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JXB Advance Access published online on March 3, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erg125
© 2003 by Oxford University Press
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Received September 6, 2002; accepted January 2, 2003
© 2003 Society for Experimental Biology

RESEARCH PAPER

Fate of fructose supplied to leaf sheaths after defoliation of Lolium perenne L.: assessment by 13C-fructose labelling

Véronique Amiard 1, Annette Morvan-Bertrand 1, Jean-Pierre Billard 1, Claude Huault 1, Marie-Pascale Prud'homme 1*

1 UMR INRA-UCBN Physiologie et Biochimie Végétales, IRBA, Université de Caen, Esplanade de la Paix, F-14032 CAEN cedex, France

* To whom correspondence should be addressed. E-mail: prudhomme{at}ibba.unicaen.fr.


  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.

Key words: Fructans, glucose, leaf growth zone, loliose, regrowth, reserves, roots, sink strength, sucrose.


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