Full TGIF Record # 86400
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Web URL(s):http://www.springerlink.com/media/2DKLQMYHMPK4K8XVNNR7/Contributions/Q/0/3/H/Q03H82J07128069R.pdf
    Last checked: 03/2005
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Publication Type:
i
Refereed
Author(s):Paterson, Eric; Thornton, Barry; Sim, Allan; Pratt, Shona
Author Affiliation:The Macaulay Land Use Research Institute, Craigebuckler, Scotland, United Kingdom
Title:Effects of defoliation and atmospheric CO2 depletion on nitrate acquisition, and exudation of organic compounds by roots of Festuca rubra
Source:Plant and Soil. Vol. 250, No. 2, March 2003, p. 293-305.
# of Pages:13
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Keywords:TIC Keywords: Defoliation; Carbon dioxide; Nitrates; Festuca rubra; Roots; Physiology; Sand; Nitrogen uptake
Abstract/Contents:"The aim of this study was to investigate the physiological basis of increased root exudation from Festuca rubra, in response to defoliation. The hypothesis, that assimilate supply to roots is a key determinant of the response of root exudation to defoliation was tested by imposing CO2-deplete (< 50 μmol mol-1) atmospheres to F. rubra. This was done as a non-destructive means of preventing supply of new assimilate to roots of intact and defoliated plants. F. rubra was grown in axenic sand systems, with defoliation and CO2-depletion treatment applied to plants at 14 and 35 days after planting. Root exudation and NO3- uptake were quantified throughout, and post-treatment uptake and allocation of N were determined from the distribution of 15N label, supplied as 15NO3-. Defoliation of F. rubra resulted in significantly (P < 0.01) increased root exudation, CO2-depletion did not result in increased exudation from plants of either age. When treatments were applied to F. rubra after 14 days, defoliation and CO2-depletion each reduced NO3- uptake significantly (P < 0.05). However, in older plants, uptake of NO3- was less sensitive to defoliation and CO2-depletion. The results indicate that increased root exudation following defoliation is not related directly to reduced assimilate supply to roots. This was evident from the lack of effect of CO2-depletion on root exudation, and the absence of correlation between root-C efflux and the rate of NO3- uptake. The physiological basis of increased exudation following defoliation remains uncertain, but may be dependent on physical damage, either directly or as a consequence of systemic responses to wounding."
Language:English
References:37
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Paterson, E., B. Thornton, A. Sim, and S. Pratt. 2003. Effects of defoliation and atmospheric CO2 depletion on nitrate acquisition, and exudation of organic compounds by roots of Festuca rubra. Plant Soil. 250(2):p. 293-305.
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Web URL(s):
http://www.springerlink.com/media/2DKLQMYHMPK4K8XVNNR7/Contributions/Q/0/3/H/Q03H82J07128069R.pdf
    Last checked: 03/2005
    Requires: PDF Reader
    Access conditions: Item is within a limited access website
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