Photosynthesis and conductance of spring-wheat leaves:: field response to continuous free-air atmospheric CO2 enrichment

被引:102
作者
Garcia, RL
Long, SP
Wall, GW
Osborne, CP
Kimball, BA
Nie, GY
Pinter, PJ
Lamorte, RL
Wechsung, F
机构
[1] LI Cor Inc, Environm Div, Lincoln, NE 68504 USA
[2] Univ Essex, John Tabor Labs, Dept Biol Sci, Colchester CO4 3SQ, Essex, England
[3] Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA
[4] USDA ARS, US Water Conservat Lab, Phoenix, AZ 85040 USA
[5] Potsdam Inst Climate Impact Res, Nat Syst Dept, D-11412 Potsdam, Germany
关键词
acclimation; atmospheric change; climate change; elevated carbon dioxide; FACE; phenology; photosynthesis; Rubisco; stomatal conductance;
D O I
10.1046/j.1365-3040.1998.00320.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Spring wheat was grown from emergence to grain maturity in two partial pressures of CO2 (pCO(2)): ambient air of nominally 37 Pa and air enriched with CO2 to 55 Pa using a free-air CO2 enrichment (FACE) apparatus. This experiment was the first of its kind to be conducted within a cereal field without the modifications or disturbance of microclimate and rooting environment that accompanied previous studies, It provided a unique opportunity to examine the hypothesis that continuous exposure of wheat to elevated pCO(2) will lead to acclimatory loss of photosynthetic capacity. The diurnal courses of photosynthesis and conductance for upper canopy leaves were followed throughout the development of the crop and compared to model-predicted rates of photosynthesis. The seasonal average of midday photosynthesis rates was 28% greater in plants exposed to elevated pCO(2) than in contols and the seasonal average of the daily integrals of photosynthesis was 21% greater in elevated pCO(2) than in ambient air. The mean conductance at midday was reduced by 36%. The observed enhancement of photosynthesis in elevated pCO(2) agreed closely with that predicted from a mechanistic biochemical model that assumed no acclimation of photosynthetic capacity. Measured values fell below predicted only in the flag leaves in the mid afternoon before the onset of grain-filling and over the whole diurnal course at the end of grain-filling. The loss of enhancement at this final stage was attributed to the earlier senescence of flag leaves in elevated pCO(2). In contrast to some controlled-environment and field-enclosure studies, this field-scale study of wheat using free-air CO2 enrichment found little evidence of acclimatory loss of photosynthetic capacity with growth in elevated pCO(2) and a significant and substantial increase in leaf photosynthesis throughout the life of the crop.
引用
收藏
页码:659 / 669
页数:11
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