Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica
Source-sink relationships of field-grown plants of Coffea arabica L. cultivar 'Caturra' were manipulated to analyze the contribution of soluble sugars to sink feedback down-regulation of maximal leaf net CO2 assimilation rate (Amax). Total soluble sugar concentration (SSCm) and Amax were measured in the morning and afternoon on mature leaves of girdled branches bearing either high or low fruit loads. Leaf Amax was negatively correlated to SSCm, increased with fruit load and decreased during the day, indicating that limiting sink demand for carbohydrates caused SSCa, to accumulate in the leaf tissue which results in down-regulation of Amax. To further analyze source-sink feedback on Am,x, we compared Amax of mature, non-sink-limited coffee leaves fed with water or sucrose for 5, 10 or 30 min with that of non-fed control leaves. Sucrose-feeding reduced Amax compared with the control and water-feeding treatments, indicating that down-regulation of Amax is related to phloem sucrose concentration in coffee source leaves, independent of SSC m concentration in other leaf tissues. Although sucrose appeared to be more closely related to the mechanism underlying sink feedback down-regulation of Amax in coffee leaves than SSCm, Amax was closely related to SSCm by a non-linear equation that may be useful for integrating sink limitations in coffee leaf photosynthetic models.
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Subjects: | F62 - Physiologie végétale - Croissance et développement, F61 - Physiologie végétale - Nutrition, Coffea arabica, physiologie végétale, sucres, photosynthèse, saccharose, feuille, phloème, http://aims.fao.org/aos/agrovoc/c_1721, http://aims.fao.org/aos/agrovoc/c_25189, http://aims.fao.org/aos/agrovoc/c_7507, http://aims.fao.org/aos/agrovoc/c_5812, http://aims.fao.org/aos/agrovoc/c_7495, http://aims.fao.org/aos/agrovoc/c_4243, http://aims.fao.org/aos/agrovoc/c_5787, |
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dig-cirad-fr-5306572024-01-28T14:16:34Z http://agritrop.cirad.fr/530657/ http://agritrop.cirad.fr/530657/ Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica. Franck Nicolas, Vaast Philippe, Génard Michel, Dauzat Jean. 2006. Tree Physiology, 26 (4) : 517-525.https://doi.org/10.1093/treephys/26.4.517 <https://doi.org/10.1093/treephys/26.4.517> Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica Franck, Nicolas Vaast, Philippe Génard, Michel Dauzat, Jean eng 2006 Tree Physiology F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 Source-sink relationships of field-grown plants of Coffea arabica L. cultivar 'Caturra' were manipulated to analyze the contribution of soluble sugars to sink feedback down-regulation of maximal leaf net CO2 assimilation rate (Amax). Total soluble sugar concentration (SSCm) and Amax were measured in the morning and afternoon on mature leaves of girdled branches bearing either high or low fruit loads. Leaf Amax was negatively correlated to SSCm, increased with fruit load and decreased during the day, indicating that limiting sink demand for carbohydrates caused SSCa, to accumulate in the leaf tissue which results in down-regulation of Amax. To further analyze source-sink feedback on Am,x, we compared Amax of mature, non-sink-limited coffee leaves fed with water or sucrose for 5, 10 or 30 min with that of non-fed control leaves. Sucrose-feeding reduced Amax compared with the control and water-feeding treatments, indicating that down-regulation of Amax is related to phloem sucrose concentration in coffee source leaves, independent of SSC m concentration in other leaf tissues. Although sucrose appeared to be more closely related to the mechanism underlying sink feedback down-regulation of Amax in coffee leaves than SSCm, Amax was closely related to SSCm by a non-linear equation that may be useful for integrating sink limitations in coffee leaf photosynthetic models. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/530657/1/document_530657.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1093/treephys/26.4.517 10.1093/treephys/26.4.517 info:eu-repo/semantics/altIdentifier/doi/10.1093/treephys/26.4.517 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1093/treephys/26.4.517 |
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F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 |
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F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 Franck, Nicolas Vaast, Philippe Génard, Michel Dauzat, Jean Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
description |
Source-sink relationships of field-grown plants of Coffea arabica L. cultivar 'Caturra' were manipulated to analyze the contribution of soluble sugars to sink feedback down-regulation of maximal leaf net CO2 assimilation rate (Amax). Total soluble sugar concentration (SSCm) and Amax were measured in the morning and afternoon on mature leaves of girdled branches bearing either high or low fruit loads. Leaf Amax was negatively correlated to SSCm, increased with fruit load and decreased during the day, indicating that limiting sink demand for carbohydrates caused SSCa, to accumulate in the leaf tissue which results in down-regulation of Amax. To further analyze source-sink feedback on Am,x, we compared Amax of mature, non-sink-limited coffee leaves fed with water or sucrose for 5, 10 or 30 min with that of non-fed control leaves. Sucrose-feeding reduced Amax compared with the control and water-feeding treatments, indicating that down-regulation of Amax is related to phloem sucrose concentration in coffee source leaves, independent of SSC m concentration in other leaf tissues. Although sucrose appeared to be more closely related to the mechanism underlying sink feedback down-regulation of Amax in coffee leaves than SSCm, Amax was closely related to SSCm by a non-linear equation that may be useful for integrating sink limitations in coffee leaf photosynthetic models. |
format |
article |
topic_facet |
F62 - Physiologie végétale - Croissance et développement F61 - Physiologie végétale - Nutrition Coffea arabica physiologie végétale sucres photosynthèse saccharose feuille phloème http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_25189 http://aims.fao.org/aos/agrovoc/c_7507 http://aims.fao.org/aos/agrovoc/c_5812 http://aims.fao.org/aos/agrovoc/c_7495 http://aims.fao.org/aos/agrovoc/c_4243 http://aims.fao.org/aos/agrovoc/c_5787 |
author |
Franck, Nicolas Vaast, Philippe Génard, Michel Dauzat, Jean |
author_facet |
Franck, Nicolas Vaast, Philippe Génard, Michel Dauzat, Jean |
author_sort |
Franck, Nicolas |
title |
Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
title_short |
Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
title_full |
Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
title_fullStr |
Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
title_full_unstemmed |
Soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown Coffea arabica |
title_sort |
soluble sugars mediate sink feedback down-regulation of leaf phtosynthesis in field-grown coffea arabica |
url |
http://agritrop.cirad.fr/530657/ http://agritrop.cirad.fr/530657/1/document_530657.pdf |
work_keys_str_mv |
AT francknicolas solublesugarsmediatesinkfeedbackdownregulationofleafphtosynthesisinfieldgrowncoffeaarabica AT vaastphilippe solublesugarsmediatesinkfeedbackdownregulationofleafphtosynthesisinfieldgrowncoffeaarabica AT genardmichel solublesugarsmediatesinkfeedbackdownregulationofleafphtosynthesisinfieldgrowncoffeaarabica AT dauzatjean solublesugarsmediatesinkfeedbackdownregulationofleafphtosynthesisinfieldgrowncoffeaarabica |
_version_ |
1792496379020443648 |