Sink feedback regulation of photosynthesis in vines: measurements and a model
Identifieur interne : 002463 ( Istex/Corpus ); précédent : 002462; suivant : 002464Sink feedback regulation of photosynthesis in vines: measurements and a model
Auteurs : Anne Quereix ; Roderick C. Dewar ; Jean-Pierre Gaudillere ; Sylvia Dayau ; Charles ValancogneSource :
- Journal of Experimental Botany [ 0022-0957 ] ; 2001-12-01.
English descriptors
- KwdEn :
Abstract
An experimental and modelling study of source–sink interactions in Vitis vinifera L., cv. Cabernet Sauvignon, rooted cuttings under non‐limiting environmental conditions with a 12 h photoperiod is presented here. After 4 h, measured photosynthesis, stomatal conductance and leaf carbohydrate content reached maximum values. Over the remainder of the photoperiod, photosynthesis and stomatal conductance decreased continuously, whereas leaf carbohydrate content remained relatively constant. Because the experiment took place in a non‐limiting environment, the results suggest that stomatal regulation of photosynthesis was mediated by an internal factor, possibly related to sink activity. A simple 1‐source, 2‐sink model was developed to examine the extent to which the data could be explained by a hypothetical sink‐to‐source feedback mechanism mediated by carbohydrate levels in either the mesophyll, the source phloem or the phloem of one of the two sinks. Model simulations reproduced the data well under the hypothesis of a phloem‐based feedback signal, although the data were insufficient to elucidate the detailed nature of such a signal. In a sensitivity analysis, the steady‐state response of photosynthesis to sink activity was explored and predictions made for the partitioning of photosynthate between the two sinks. The analysis highlights the effectiveness of a phloem‐based feedback signal in regulating the balance between source and sink activities. However, other mechanisms for the observed decline in photosynthesis, such as photoinhibition, endogenous circadian rhythms or hydraulic signals in the leaf cannot be excluded. Nevertheless, it is concluded that the phloem‐based feedback model developed here may provide a useful working hypothesis for incorporation into plant growth models and for further development and testing.
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DOI: 10.1093/jexbot/52.365.2313
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<front><div type="abstract" xml:lang="en">An experimental and modelling study of source–sink interactions in Vitis vinifera L., cv. Cabernet Sauvignon, rooted cuttings under non‐limiting environmental conditions with a 12 h photoperiod is presented here. After 4 h, measured photosynthesis, stomatal conductance and leaf carbohydrate content reached maximum values. Over the remainder of the photoperiod, photosynthesis and stomatal conductance decreased continuously, whereas leaf carbohydrate content remained relatively constant. Because the experiment took place in a non‐limiting environment, the results suggest that stomatal regulation of photosynthesis was mediated by an internal factor, possibly related to sink activity. A simple 1‐source, 2‐sink model was developed to examine the extent to which the data could be explained by a hypothetical sink‐to‐source feedback mechanism mediated by carbohydrate levels in either the mesophyll, the source phloem or the phloem of one of the two sinks. Model simulations reproduced the data well under the hypothesis of a phloem‐based feedback signal, although the data were insufficient to elucidate the detailed nature of such a signal. In a sensitivity analysis, the steady‐state response of photosynthesis to sink activity was explored and predictions made for the partitioning of photosynthate between the two sinks. The analysis highlights the effectiveness of a phloem‐based feedback signal in regulating the balance between source and sink activities. However, other mechanisms for the observed decline in photosynthesis, such as photoinhibition, endogenous circadian rhythms or hydraulic signals in the leaf cannot be excluded. Nevertheless, it is concluded that the phloem‐based feedback model developed here may provide a useful working hypothesis for incorporation into plant growth models and for further development and testing.</div>
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<journal-id journal-id-type="nlm-ta">J Exp Bot</journal-id>
<journal-id journal-id-type="publisher-id">exbotj</journal-id>
<journal-title>Journal of Experimental Botany</journal-title>
<abbrev-journal-title abbrev-type="publisher">J. Exp. Bot.</abbrev-journal-title>
<issn pub-type="ppub">0022-0957</issn>
<issn pub-type="epub">1460-2431</issn>
<publisher><publisher-name>Oxford University Press</publisher-name>
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<article-categories><subj-group subj-group-type="heading"><subject>Regulation of Growth, Development and Whole Organism Physiology</subject>
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<title-group><article-title>Sink feedback regulation of photosynthesis in vines: measurements and a model</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Quereix</surname>
<given-names>Anne</given-names>
</name>
<xref rid="AFF1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Dewar</surname>
<given-names>Roderick C.</given-names>
</name>
<xref rid="AFF1"><sup>1</sup>
</xref>
<xref rid="FN1"><sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Gaudillere</surname>
<given-names>Jean‐Pierre</given-names>
</name>
<xref rid="AFF2"><sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Dayau</surname>
<given-names>Sylvia</given-names>
</name>
<xref rid="AFF1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Valancogne</surname>
<given-names>Charles</given-names>
</name>
<xref rid="AFF1"><sup>1</sup>
</xref>
</contrib>
<aff id="AFF1"><label>1</label>
Unité de Bioclimatologie, INRA, Centre de Bordeaux, BP81, 33883 Villenave d'Ornon CEDEX, France</aff>
<aff id="AFF2"><label>2</label>
Unité d'Agronomie, INRA, Centre de Bordeaux, BP81, 33883 Villenave d'Ornon CEDEX, France</aff>
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<pub-date pub-type="ppub"><day>1</day>
<month>12</month>
<year>2001</year>
</pub-date>
<volume>52</volume>
<issue>365</issue>
<fpage>2313</fpage>
<lpage>2322</lpage>
<history><date date-type="accepted"><day>6</day>
<month>07</month>
<year>2001</year>
</date>
<date date-type="received"><day>30</day>
<month>01</month>
<year>2001</year>
</date>
</history>
<permissions><copyright-statement>© Society for Experimental Biology</copyright-statement>
<copyright-year>2001</copyright-year>
</permissions>
<abstract xml:lang="en"><p>An experimental and modelling study of source–sink interactions in <italic>Vitis vinifera</italic>
L., cv. Cabernet Sauvignon, rooted cuttings under non‐limiting environmental conditions with a 12 h photoperiod is presented here. After 4 h, measured photosynthesis, stomatal conductance and leaf carbohydrate content reached maximum values. Over the remainder of the photoperiod, photosynthesis and stomatal conductance decreased continuously, whereas leaf carbohydrate content remained relatively constant. Because the experiment took place in a non‐limiting environment, the results suggest that stomatal regulation of photosynthesis was mediated by an internal factor, possibly related to sink activity. A simple 1‐source, 2‐sink model was developed to examine the extent to which the data could be explained by a hypothetical sink‐to‐source feedback mechanism mediated by carbohydrate levels in either the mesophyll, the source phloem or the phloem of one of the two sinks. Model simulations reproduced the data well under the hypothesis of a phloem‐based feedback signal, although the data were insufficient to elucidate the detailed nature of such a signal. In a sensitivity analysis, the steady‐state response of photosynthesis to sink activity was explored and predictions made for the partitioning of photosynthate between the two sinks. The analysis highlights the effectiveness of a phloem‐based feedback signal in regulating the balance between source and sink activities. However, other mechanisms for the observed decline in photosynthesis, such as photoinhibition, endogenous circadian rhythms or hydraulic signals in the leaf cannot be excluded. Nevertheless, it is concluded that the phloem‐based feedback model developed here may provide a useful working hypothesis for incorporation into plant growth models and for further development and testing.</p>
</abstract>
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L.</kwd>
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<kwd>sink</kwd>
<kwd>feedback</kwd>
<kwd>model.</kwd>
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<name type="personal"><namePart type="given">Anne</namePart>
<namePart type="family">Quereix</namePart>
<affiliation>Unité de Bioclimatologie, INRA, Centre de Bordeaux, BP81, 33883 Villenave d'Ornon CEDEX, France</affiliation>
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<name type="personal"><namePart type="given">Roderick C.</namePart>
<namePart type="family">Dewar</namePart>
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<name type="personal"><namePart type="given">Jean‐Pierre</namePart>
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<name type="personal"><namePart type="given">Sylvia</namePart>
<namePart type="family">Dayau</namePart>
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<name type="personal"><namePart type="given">Charles</namePart>
<namePart type="family">Valancogne</namePart>
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<abstract lang="en">An experimental and modelling study of source–sink interactions in Vitis vinifera L., cv. Cabernet Sauvignon, rooted cuttings under non‐limiting environmental conditions with a 12 h photoperiod is presented here. After 4 h, measured photosynthesis, stomatal conductance and leaf carbohydrate content reached maximum values. Over the remainder of the photoperiod, photosynthesis and stomatal conductance decreased continuously, whereas leaf carbohydrate content remained relatively constant. Because the experiment took place in a non‐limiting environment, the results suggest that stomatal regulation of photosynthesis was mediated by an internal factor, possibly related to sink activity. A simple 1‐source, 2‐sink model was developed to examine the extent to which the data could be explained by a hypothetical sink‐to‐source feedback mechanism mediated by carbohydrate levels in either the mesophyll, the source phloem or the phloem of one of the two sinks. Model simulations reproduced the data well under the hypothesis of a phloem‐based feedback signal, although the data were insufficient to elucidate the detailed nature of such a signal. In a sensitivity analysis, the steady‐state response of photosynthesis to sink activity was explored and predictions made for the partitioning of photosynthate between the two sinks. The analysis highlights the effectiveness of a phloem‐based feedback signal in regulating the balance between source and sink activities. However, other mechanisms for the observed decline in photosynthesis, such as photoinhibition, endogenous circadian rhythms or hydraulic signals in the leaf cannot be excluded. Nevertheless, it is concluded that the phloem‐based feedback model developed here may provide a useful working hypothesis for incorporation into plant growth models and for further development and testing.</abstract>
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<topic>Vitis vinifera L.</topic>
<topic>photosynthesis</topic>
<topic>sink</topic>
<topic>feedback</topic>
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