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Abstract:

In sparse canopies, low red to far-red (R/FR) ratios reach only vertically-oriented stems, which respond with faster rates of extension. It is shown here that this signal also promotes stem dry matter accumulation in sunflower (Helianthus annuus) but not in mustard (Sinapis alba L.). Physically blocking internode extension growth also blocked internode recovery of labelled carbon fed to the leaves, indicating that increased carbon accumulation is partially a consequence of increased extension growth in sunflower. However, low R/FR also promoted carbon accumulation in the lower section of the internode, where extension growth was unaffected. Although the levels of many soluble metabolites and of cell-wall carbohydrates increased in the stem in response to low R/FR, allowing conservation of their concentration, sucrose was present at a lower concentration under low R/FR. This change is anticipated to favour carbon unloading from the stem phloem. Low R/FR also reduced the levels of selected fatty acids, fatty acid alcohols, and sterols. Compared with the lower section, the upper section of the internode showed higher levels of organic acids, amino acids, fatty acids, and sterols. It is concluded that the promotion of stem extension growth by low R/FR ratios causes increased dry matter gain in sunflower internodes by a mechanism that is largely independent of changes in metabolism, since, whilst both low R/FR and ontogeny alter the metabolic profile, the changes do not correlate with the observed growth responses. © The Author [2008]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved.

Registro:

Documento: Artículo
Título:Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems
Autor:Mazzella, M.A.; Zanor, M.I.; Fernie, A.R.; Casal, J.J.
Filiación:INGEBI, Instituto de Investigaciones en Ingeniería Genética Y Biología Molecular, 1428-Buenos Aires, Argentina
IFEVA, Faculty of Agronomy, University of Buenos Aires and CONICET, 1417 Buenos Aires, Argentina
Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
Palabras clave:Carbohydrates; Metabolic profile; Phytochrome; Shade avoidance; Sunflower; Brassica; Helianthus; Helianthus annuus; Sinapis; Sinapis alba; amino acid; carbon; fatty acid; article; biomass; carbohydrate metabolism; comparative study; growth, development and aging; kinetics; light; metabolism; plant stem; sunflower; Amino Acids; Biomass; Carbohydrate Metabolism; Carbon; Fatty Acids; Helianthus; Kinetics; Light; Plant Stems
Año:2008
Volumen:59
Número:9
Página de inicio:2469
Página de fin:2477
DOI: http://dx.doi.org/10.1093/jxb/ern113
Título revista:Journal of Experimental Botany
Título revista abreviado:J. Exp. Bot.
ISSN:00220957
CODEN:JEBOA
CAS:amino acid, 65072-01-7; carbon, 7440-44-0; Amino Acids; Carbon, 7440-44-0; Fatty Acids
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220957_v59_n9_p2469_Mazzella

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Citas:

---------- APA ----------
Mazzella, M.A., Zanor, M.I., Fernie, A.R. & Casal, J.J. (2008) . Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems. Journal of Experimental Botany, 59(9), 2469-2477.
http://dx.doi.org/10.1093/jxb/ern113
---------- CHICAGO ----------
Mazzella, M.A., Zanor, M.I., Fernie, A.R., Casal, J.J. "Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems" . Journal of Experimental Botany 59, no. 9 (2008) : 2469-2477.
http://dx.doi.org/10.1093/jxb/ern113
---------- MLA ----------
Mazzella, M.A., Zanor, M.I., Fernie, A.R., Casal, J.J. "Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems" . Journal of Experimental Botany, vol. 59, no. 9, 2008, pp. 2469-2477.
http://dx.doi.org/10.1093/jxb/ern113
---------- VANCOUVER ----------
Mazzella, M.A., Zanor, M.I., Fernie, A.R., Casal, J.J. Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems. J. Exp. Bot. 2008;59(9):2469-2477.
http://dx.doi.org/10.1093/jxb/ern113