Effects of elevated CO2 , nitrogen form and concentration on growth and photosynthesis of a fast- and slow-growing grass

The New Phytologist
J M Bowler, M C Press

Abstract

Growth and photosynthesis of Agrostis capillaris L. and Nardus stricta L. were measured for plants grown under ambient and elevated concentrations of CO2 (340 and 550 μl CO2 l(-1) respectively) and a range of nitrogen concentrations (0.01, 0.1, 1 and 5 mg N l(-1) ) supplied as either ammonium sulphate or sodium nitrate. After 42 d of growth for A. capillaris and 49 d of growth for N. stricta, the higher nitrogen concentrations resulted in stimulation of growth. The form of nitrogen did not affect the total dry weight attained by A. capillaris. However, ammonium-grown N. stricta attained a greater total dry weight than did nitrate-grown plants. Nitrogen form influenced leaf area ratio, which was greater in nitrate-grown A. capillaris and in ammonium-grown N. stricta. At the two lowest nitrogen concentrations there was no effect of elevated CO2 on total dry weight in either species, whilst at the two highest nitrogen concentrations positive growth responses to elevated C02 were observed. Photosynthetic capacity and carboxylation efficiency were lower in plants grown in elevated CO2 at the two lowest nitrogen concentrations, and were associated with greater leaf soluble carbohydrate content and lower foliar nitrogen concentrations...Continue Reading

References

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Citations

Jul 29, 2000·Biochemical Systematics and Ecology· Martijn Bezemer T E Newington J
Oct 1, 2015·Journal of the American Chemical Society·Xiao HuaClare P Grey
May 14, 2016·The Journal of Physical Chemistry. a·Giel MullerGiovanni Meloni
Jun 8, 2007·Journal of Pharmacokinetics and Pharmacodynamics·Luis Marcelo Pereira
Apr 3, 1999·Toxicology and Industrial Health·P Short, T Colborn
Oct 29, 2018·Protoplasma·Karl J NiklasStuart A Newman
Jul 21, 2020·Journal of Experimental Botany·Guillaume TcherkezIker Aranjuelo

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