Full TGIF Record # 65885
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Web URL(s):https://link.springer.com/article/10.1023/A%3A1004728327955
    Last checked: 09/27/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
Publication Type:
i
Refereed
Author(s):Louahlia, S.; Lainé, P.; Thornton, B.; Ourry, A.; Boucaud, J.
Author Affiliation:Louahlia, Lainé, Ourry, and Boucaud: Physiologie et Biochimie Végétales, Institut de Recherche en Biologie Appliquée, Université, Caen Cedex, France; Thornton: Plants Group, Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, Scotland, UK
Title:The role of N-remobilisation and the uptake of NH₄⁺ and No₃⁻ by Lolium perenne L. in laminae growth following defoliation under field conditions
Source:Plant and Soil. Vol. 220, No. 1/2, 2000, p. 175-187.
# of Pages:13
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Keywords:TIC Keywords: Nitrogen; Nitrogen uptake; Ammonia; Nitrates; Lolium perenne; Isotopic exchange; Radioactive labeling; Growth; Defoliation; Nitrogen fixation; Shoot growth; Nutrient transport; Biomass; Roots; Dry weight; Nitrogen-fixing bacteria; Regrowth; Fertilization; Nitrogen fertilization
Cultivar Names:Ohio
Abstract/Contents:"Several studies have previously shown that shoot removal of forage species, either by cutting or herbivore grazing, results in a large decline in N uptake (60%) and/or N₂ fixation (80%). The source of N used for initial shoot growth following defoliation relies mainly on mobilisation of N reserves from tissues remaining after defoliation. To date, most studies investigating N-mobilisation have been conducted, with isolated plants grown in controlled conditions. The objectives of this study were for Lolium perenne L., grown in a dense canopy in field conditions, to determine: 1) the contribution of N-mobilisation, NH⁺₄ uptake and NO⁻₃ uptake to growing shoots after defoliation, and 2) the contribution of the high (HATS) and low (LATS) affinity transport systems to the total plant uptake of NH⁺₄ and NO⁻₃. During the first seven days following defoliation, decreases in biomass and N-content of roots (34% and 47%, respectively) and to a lesser extent stubble (18% and 43%, respectively) were observed, concomitant with mobilisation of N to shoots. The proportion and origin of N used by shoots (derived from reserves or uptake) was similar to data reported for isolated plants. Both HATS and LATS contributed to the total root uptake of NH⁺₄ and NO⁻₃. The V^D[mₐₓ of both the NH⁺₄ and the NO⁻₃ HATS increased as a function of time after defoliation, and both HATS systems were saturated by substrate concentrations in the soil at all times. The capacity of the LATS was reduced as soil NO⁻₋3 and NH⁺₄ concentrations decreased following defoliation. Data from ¹⁵N uptake by field-grown plants, and uptake rates of NH⁺₄ and NO⁻₃ estimated by excised root bioassays, were significantly correlated, though uptake was over-estimated by the later method. The results are discussed in terms of putative mechanisms for regulating N uptake following severe defoliation."
Language:English
References:36
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Louahlia, S., P. Lainé, B. Thornton, A. Ourry, and J. Boucaud. 2000. The role of N-remobilisation and the uptake of NH₄⁺ and No₃⁻ by Lolium perenne L. in laminae growth following defoliation under field conditions. Plant Soil. 220(1/2):p. 175-187.
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Web URL(s):
https://link.springer.com/article/10.1023/A%3A1004728327955
    Last checked: 09/27/2017
    Access conditions: Item is within a limited-access website
    Notes: Guide page
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