Abstract
Barley (Hordeum vulgare L., cvs Golf and Laevigatum) was grown under nitrogen limitation, controlled by the relative rate of nitrate-N addition (RA), in solution culture. The seminal and crown root systems were kept apart, but in contact with the same nutrient solution throughout culturing. Growth, nitrate uptake, and in vitro nitrate reductase (NR) activity in the different root parts were studied at plant ages from 40 (late vegetative stage) to 110 (mid grain-filling) days. The RA was during this time interval stepwise decreased from 0.08 day−1 to 0.005 day−1. The ratio between seminal root dry weight and total plant dry weight decreased drastically during post-anthesis growth, whereas the contribution by crown roots remained unchanged. Tissue nitrogen concentrations in seminal roots did not change with time, but decreased in crown roots after day 80. The NR activity decreased with age in both seminal and crown roots. The Vmax for net nitrate uptake decreased throughout the experiment in the seminal root system, but not in the crown root system. The kinetic properties (Vmax and KM) were used to calculate the nitrate concentration required to maintain a relative rate of nitrate-N uptake that equals the relative addition rate. These concentrations (2 to 5 mmol m−3) were found to closely match actually measured nitrate concentrations in the nutrient solution (1 to 6 mmol m−3). From uptake kinetics, it was deduced that the contribution by seminal roots to total nitrate uptake at these concentrations decreased from more than 50% in vegetative plants, to about 20% just after main shoot anthesis, and to less than 5% during grain-filling. ei]Section editor: H Lambers
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References
Anderson-Taylor G and Marshall C 1983 Root-tiller interrelationships in spring barley (Hordeum distichum L. Lam.). Ann. Bot. 51, 47–58.
Boatwright G O and Ferguson H 1967 Influence of primary and/or adventious root systems on wheat production and nutrient uptake. Agron. J. 59, 299–302.
Freijsen A H J, Troelstra S R, Otten H and Van der Meulen M A 1989 The relationship between the specific absorption rate and extremely low ambient nitrate concentrations under steady-state conditions. Plant and Soil 117, 121–127.
Fusseder A 1987 The longevity and activity of the primary root of maize. Plant and Soil 101, 257–265.
Gorny A G 1989 Study on the significance of seminal and adventitious roots for the shoot performance in spring barley and oats. Cereal Res. Commun. 187–193.
Gregory P J, McGowan M, Biscoe P V and Hunter B 1978 Water relations of winter wheat. I. Growth of the root system. J. Agric. Sci. 91, 91–102.
Ingemarsson B, Oscarson P, af Ugglas M and Larsson C-M 1987 Nitrogen utilization in Lemna. I. Relations between net nitrate flux, nitrate reduction, and in vitro activity and stability of nitrate reductase. Plant Physiol. 85, 856–859.
Ingestad T 1982 Reltive addition rate and external concentration: Driving variables used in plant nutrition research. Plant Cell Environ. 5, 443–453.
Kleinhofs A, Warner R L, Lawrence J M, Melzer J M, Jeter J M and Kudrna D A 1989. Molecular genetics of nitrate reductase in barley. In Molecular and Genetic Aspects of Nitrate Assimilation. Eds. J L Wray and J R Kinghorn. pp 197–211. Oxford Science Publications, Oxford.
Klepper B 1991 Root-shoot relationships. In Plant Roots. The Hidden Half. Eds. Y Waisel, A Eshel and U Kafkafi. pp 265–286. Marcel Dekker Inc., New York, Basel, Hongkong.
Kuhlmann H and Barraclough P B 1987 Comparison between the seminal and nodal root systems of winter wheat in their activity for N and K uptake. Z. Pflanzenernaehr. Bodenkd. 150, 24–30.
Larsson C-M and Oscarson P 1990 Growth and nitrate uptake properties of higher plants: Relations to external and internal nitrogen. In Inorganic Nitrogen in Plants and Microorganisms: Uptake and Metabolism. Eds. W R Ullrich, C Rigano, A Fuggi and P J Aparicio. pp 37–43. Springer-Verlag, Berlin.
MacKey J 1973 The wheat root. Proc. 4th Int. Wheat Genet. Symp., Colombia 1973, Missouri Agric. Exp. Sta. Columbia, 827–842.
Mattsson M, Lundborg T and Larsson C-M 1988 Nitrate utilization in barley: Relations to nitrate supply and light/dark cycles. Physiol. Plant. 73, 380–386.
Mattsson M, Johansson E, Lundborg T, Larsson M and Larsson C-M 1991 Nitrogen utilization in N-limited barley during vegetative and generative growth. I. Growth and nitrate uptake kinetics in vegetative cultures grown at different relative addition rates of nitrate-N. J. Exp. Bot. 42, 197–205.
Mattsson M, Lundborg T, Larsson M and Larsson C-M 1992a Nitrogen utilization in N-limited barley during vegetative and generative growth. II. Method for monitoring generative growth and development in solution culture. J. Exp. Bot. 43, 15–23.
Mattsson M, Lundborg T, Larsson M and Larsson C-M 1992b Nitrogen utilization in N-limited barley during vegetative and generative growth. III. Post-anthesis kinetics of net nitrate uptake and the role of the relative root size in determining the capacity for nitrate acquisition. J. Exp. Bot. 43, 25–30.
O'Brien L 1979 Genetic variability of root growth in wheat (Triticum aestivum L.). Aust. J. Agric. Res. 30, 587–595.
Öhlén E and Larsson C-M 1992 Nitrate assimilatory properties of barley grown under long-term N utilization: Effects of local nitrate supply in split-root cultures. Physiol. Plant. 85, 9–16.
Oscarson P and Larsson C-M 1986 Relations between uptake and utilization of NO3-in Pisum growing exponentially under nitrogen limitation. Physiol. Plant. 67, 109–117.
Oscarson P, Ingemarsson B and Larsson C M 1989 Growth and nitrate uptake properties of plants grown at different relative rates of nitrogen supply. II. Activity and affinity of the nitrate uptake system in Pisum and Lemna in relation to nitrogen availability and nitrogen demand. Plant Cell Environ. 12, 787–794.
Passioura J B 1972 The effect of root geometry on the yield of wheat growing on stored water. Aust. J. Agric. Res. 23, 745–752.
Reed A J and Hageman R H 1980 Relationship between nitrate uptake, flux, and reduction and the accumulation of reduced nitrogen in maize (Zea mays L.) I. Genotypic variation. Plant Physiol. 66, 1179–1183.
Russel R S 1977 The growth and form of root systems. In Plant Root Systems: Their Function and Interaction with the Soil. Ed. R S Russel. pp 30–61. McGraw-Hill, Book Company (UK) Limited, London.
Russel R S and Sanderson J 1967 Nutrient uptake by different parts of the intact roots of plants. J. Exp. Bot. 18, 491–508.
Tennant D 1976 Root growth of wheat. I. Early pattern of multiplication and extension of wheat roots including effects of levels of nitrogen, phosphorus and potassium. Aust. J. Agric. Res. 1976, 27, 183–196.
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Mattsson, M., Lundborg, T. & Larsson, CM. Growth and development of seminal and crown root systems in N-limited barley, and their contributions to nitrate acquisition during vegetative and generative growth. Plant Soil 151, 239–247 (1993). https://doi.org/10.1007/BF00016289
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DOI: https://doi.org/10.1007/BF00016289