Full TGIF Record # 61474
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Web URL(s):https://link.springer.com/article/10.1023/A%3A1004534609280
    Last checked: 09/25/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
Publication Type:
i
Refereed
Author(s):Mackie-Dawson, L. A.
Author Affiliation:Macaulay Land USe Research Institute, Craigiebuckler, Aberdeen, UK
Title:Nitrogen uptake and root morphological responses of defoliated Lolium perenne(L.) to a heterogeneous nitrogen supply
Source:Plant and Soil. Vol. 209, No. 1, 1999, p. 111-118.
# of Pages:8
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Keywords:TIC Keywords: Nitrogen uptake; Morphology; Roots; Lolium perenne; Defoliation; Grassland soils; Responses; Root inhibition; Root growth; Distribution patterns; Turfgrass quality; Tillers (vegetative); Biomass
Cultivar Names:Magella
Abstract/Contents:"Lolium perenne L. (c.v. Magella) plants were grown under three nutrient treatments for six weeks and then defoliated to test the hypothesis that for their regrowth they could acquire N equally well irrespective of N distribution. Two different N levels were applied; uniform level 1 N (U1), uniform level 2 (U2) and heterogeneous level 2 (H2). A system where the nutrient patch could be applied without barrier to root growth was adopted. A single defoliation to 4 cm height resulted in reduction in tillering, biomass increment and N uptake at 3 weeks after defoliation. Root growth was reduced by defoliation under all N treatments. Defoliation was found to reduce the proportion of N in the shoots which was derived from root uptake from 7 to 14 days. At 21 days this effect was significant for the plants with a heterogeneously distributed supply only. By the end of the regrowth period, the undefoliated plants from H2 had a shoot biomass and N content equal to that of the plants receiving the same total N but supplied homogeneously (U2). However, defoliation reduced the ability of the plant to acquire N from the patch. No preferential root growth was measured into the N-rich patch, but an increased root diameter within the patch was found. Root diameter was reduced by defoliation, coinciding with a reduction in the concentration of N in the root tissue. As a result of the increased sink strength of the growing leaves after defoliation, the roots may become a source of carbon and also nitrogen. These responses to an N-rich patch under defoliation could alter a plant's competitive balance in a mixed sward."
Language:English
References:43
Note:Tables
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mackie-Dawson, L. A. 1999. Nitrogen uptake and root morphological responses of defoliated Lolium perenne(L.) to a heterogeneous nitrogen supply. Plant Soil. 209(1):p. 111-118.
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Web URL(s):
https://link.springer.com/article/10.1023/A%3A1004534609280
    Last checked: 09/25/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
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