Full TGIF Record # 63690
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Publication Type:
Author(s):Paterson, Eric; Sim, Allan
Author Affiliation:Plants Group, The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, UK
Title:Rhizodeposition and C-partitioning of Lolium perenne in azenic culture affected by nitrogen supply and defoliation
Source:Plant and Soil. Vol. 216, No. 1/2, 1999, p. 155-164.
# of Pages:10
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1023/A%3A1004789407065
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Lolium perenne; Nitrogen; Defoliation; Carbon; Partitioning; Roots; Morphology; Root length; Grasslands; Uptake; Dry weight; Root-shoot ratio; Root weight; Nitrogen fertilization; Nitrogen partitioning
Abstract/Contents:"The study investigated the effects of N-supply and partial defoliation on C-partitioning, root morphology and soluble rhizodeposition, for Lolium perenne grown in axenic sand culture systems percolated with nutrient solution. Plants were grown for 36 d in nutrient solutions with differing N concentrations (4mM or 0.02 mM NH₄ + NO₃-), and effects of repeated defoliation to 4 cm were determined. The 'low N' supply reduced (P < 0.05) dry matter accumulation, with proportionately increased partitioning to the root systems. Root morphology was also altered at 'low N', with development of a finer root system, manifest as increased (P < 0.05) specific root length. Concurrent with these effects on growth of L. perenne, 'low N' increased (P < 0.05) exudation of C-compounds from roots on a per g root basis. Defoliation was found to increase exudation (P < 0.05) of soluble compounds for periods of 3-5 d following each cut, at both N-supply rates. The effects of N-supply and defoliation are of importance in understanding the coupling of plant productivity to nutrient cycling in soils with differing N availabilities and for grassland systems which are subject to grazing."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Paterson, E., and A. Sim. 1999. Rhizodeposition and C-partitioning of Lolium perenne in azenic culture affected by nitrogen supply and defoliation. Plant Soil. 216(1/2):p. 155-164.
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