DOI: 10.1111/gcb.12091
论文题名: Photosynthetic acclimation and resource use by the C3 and C4 subspecies of Alloteropsis semialata in low CO2 atmospheres
作者: Ripley B.S. ; Cunniff J. ; Osborne C.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 3 起始页码: 900
结束页码: 910
语种: 英语
英文关键词: Acclimation
; Biomass partitioning
; C3 photosynthesis
; C4 photosynthesis
; Nutrient limitation
; Subambient CO2
Scopus关键词: carbon dioxide
; nitrogen
; acclimation
; biomass allocation
; C3 plant
; C4 plant
; carbon dioxide
; efficiency measurement
; glacial-interglacial cycle
; interglacial
; nitrogen
; parameterization
; photosynthesis
; resource use
; stomatal conductance
; adaptation
; article
; biomass
; chemistry
; photosynthesis
; physiology
; Poaceae
; Adaptation, Physiological
; Biomass
; Carbon Dioxide
; Nitrogen
; Photosynthesis
; Poaceae
; Alloteropsis semialata
英文摘要: During the past 25 Myr, partial pressures of atmospheric CO2 (Ca) imposed a greater limitation on C3 than C4 photosynthesis. This could have important downstream consequences for plant nitrogen economy and biomass allocation. Here, we report the first phylogenetically controlled comparison of the integrated effects of subambient Ca on photosynthesis, growth and nitrogen allocation patterns, comparing the C3 and C4 subspecies of Alloteropsis semialata. Plant size decreased more in the C3 than C4 subspecies at low Ca, but nitrogen pool sizes were unchanged, and nitrogen concentrations increased across all plant partitions. The C3, but not C4 subspecies, preferentially allocated biomass to leaves and increased specific leaf area at low Ca. In the C3 subspecies, increased leaf nitrogen was linked to photosynthetic acclimation at the interglacial Ca, mediated via higher photosynthetic capacity combined with greater stomatal conductance. Glacial Ca further increased the biochemical acclimation and nitrogen concentrations in the C3 subspecies, but these were insufficient to maintain photosynthetic rates. In contrast, the C4 subspecies maintained photosynthetic rates, nitrogen- and water-use efficiencies and plant biomass at interglacial and glacial Ca with minimal physiological adjustment. At low Ca, the C4 carbon-concentrating mechanism therefore offered a significant advantage over the C3 type for carbon acquisition at the whole-plant scale, apparently mediated via nitrogen economy and water loss. A limiting nutrient supply damped the biomass responses to Ca and increased the C4 advantage across all Ca treatments. Findings highlight the importance of considering leaf responses in the context of the whole plant, and show that carbon limitation may be offset at the expense of greater plant demand for soil resources such as nitrogen and water. Results show that the combined effects of low CO2 and resource limitation benefit C4 plants over C3 plants in glacial-interglacial environments, but that this advantage is lessened under anthropogenic conditions. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62502
Appears in Collections: 影响、适应和脆弱性
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作者单位: Botany Department, Rhodes University, PO Box 94, Grahamstown 6140, South Africa; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, United Kingdom
Recommended Citation:
Ripley B.S.,Cunniff J.,Osborne C.P.. Photosynthetic acclimation and resource use by the C3 and C4 subspecies of Alloteropsis semialata in low CO2 atmospheres[J]. Global Change Biology,2013-01-01,19(3)