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Response of sugar beet ( Beta vulgaris L.) yield and biochemical composition to elevated CO 2 and temperature at two nitrogen applications
Author(s) -
DemmersDerks H.,
Mitchell R. A. C.,
Mitchell V. J.,
Lawlor D. W.
Publication year - 1998
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1998.00327.x
Subject(s) - sugar beet , nitrogen , chemistry , zoology , dry weight , sugar , amino acid , horticulture , food science , biology , biochemistry , organic chemistry
Effects on sugar beet ( Beta vulgaris L.) of current and elevated CO 2 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 CO 2 (600 μ mol mol –1 in 1993 and 700 μ mol 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 CO 2 on total or root dry mass. Neither elevated CO 2 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 CO 2 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.