Journal of Experimental Botany, Vol 50, 1817-1826, Copyright © 1999 by Oxford University Press
A Morvan-Bertrand, J Boucaud and M Prud'homme
An experiment was designed to evaluate the role of N and C reserves on
regrowth of Lolium perenne cv. Bravo following
defoliation. By using two nitrogen fertilization levels together with three
photoperiodic conditions, plants with variable contents of water-soluble
carbohydrates (43-216 mg g-1 DW in stubble) and
contrasting amounts of nitrogen (7-49 mg g-1 DW)
were obtained. Plants were severely defoliated and regrowth was followed
for 28 d under the same environmental conditions. The yield of leaf dry
matter at the end of the regrowth period was not related to the initial
level of carbohydrate reserves. However, levels of fructan in leaf sheaths
and in elongating leaf bases strongly influenced the shoot yield during the
first 2 d following defoliation. Fructan exohydrolase activity increased
2-3-fold in sheaths and 3.5-5-fold in elongation leaf bases, suggesting
that not only fructans from sheaths but also fructans from immature cells
may be used as substrates for growth. In contrast, no direct relationship
was found between shoot production and nitrogen or soluble protein
accumulation in source organs during early regrowth. A significant
correlation existed with the initial amount of soluble proteins in sheaths
and in elongating leaf bases after only 6 d of regrowth.
Keywords: Defoliation, regrowth, ryegrass, fructans,
nitrogen reserve
ARTICLES
Influence of initial levels of carbohydrates, fructans, nitrogen, and soluble proteins on regrowth of Lolium perenne L. cv. Bravo following defoliation
U.A. INRA Physiologie et Biochimie Végétales, Institut de Biologie en Recherche Appliquée, Université Esplanade de la Paix, 14032 Caen Cedex, France; Corresponding author; Fax: +33 2 31 56 53 60; E-mail: prudhomme@ibba.unicaen.fr
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  J. Lothier, B. Lasseur, K. Le Roy, A. Van Laere, M.-P. Prud'homme, P. Barre, W. Van den Ende, and A. Morvan-Bertrand Cloning, gene mapping, and functional analysis of a fructan 1-exohydrolase (1-FEH) from Lolium perenne implicated in fructan synthesis rather than in fructan mobilization J. Exp. Bot., June 1, 2007; 58(8): 1969 - 1983. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. MEURIOT, J.-C. AVICE, J.-C. SIMON, P. LAINE, M.-L. DECAU, and A. OURRY Influence of Initial Organic N Reserves and Residual Leaf Area on Growth, N Uptake, N Partitioning and N Storage in Alfalfa (Medicago sativa) during Post-cutting Regrowth Ann. Bot., August 1, 2004; 94(2): 311 - 321. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. Amiard, A. Morvan-Bertrand, J.-P. Billard, C. Huault, and M.-P. Prud'homme Fate of fructose supplied to leaf sheaths after defoliation of Lolium perenne L.: assessment by 13C-fructose labelling J. Exp. Bot., April 1, 2003; 54(385): 1231 - 1243. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Dhont, Y. Castonguay, P. Nadeau, G. Belanger, and F.-P. Chalifour Alfalfa Root Carbohydrates and Regrowth Potential in Response to Fall Harvests Crop Sci., May 1, 2002; 42(3): 754 - 765. [Abstract] [Full Text] [PDF]
|
|