Effects of elevated CO/sub 2/ and nutrient stress on nitrogen and phosphorus uptake and use efficiencies
Earlier they reported that non-nodulating Lee soybeans growing in complete nutrient solution showed decreased nutrient uptake efficiency (mg N or P/g root) at early pod fill when exposed to elevated CO/sub 2/. In order to look at CO/sub 2//nutrient interactions over time, plants were grown in growth chambers with nutrient solutions containing 10 mM N/1 mM P (controls) or 10 mM N/0.1 mM P (low P) or 0.5 mM N/1 mMP (low N) and exposed to either 350 or 700 ..mu..L/L CO/sub 2/. Uptake efficiencies for N and P of the control plants showed a pronounced positive response to high CO/sub 2/ in early growth stages, which diminished with time and then became negative. This trend was also present for the low N and low P plants. Nutrient use efficiency, however, was increased by day 7 (first harvest) by high CO/sub 2/ and the effect was sustained through the vegetative period. The N and P stresses produced contrasting responses: low P availability caused an increase in P use efficiency, whereas low N caused a decrease in N use efficiency. These effects resulted from P uptake beyond the requirement for growth, a pattern not observed for N uptake.
- Research Organization:
- Duke Univ., Durham, NC
- OSTI ID:
- 5954677
- Report Number(s):
- CONF-8707108-
- Journal Information:
- Plant Physiol., Suppl.; (United States), Vol. 83:4; Conference: Annual meeting of the American Society of Plant Physiologists, St. Louis, MO, USA, 19 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
CARBON DIOXIDE
TOXICITY
NITROGEN
NUTRITIONAL DEFICIENCY
PHOSPHORUS
BIOLOGICAL STRESS
EFFICIENCY
GLYCINE HISPIDA
NUTRITION
PLANT GROWTH
ROOT ABSORPTION
ABSORPTION
BACTERIA
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
GROWTH
LEGUMINOSAE
MICROORGANISMS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLANTS
RHIZOBIUM
UPTAKE
560300* - Chemicals Metabolism & Toxicology
551000 - Physiological Systems