Article (Scientific journals)
Water stress drastically reduces root growth and inulin yield in Cichorium intybus (var. sativum) independently of photosynthesis
Vandoorne, Bertrand; Mathieu, Anne-Sophie; Van den Ende, Wim et al.
2012In Journal of Experimental Botany, 63 (12), p. 4359-4373
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Keywords :
water stress; chicory; inulin
Abstract :
[en] Root chicory (Cichorium intybus var. sativum) is a cash crop cultivated for inulin production in Western Europe. This plant could be exposed to severe water stress during the three last months of their six months growing period. The aim of this study was to quantify the effect of a progressive decline in water availability on plant growth, photosynthesis and sugar metabolism and to determine its impact on inulin production. Water stress drastically decreased root fresh and dry weight, leaf number, total leaf area and stomatal conductance. Stressed plants, however, increased their water use efficiency, decreased the shoot to root ratio and lowered their osmotic potential through soluble sugar accumulation. Despite a decrease in photosynthetic pigments, the light phase of the photosynthesis remained unaffected under water stress. Water stress increased sucrose phosphate synthase (SPS) activity in the leaves, but not in the roots. Water stress inhibited sucrose:sucrose 1-fructosyltransferase (1-SST) and fructan:fructan 1 fructosyltransferase (1—FFT) after 19 weeks of culture and slightly increased fructan 1-exohydrolase activities (1-FEH). The root inulin concentration and the mean degree of polymerisation (DP) of the inulin chain remained however unaffected by water stress. It is concluded that root chicory displayed resistance to water stress, but that such a resistance is obtained at the expense of growth which, in turn, leads to significant decrease in inulin production.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Vandoorne, Bertrand;  Université Catholique de Louvain - UCL > Earth and Life Institute > Groupe de Recherche en Physiologie végétale
Mathieu, Anne-Sophie;  Université Catholique de Louvain - UCL > Earth and Life Institute > Groupe de Recherche en Physiologie végétale
Van den Ende, Wim;  Katholieke Universiteit Leuven - KUL > Institute of Botany and Microbiology > Molecular Plant Physiology
Vergauwen, Rudy;  Katholieke Universiteit Leuven - KUL > Institute of Botany and Microbiology > Molecular Plant Physiology
Périlleux, Claire ;  Université de Liège - ULiège > Département des sciences de la vie > Physiologie végétale
Javaux, Mathieu;  Université Catholique de Louvain - UCL > Earth and Life Institute > Environmental Sciences
Lutts, Stanley;  Université Catholique de Louvain - UCL > Earth and Life Institute > Groupe de Recherche en Physiologie végétale
Language :
English
Title :
Water stress drastically reduces root growth and inulin yield in Cichorium intybus (var. sativum) independently of photosynthesis
Publication date :
2012
Journal title :
Journal of Experimental Botany
ISSN :
0022-0957
eISSN :
1460-2431
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
63
Issue :
12
Pages :
4359-4373
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
SPW - DG06
Available on ORBi :
since 08 May 2012

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