Regulation of nitrogen uptake on the whole plant level
- M. K. Schenk
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The largest part of nitrogen requirements of crops is mostly covered by nitrate. The uptake of this ion is thermodynamically uphill and thus dependent on metabolism. This article considers regulation of N uptake in higher plants putting emphasis on NO3 - and the whole plant level.
In field conditions the transport rate depends on the concentration at the root surface in Michaelis-Menten-Kinetics. Maximum net influx of NO3 - (Imax) was often reported at concentrations of 100 μM NO3 - and even lower. There are indications that for unrestricted growth the NO3 - concentration at root surface has to be in the order of magnitude allowing Imax if plants are not able to compensate for lower NO3 - concentrations by increasing root surface per unit of shoot.
Imax is not a constant but depends for a given variety on N status of plants, the availability of NO3 - and plant age. The decrease of Imax with increasing plant age is closely related to relative growth rate as long as the relationship between N demand and new growth is linear and the root:shoot ratio keeps constant. It seems that Imax is a meaningful physiological characteristic of NO3 - uptake reflecting absolute N demand. There is evidence that shoot demand is linked to NO3 - uptake of the root through an amino acid transport pool cycling in the plant via phloem and xylem.
The N demand of a crop depends on increase of dry mass and might not be linear if the “critical level” of nitrogen in plant dry matter changes during crop development or if retranslocation of nitrogen from older leaves to meristematic tissue occurs. Radiation and temperature drive plant growth and thus N demand of crops. These relationships can be described by mathematical models.
- Barber S A 1984 Soil Nutrient Bioavailability—A Mechanistic Approach. Academic Press, New York.
- Clarkson D T 1986 Regulation of the absorption and release of nitrate by plant cells: A review of current ideas and methodology. In Fundamental, Ecological and Agricultural Aspects of Nitrogen Metabolism in Higher Plants. Eds. HLambers, J JNeeteson and IStulen. pp 3–12. Martinus Nijhoff Publ. Boston, USA.
- Cooper H D and Clarkson D T 1989 Cycling of amino-nitrogen and other nutrients between shoots and roots in cereals—A possible mechanism integrating shoot and root in the regulation of nutrient uptake. J. Exp. Bot. 40, 753–762.
- Edwards J H and Barber S A 1976a Nitrogen uptake characteristics of corn roots at low N concentration as influenced by plant age. Agron. J. 68, 17–19.
- Edwards J H and Barber S A 1976b Nitrogen flux into corn roots as influenced by shoot requirement. Agron. J. 68, 471–473.
- Glass A D M and Siddiqi M Y 1984 The control of nutrient uptake rates in relation to the inorganic composition of plants. In Advances in Plant Nutrition 1. Eds. P BTinker and ALäuchli, pp 103–147, Praeger, New York, USA.
- Glass A D M 1988 Nitrogen uptake by plant roots. ISI Atlas of Plant Science: Plants and Animals 1, 151–156.
- Heins B and Schenk M K 1987 Root growth and nitrate uptake of vegetable crops. J. Plant Nutr. 10, 1743–1751.
- Jungk A 1970 Mineralstoff- und Wassergehalt in Abhängigkeit von der Entwicklung von Pflanzen. Z. Pflanzenernähr. Bodenkd. 125, 119–129.
- 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. Pflanzenernähr. Bodenkd. 150, 24–30.
- Lewis O A M 1986 Plants and Nitrogen Edward Arnold, London.
- Liebig H P 1989 Models to predict crop growth. Acta Hortic. 248, 55–68.
- Nye P H and Tinker P B 1977 Solute Movements in the Soil-root System. Studies in Ecology Vol. 4. Blackwell Scientific Publications, Oxford, UK.
- Oaks A 1986 Biochemical aspects of nitrogen metabolism in a whole plant context. In Fundamental, Ecological and Agricultural Aspects of Nitrogen Metabolism in Higher Plants. Eds. HLambers, J JNeeteson and IStulen. pp 3–21. Martinus Nijhoff Publ. Boston, USA.
- Olsen C 1950 The significance of concentration for the rate of ion absorption by higher plants in water culture. Physiol. Plant. 3, 152–164.
- Pitman M G and Cram W J 1976 Regulation of ion content in whole plants. Symp. Soc. Exp. Bot. 31, 391–424.
- Rodgers C O and Barneix A J 1988 Cultivar differences in the rate of nitrate uptake by intact wheat plants as related to growth rate. Physiol. Plant. 72, 121–126.
- Schacht H and Schenk M K 1990 Control of nitrogen supply of cucumber (Cucumis sativus) grown in soilless culture. In Plant Nutrition-Physiology and Application. Ed. M LBeusichem. pp 753–758. Kluwer Academic Publishers. Dordrecht, the Netherlands.
- Simpson R J, Lambers H and Dalling M J 1982 Translocation of nitrogen in a vegetative wheat plant. Physiol. Plant. 56, 11–17.
- Steingrobe B and Schenk M K 1991 Influence of nitrate concentration at the root surface on yield and nitrate uptake of kohlrabi and spinach. Plant and Soil 35, 205–211/
- Steingrobe B and Schenk M K 1994 A model relating the maximum nitrate inflow of lettuce (Lactuca sativa L.) to the growth of roots and shoots. Plant and Soil 162, 249–257.
- White R E 1973 Studies on mineral ion absorption by plants. II. The interaction between metabolic activity and the rate of phosphorus uptake. Plant and Soil 38, 509–523.
- Wild A and Breeze V G 1981 Nutrient uptake in relation to growth. In Physiological Processes limiting Plant Productivity. Ed. D EJohnson. pp 331–344 Butterworths, London, UK.
- Regulation of nitrogen uptake on the whole plant level
Plant and Soil
Volume 181, Issue 1 , pp 131-137
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- growth rate
- maximum inflow (Imax)
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- M. K. Schenk (1)
- Author Affiliations
- 1. Institute of Plant Nutrition, University of Hannover, Herrenhäuser Str. 2, D-30419, Hannover, Germany