TY - JOUR
T1 - Elevated Ozone Concentration Reduces Photosynthetic Carbon Gain but Does Not Alter Leaf Structural Traits, Nutrient Composition or Biomass in Switchgrass
AU - Li, Shuai
AU - Courbet, Galatéa
AU - Ourry, Alain
AU - Ainsworth, Elizabeth
N1 - Funding Information:
Acknowledgements: We would like to thank Jesse McGrath, Chris Moller, Noah Mitchell and Aidan McMahon for technical and field assistance. We also would like to thank Prof. DoKyoung Lee (University of Illinois at Urbana-Champaign) for providing plant materials. The authors acknowledge the PLATIN’ (Plateau d’Isotopie de Normandie) core facility for the nutrient and isotope analysis used in this study. This work was funded by the DOE Center for Advanced Bioenergy and Bioproducts Innovation (U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research under Award Number DE-SC0018420).
Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/4/2
Y1 - 2019/4/2
N2 - Elevated tropospheric ozone concentration (O3) increases oxidative stress in vegetation and threatens the stability of crop production. Current O3 pollution in the United States is estimated to decrease the yields of maize (Zea mays) up to 10%, however, many bioenergy feedstocks including switchgrass (Panicum virgatum) have not been studied for response to O3 stress. Using Free Air Concentration Enrichment (FACE) technology, we investigated the impacts of elevated O3 (~100 nmol mol− 1) on leaf photosynthetic traits and capacity, chlorophyll fluorescence, the Ball–Woodrow–Berry (BWB) relationship, respiration, leaf structure, biomass and nutrient composition of switchgrass. Elevated O3 concentration reduced net CO2 assimilation rate (A), stomatal conductance (gs), and maximum CO2 saturated photosynthetic capacity (Vmax), but did not affect other functional and structural traits in switchgrass or the macro- (except potassium) and micronutrient content of leaves. These results suggest that switchgrass exhibits a greater O3 tolerance than maize, and provide important fundamental data for evaluating the yield stability of a bioenergy feedstock crop and for exploring O3 sensitivity among bioenergy feedstocks.
AB - Elevated tropospheric ozone concentration (O3) increases oxidative stress in vegetation and threatens the stability of crop production. Current O3 pollution in the United States is estimated to decrease the yields of maize (Zea mays) up to 10%, however, many bioenergy feedstocks including switchgrass (Panicum virgatum) have not been studied for response to O3 stress. Using Free Air Concentration Enrichment (FACE) technology, we investigated the impacts of elevated O3 (~100 nmol mol− 1) on leaf photosynthetic traits and capacity, chlorophyll fluorescence, the Ball–Woodrow–Berry (BWB) relationship, respiration, leaf structure, biomass and nutrient composition of switchgrass. Elevated O3 concentration reduced net CO2 assimilation rate (A), stomatal conductance (gs), and maximum CO2 saturated photosynthetic capacity (Vmax), but did not affect other functional and structural traits in switchgrass or the macro- (except potassium) and micronutrient content of leaves. These results suggest that switchgrass exhibits a greater O3 tolerance than maize, and provide important fundamental data for evaluating the yield stability of a bioenergy feedstock crop and for exploring O3 sensitivity among bioenergy feedstocks.
KW - Biomass
KW - Chlorophyll fluorescence
KW - Leaf anatomy
KW - Ozone
KW - Photosynthesis
KW - Stomatal conductance
KW - Switchgrass
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U2 - 10.3390/plants8040085
DO - 10.3390/plants8040085
M3 - Article
C2 - 30987071
SN - 2223-7747
VL - 8
JO - Plants
JF - Plants
IS - 4
M1 - 85
ER -