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- Title
Fate of fructose supplied to leaf sheaths after defoliation of Lolium perenne L.: assessment by 13C‐fructose labelling.
- Authors
Amiard, Véronique; Morvan-Bertrand, Annette; Billard, Jean-Pierre; Huault, Claude; Prud'homme, Marie-Pascale
- Abstract
The role of fructans from leaf sheaths for the refoliation of Lolium perenne after severe defoliation was assessed by following the fate of 13C‐fructose supplied to leaf sheaths at the time of defoliation. At the end of the 4 h labelling period on defoliated plants, 77% of the 13C incorporated was still located in leaf sheaths. Only 4% and 0.9% were, respectively, allocated to stem and roots, while 18% was imported by the growing leaves where 13C was allocated first to the proximal part of the leaf growth zone (0–10 mm). In all tissues, the most highly 13C‐labelled carbohydrates was not fructose but sucrose. In leaf sheaths, 13C‐loliose was produced. In the leaf growth zone (0–20 mm), fructans were simultanously synthesized from 13C entering the leaves and degraded. The export of 13C from leaf sheaths continued during the first day of regrowth but stopped afterwards. There was no net loss of C from 13C‐fructose over the first 2 d of regrowth. The role of fructans and loliose is discussed as well as the physiological mechanisms contributing to defoliation tolerance in L. perenne.
- Subjects
FRUCTANS; LEAVES; PLANT growth; FRUCTOSE; PLANT physiology
- Publication
Journal of Experimental Botany, 2003, Vol 54, Issue 385, p1231
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erg125