DOI: 10.1111/gcb.13013
论文题名: Canopy warming caused photosynthetic acclimation and reduced seed yield in maize grown at ambient and elevated [CO2]
作者: Ruiz-Vera U.M. ; Siebers M.H. ; Drag D.W. ; Ort D.R. ; Bernacchi C.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 11 起始页码: 4237
结束页码: 4249
语种: 英语
英文关键词: Elevated CO2
; Free-air CO2 enrichment
; Global warming
; Maize
; Photosynthesis
; Yields
Scopus关键词: acclimation
; canopy architecture
; carbon dioxide enrichment
; climate change
; climate effect
; crop yield
; global change
; growth response
; photosynthesis
; seed production
; warming
; Zea mays
; carbon dioxide
; acclimatization
; growth, development and aging
; heat
; Illinois
; maize
; metabolism
; photosynthesis
; physiology
; plant seed
; Acclimatization
; Carbon Dioxide
; Hot Temperature
; Illinois
; Photosynthesis
; Seeds
; Zea mays
英文摘要: Rising atmospheric CO2 concentration ([CO2]) and attendant increases in growing season temperature are expected to be the most important global change factors impacting production agriculture. Although maize is the most highly produced crop worldwide, few studies have evaluated the interactive effects of elevated [CO2] and temperature on its photosynthetic physiology, agronomic traits or biomass, and seed yield under open field conditions. This study investigates the effects of rising [CO2] and warmer temperature, independently and in combination, on maize grown in the field throughout a full growing season. Free-air CO2 enrichment (FACE) technology was used to target atmospheric [CO2] to 200 μmol mol-1 above ambient [CO2] and infrared heaters to target a plant canopy increase of 3.5 °C, with actual season mean heating of ~2.7 °C, mimicking conditions predicted by the second half of this century. Photosynthetic gas-exchange parameters, leaf nitrogen and carbon content, leaf water potential components, and developmental measurements were collected throughout the season, and biomass and yield were measured at the end of the growing season. As predicted for a C4 plant, elevated [CO2] did not stimulate photosynthesis, biomass, or yield. Canopy warming caused a large shift in aboveground allocation by stimulating season-long vegetative biomass and decreasing reproductive biomass accumulation at both CO2 concentrations, resulting in decreased harvest index. Warming caused a reduction in photosynthesis due to down-regulation of photosynthetic biochemical parameters and the decrease in the electron transport rate. The reduction in seed yield with warming was driven by reduced photosynthetic capacity and by a shift in aboveground carbon allocation away from reproduction. This field study portends that future warming will reduce yield in maize, and this will not be mitigated by higher atmospheric [CO2] unless appropriate adaptation traits can be introduced into future cultivars. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61934
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant Biology, University of Illinois Urbana-Champaign, Urbana, IL, United States; Global Change and Photosynthesis Research Unit, USDA-ARS, 1201 W. Gregory Drive, 196 ERML, Urbana, IL, United States
Recommended Citation:
Ruiz-Vera U.M.,Siebers M.H.,Drag D.W.,et al. Canopy warming caused photosynthetic acclimation and reduced seed yield in maize grown at ambient and elevated [CO2][J]. Global Change Biology,2015-01-01,21(11)