Response of sugar beet (Beta vulgaris L.) yield and biochemical composition to elevated CO2 and temperature at two nitrogen applications

• Published in: Plant, cell and environment Vol. 21; no. 8; pp. 829 - 836
• Main Authors: Demmers‐Derks, H., Mitchell, R. A. C., Mitchell, V. J., Lawlor, D. W.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 01-08-1998; Blackwell
• Subjects: Agricultural and forest climatology and meteorology. Irrigation. Drainage; Agricultural and forest meteorology; Agronomy. Soil science and plant productions; Beta vulgaris; Biological and medical sciences; biomass; Climatic adaptation. Acclimatization; CO2; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; nitrogen; root quality; sugar beet; temperature; yield; Nitrogen fertilization; Temperature; Sucrose; Carbon dioxide; Osmoregulation; Environmental factor; Beta vulgaris var. saccharata; Glycine; Sugar plant; Chenopodiaceae; Dose activity relation; Medium enrichment; Betaine; Dicotyledones; Angiospermae; Spermatophyta; Chemical composition; Yield component
• ISSN: 0140-7791; 1365-3040
• DOI: 10.1046/j.1365-3040.1998.00327.x

Effects on sugar beet (Beta vulgaris L.) of current and elevated CO2 and temperature alone and in combination and their interactions with abundant and deficient nitrogen supply (HN and LN, respectively) have been studied in three experiments in 1993, 1994 and 1995. Averaged over all experiments, elevated CO2 (600 μmol mol–1 in 1993 and 700 μmol mol–1 in 1994 and 1995) increased total dry mass at final harvest by 21% (95% confidence interval (CI) = 21, 22) and 11% (CI = 6, 15) and root dry mass by 26% (CI = 19, 32) and 12% (CI = 6, 18) for HN and LN plants, respectively. Warmer temperature decreased total dry mass by 11% (CI = – 15, – 7) and 9% (CI = – 15, – 5) and root dry mass by 7% (CI = – 12, – 2) and 7% (CI = – 10, 0) for HN and LN plants, respectively. There was no significant interaction between temperature and CO2 on total or root dry mass. Neither elevated CO2 nor temperature significantly affected sucrose concentration per unit root dry mass. Concentrations of glycinebetaine and of amino acids, measured as α‐amino‐N, decreased in elevated CO2 in both N applications; glycinebetaine by 13% (CI = – 21, – 5) and 16% (CI = – 24, – 8) and α‐amino‐N by 24% (CI = – 36, – 11) and 16% (CI = – 26, – 5) for HN and LN, respectively. Warmer temperature increased α‐amino‐N, by 76% (CI = 50, 107) for HN and 21% (CI = 7, 36) for LN plants, but not glycinebetaine.