fixing plants, the enhanced C sink strength of nodules enabled the avoidance of harmful leaf carbohydrate build up. On the other hand, in NO3 --fed plants, elevated [CO2] caused a large increase in sucrose and starch. The increase in root DM did not contribute to stimulation of C sinks in these plants. Although N2 fixation matched plant N requirements with the consequent increase in photosynthetic rates, in NO3 --fed plants, exposure to elevated [CO2] negatively affected N assimilation with the consequent photosynthetic down-regulation. © 2013 Elsevier B.V.
Identifiersdoi: 10.1016/j.envexpbot.2013.06.002
issn: 0098-8472
Appears in Collections:(IDAB) Artículos
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