Fundamental, Ecological and Agricultural Aspects of Nitrogen Metabolism in Higher Plants : Proceedings of a Symposium Organized by the Department of Plant Physiology, University of Groningen and the Institute for Soil Fertility, Haren, 9–12 April 1985

Rinie Hofstra has been a member of the Department of Plant Physiology, University of Groningen, the Netherlands, for 24 years. The nearer we came to 31 March 1985, her 65th birthday, the more we all realized how we would miss her - not only scientifically, but also socially. She left her mark on both research and teaching, always with an open mind and willing to change. After her PhD Thesis on 'Nitrogen Metabolism in Tomato Plants' she first continued working in that field, but soon started a joint project with the Department of Plant Ecology on hemiparasites. She then became involved in carbon metabolism, which resulted in her giving a Biotrop Course on C /C metabolism in 3 4 Indonesia. Her own research group, originally working on 'Nitrogen Metabolism', soon embraced 'Energy and Nitrogen Metabolism', as the research on respiration became more and more important. In running her group she showed all sides of her person. She used to stimulate and encourage everyone around her and to integrate the various lines of research. At the same time she always had an open mind for the opinion of all members of her group. And together they regularly criticized and evaluated the various projects and decided how to continue. Front Matter....Pages i-xix Front Matter....Pages 1-1 Regulation of the absorption and release of nitrate by plant cells: A review of current ideas and methodology....Pages 3-27 The influence of the form and concentration of inorganic nitrogen supplied on nitrogen uptake by Ankistrodesmus falcatus ....Pages 29-31 Nitrate uptake and reduction in sugar-beet seedlings....Pages 33-36 Effects of root temperature on uptake of nitrate and ammonium ions by barley grown in flowing-solution culture....Pages 37-40 Nitrate-uptake characteristics of roots as affected by nitrate supply....Pages 41-45 A substrate cycling model for nitrate uptake by Pisum sativum seedlings: A key to sensitivity of response of net flux to substrate and effectors?....Pages 47-51 Nitrate and ammonium absorption by plants growing at a sufficient or insufficient level of phosphorus in nutrient solutions....Pages 53-58 Flow of N and activities of N-assimilating enzymes in roots of N-limited Pisum sativum ....Pages 59-63 Patterns of N uptake, accumulation and assimilation in Lemna gibba when grown with exponentially increasing daily doses of N....Pages 65-69 Translocation and metabolism of nitrogen: whole plant aspects....Pages 71-96 Cycling of amino-nitrogen between shoots and roots in wheat seedlings....Pages 97-100 Nitrogen retranslocation in plants of maize, lupin and cocklebur....Pages 101-105 Amino acid loading by minor veins of Commelina benghalensis : an integration of structural and physiological aspects....Pages 107-110 Tobacco mutants of amino acid membrane transport: Uptake of L-valine in leaf discs from the double mutant Val r -2 and its monogenic derivatives....Pages 111-114 Sink control of amino acid transport into developing seeds of Vicia faba and Pisum sativum ....Pages 115-117 Amino acid efflux from seed coats and from cotyledons of developing and germinating pea seeds....Pages 119-121 Translocation of labelled nitrogen in oilseed rape....Pages 123-125 Front Matter....Pages 127-129 Biochemical aspects of nitrogen metabolism in a whole plant context....Pages 131-131 An evaluation of the stoichiometry of in vitro nitrate assimilation in Zea mays ....Pages 133-151 Front Matter....Pages 153-157 Influence of boron on nitrate reductase activity in roots of Zea mays ....Pages 131-131 The influence of light and dark conditions on the reduction of nitrate in leaves and roots of maize....Pages 159-164 Root contribution to nitrate reduction in barley seedlings ( Hordeum vulgare L.)....Pages 165-168 Nitrogen metabolism in plastids of pea roots....Pages 169-172 Isozymes of glutamine synthetase in chickpea....Pages 173-176 Partitioning of reduced nitrogen derived from exogenous nitrate in maize roots: Initial priority for protein synthesis....Pages 177-179 A cysteine-stimulated in vitro inactivation of barley leaf nitrate reductase....Pages 181-185 15 N nuclear magnetic resonance spectroscopy: a powerful tool to study amino acid biosynthesis in higher plants....Pages 187-190 Separation of amino acids by high performance liquid chromatography....Pages 191-195 Glutathione, a tripeptide which may function as a temporary storage compound of excessive reduced sulphur in H 2 S fumigated spinach plants....Pages 197-202 The effect of sulfide in the ambient air on amino acid metabolism of spinach leaves....Pages 203-206 Nitrogen uptake, assimilation and transport in barley in the presence of atmospheric nitrogen dioxide....Pages 207-209 Effect of light quality on the alanine and aspartate aminotransferases in Wolffia arrhiza L.....Pages 211-214 Senescence and nitrogen metabolism in annual plants....Pages 215-218 Water relations of cowpea fruits during development....Pages 219-234 Turnover of peroxisomal proteins: Mechanistic aspects of catalase turnover in greening sunflower cotyledons....Pages 235-238 Influence of partial defoliation of green pepper on the senescence, growth, and nitrate reductase of the remaining leaf....Pages 239-244 Chloroplast lipid constituents from leaves of rape plants as affected by nitrogen....Pages 245-249 Front Matter....Pages 251-257 Interactions between nitrogen and carbon metabolism in a whole plant context....Pages 259-259 Dependence of nitrate reduction on root soluble carbohydrates in wheat seedlings....Pages 261-278 Front Matter....Pages 279-282 Effect of nitrogen nutrition on photosynthetic apparatus of wheat during tillering....Pages 259-259 The distribution of inorganic nitrogen and nitrate assimilation in different regions of a Zea mays leaf....Pages 283-288 A photosynthetic and 15 N investigation of the differential growth response of barley to nitrate, ammonium, and nitrate + ammonium nutrition....Pages 289-294 Nitrate or ammonium nutrition in french bean....Pages 295-300 Modification of 14 C photodistribution into C 4 acids in maize leaves by type of nitrogen supply....Pages 301-303 Refixation of photorespiratory ammonia and the role of alanine in photorespiration: Studies with 15 N....Pages 305-307 Effects of the glutamine synthetase inhibitor methionine sulfoximine on CO 2 fixation in Lemna gibba ....Pages 309-313 Distribution of leaf nitrogen concentration in relation to leaf light exposure in peach tree canopies....Pages 315-318 A simulation model of growth and C and N metabolism in young maize plants....Pages 319-321 Front Matter....Pages 323-327 Nitrogen assimilation in an ecological context....Pages 329-329 Nitrate reduction in the leaves and numbers of nitrifiers in the rhizosphere of Plantago lanceolata growing in two contrasting sites....Pages 331-346 Responses of Plantago species to various exponential addition rates of nitrate: A brief report....Pages 347-350 Growth, ionic balance, proton excretion, and nitrate reductase activity in Alnus and Hippophaë supplied with different sources of nitrogen....Pages 351-353 Effect of nodulation on the nitrate assimilation in vegetative soybean plants....Pages 355-358 Front Matter....Pages 359-363 Quantitative relationships for the dependence of growth rate of arable crops on their nitrogen content, dry weight and aerial environment....Pages 365-365 The course of nitrogen uptake by spring barley from soil and fertilizer nitrogen....Pages 367-387 Nitrogen assimilation in field-grown winter wheat: Direct measurements of nitrate reduction in roots using 15 N....Pages 389-393 Nitrogen redistribution and its loss in wheat....Pages 395-398 Influence of the level of nitrogen application on the carbon and nitrogen distribution in selected wheat varieties....Pages 399-401 Interactions between nitrate uptake and N 2 fixation in white clover....Pages 403-406 Front Matter....Pages 407-410 Accumulation and reduction of nitrate in cereal plants dependent on N supply....Pages 365-365 Supply of soil nitrogen to the plant during the growing season....Pages 411-416 Nitrogen supply from some soil types with various organic-matter treatments....Pages 417-432 Dependence of soil mineral N on N-fertilizer application....Pages 433-437 A kinetic approach to determine mineralisable soil nitrogen....Pages 439-442 Distribution of nitrate, exchangeable and non-exchangeable ammonium in the soil-root interface....Pages 443-446 Fate of sheep urine-N applied to an upland grass sward....Pages 447-450 Means of preventing nitrate accumulation in vegetable and pasture plants....Pages 451-453 Nitrate accumulation in spinach: Uptake and reduction of nitrate during a dark or a ‘low light’ night period....Pages 455-471 The role of nitrate in osmoregulation of Italian ryegrass....Pages 473-476 Does nitrate play a role in osmoregulation?....Pages 477-480 Reduction of the nitrate concentration of lettuce grown in recirculating nutrient solution....Pages 481-484 The effect of nitrogen fertilization on nitrate accumulation and yield of some field vegetables....Pages 485-488 Back Matter....Pages 489-492 ....Pages 493-508