Short-term water stress leads to a stimulation of sucrose synthesis by activating sucrose-phosphate synthase View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1989-04

AUTHORS

Paul Quick, Gabi Siegl, Ekkehard Neuhaus, Regina Feil, Mark Stitt

ABSTRACT

The aim of this work was to identify which aspects of photosynthetic metabolism respond most sensitively to leaf water deficit. Spinach (Spinacia oleracea L.) leaf discs were floated on sorbitol concentrations of increasing molarity and changes of the protoplast volume were estimated using [(14)C]sorbitol and (3)H2O penetration. Detached leaves were also wilted until 10% of their fresh weight was lost. Photosynthesis was studied at very high external CO2 concentrations, to eliminate the effect of closing stomata. There was no large inhibition of CO2 fixation after wilting leaves, or until the external water deficit was greater than-1.2 MPa. However, partitioning changed markedly at these moderate water deficits: more sucrose and less starch was made. When an inhibition of CO2-saturated photosynthesis did appear at a water deficit of-2.0 MPa and above, measurements of chlorophyll-fluorescence quenching and metabolite levels showed the thylakoid reactions were not especially susceptible to short-term water stress. The inhibition was accompanied by a small increase of the triose phosphate: ribulose-1,5-bisphosphate ratio, showing regeneration of ribulose-1,5-bisphosphate was affected. However, there was also a general increase of the estimated concentrations of most metabolites, indicating that there is no specific site for the inhibition of photosynthesis. Increasing water deficit led to a large increase of fructose-2,6-bisphosphate. This is explained in terms of a simultaneous increase of fructose-6-phosphate and inorganic phosphate as the cell shrinks. The high fructose-2,6-bisphosphate led to the accumulation of triose phosphates, and the potential significance of this for protection against photoinhibition is discussed. There was an increase in the extractable activity of sucrose-phosphate synthase. This was only detected when the enzyme was assayed in conditions which distinguish between different kinetic forms which have previously been identified in spinach leaves. It is proposed that activation of sucrose-phosphate synthase is one of the first sites at which spinach leaves respond to a rising water deficit. This could be of importance for osmoregulation. More... »

PAGES

535-546

References to SciGraph publications

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  • Journal

    TITLE

    Planta

    ISSUE

    4

    VOLUME

    177

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00392622

    DOI

    http://dx.doi.org/10.1007/bf00392622

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1019035537

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/24212496


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    245 schema:name Lehrstuhl für Pflanzenphysiologie, Universität Bayreuth, D-8580, Bayreuth, Federal Republic of Germany
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