Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat

Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat

31 páginas, 4 tablas. -- The definitive version is available at http://www.elsevier.com

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Main Authors: Gutiérrez del Pozo, Diego, Morcuende, Rosa, Pozo, Alejandro del, Martínez-Carrasco, Rafael, Pérez Pérez, Pilar
Format: artículo biblioteca
Language:English
Published: Elsevier
Subjects:Cytokinin, Elevated CO2, Nitrogen, Photosynthetic acclimation, Wheat,
Online Access:http://hdl.handle.net/10261/78335
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spelling dig-irnasa-es-10261-783352022-06-01T13:10:17Z Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat Gutiérrez del Pozo, Diego Morcuende, Rosa Pozo, Alejandro del Martínez-Carrasco, Rafael Pérez Pérez, Pilar Cytokinin Elevated CO2 Nitrogen Photosynthetic acclimation Wheat 31 páginas, 4 tablas. -- The definitive version is available at http://www.elsevier.com Acclimation of photosynthetic capacity to elevated CO2 involves a decrease of the leaf Rubisco content. In the present study, it was hypothesized that nitrogen uptake and partitioning within the leaf and among different aboveground organs affects the down-regulation of Rubisco. Given the interdependence of nitrogen and cytokinin signals at the whole plant level, it is also proposed that cytokinins affect the nitrogen economy of plants under elevated CO2, and therefore the acclimatory responses. Spring wheat received varying levels of nitrogen and cytokinin in field chambers with ambient (370 μmol mol−1) or elevated (700 μmol mol−1) atmospheric CO2. Gas exchange, Rubisco, soluble protein and nitrogen contents were determined in the top three leaves in the canopy, together with total nitrogen contents per shoot. Growth in elevated CO2 induced decreases in photosynthetic capacity only when nitrogen supply was low. However, the leaf contents of Rubisco, soluble protein and total nitrogen on an area basis declined in elevated CO2 regardless of nitrogen supply. Total nitrogen in the shoot was no lower in elevated than ambient CO2, but the fraction of this nitrogen located in flag and penultimate leaves was lower in elevated CO2. Decreased Rubisco: chlorophyll ratios accompanied losses of leaf Rubisco with CO2 enrichment. Cytokinin applications increased nitrogen content in all leaves and nitrogen allocation to senescing leaves, but decreased Rubisco contents in flag leaves at anthesis and in all leaves 20 days later, together with the amount of Rubisco relative to soluble protein in all leaves at both growth stages. The results suggest that down regulation of Rubisco in leaves at elevated CO2 is linked with decreased allocation of nitrogen to the younger leaves and that cytokinins cause a fractional decrease of Rubisco and therefore do not alleviate acclimation to elevated CO2. D.G. was the recipient of a Junta de Castilla y León fellowship. The Spanish National Research and Development Programme – European Regional Development Fund ERDF (Projects BFI2003-01277 and AGL2006-13541-C02-02/AGR) have funded this work. Peer reviewed 2013-06-07 artículo http://purl.org/coar/resource_type/c_6501 Journal of Planta Physiology 170(15): 1337–1343 (2013) 0176-1617 http://hdl.handle.net/10261/78335 10.1016/j.jplph.2013.05.006 en http://dx.doi.org/10.1016/j.jplph.2013.05.006 open Elsevier
institution IRNASA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-irnasa-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IRNASA España
language English
topic Cytokinin
Elevated CO2
Nitrogen
Photosynthetic acclimation
Wheat
Cytokinin
Elevated CO2
Nitrogen
Photosynthetic acclimation
Wheat
spellingShingle Cytokinin
Elevated CO2
Nitrogen
Photosynthetic acclimation
Wheat
Cytokinin
Elevated CO2
Nitrogen
Photosynthetic acclimation
Wheat
Gutiérrez del Pozo, Diego
Morcuende, Rosa
Pozo, Alejandro del
Martínez-Carrasco, Rafael
Pérez Pérez, Pilar
Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
description 31 páginas, 4 tablas. -- The definitive version is available at http://www.elsevier.com
format artículo
topic_facet Cytokinin
Elevated CO2
Nitrogen
Photosynthetic acclimation
Wheat
author Gutiérrez del Pozo, Diego
Morcuende, Rosa
Pozo, Alejandro del
Martínez-Carrasco, Rafael
Pérez Pérez, Pilar
author_facet Gutiérrez del Pozo, Diego
Morcuende, Rosa
Pozo, Alejandro del
Martínez-Carrasco, Rafael
Pérez Pérez, Pilar
author_sort Gutiérrez del Pozo, Diego
title Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
title_short Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
title_full Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
title_fullStr Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
title_full_unstemmed Involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated CO2 of spring wheat
title_sort involvement of nitrogen and cytokinins in photosynthetic acclimation to elevated co2 of spring wheat
publisher Elsevier
url http://hdl.handle.net/10261/78335
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AT pozoalejandrodel involvementofnitrogenandcytokininsinphotosyntheticacclimationtoelevatedco2ofspringwheat
AT martinezcarrascorafael involvementofnitrogenandcytokininsinphotosyntheticacclimationtoelevatedco2ofspringwheat
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