Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems
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 bloc...
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todo:paper_00220957_v59_n9_p2469_Mazzella2023-10-03T14:26:13Z Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems Mazzella, M.A. Zanor, M.I. Fernie, A.R. Casal, J.J. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00220957_v59_n9_p2469_Mazzella |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Mazzella, M.A. Zanor, M.I. Fernie, A.R. Casal, J.J. |
| author_facet |
Mazzella, M.A. Zanor, M.I. Fernie, A.R. Casal, J.J. |
| author_sort |
Mazzella, M.A. |
| title |
Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| title_short |
Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| title_full |
Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| title_fullStr |
Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| title_full_unstemmed |
Metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| title_sort |
metabolic responses to red/far-red ratio and ontogeny show poor correlation with the growth rate of sunflower stems |
| url |
http://hdl.handle.net/20.500.12110/paper_00220957_v59_n9_p2469_Mazzella |
| work_keys_str_mv |
AT mazzellama metabolicresponsestoredfarredratioandontogenyshowpoorcorrelationwiththegrowthrateofsunflowerstems AT zanormi metabolicresponsestoredfarredratioandontogenyshowpoorcorrelationwiththegrowthrateofsunflowerstems AT ferniear metabolicresponsestoredfarredratioandontogenyshowpoorcorrelationwiththegrowthrateofsunflowerstems AT casaljj metabolicresponsestoredfarredratioandontogenyshowpoorcorrelationwiththegrowthrateofsunflowerstems |
| _version_ |
1782026156879380480 |