Elevated Ozone Concentration Reduces Photosynthetic Carbon Gain but Does Not Alter Leaf Structural Traits, Nutrient Composition or Biomass in Switchgrass
2019
Li, Shuai | Courbet, Galatéa | Ourry, Alain, A. | Ainsworth, Elizabeth | Bureau de Recherches Géologiques et Minières (BRGM) | Ecophysiologie Végétale, Agronomie et Nutritions (EVA) ; Université de Caen Normandie (UNICAEN) ; Normandie Université (NU)-Normandie Université (NU)-Institut National de la Recherche Agronomique (INRA)
International audience
Mostrar más [+] Menos [-]Inglés. Elevated tropospheric ozone concentration (O3) increases oxidative stress in vegetationand threatens the stability of crop production. Current O3 pollution in the United States isestimated to decrease the yields of maize (Zea mays) up to 10%, however, many bioenergy feedstocksincluding switchgrass (Panicum virgatum) have not been studied for response to O3 stress. UsingFree Air Concentration Enrichment (FACE) technology, we investigated the impacts of elevatedO3 (~100 nmol mol−1) on leaf photosynthetic traits and capacity, chlorophyll fluorescence, theBall–Woodrow–Berry (BWB) relationship, respiration, leaf structure, biomass and nutrient compositionof 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 functionaland structural traits in switchgrass or the macro- (except potassium) and micronutrient content ofleaves. These results suggest that switchgrass exhibits a greater O3 tolerance than maize, and provideimportant fundamental data for evaluating the yield stability of a bioenergy feedstock crop and forexploring O3 sensitivity among bioenergy feedstocks.
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