PSII photochemistry and carboxylation efficiency in Liriodendron tulipifera under ozone exposure |
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| Institution: | 1. College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China;2. State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi 712100, China;1. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, United States;2. National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305, United States;3. University of Virginia, 376 Clark Hall, 291 McCormick Rd, Charlottesville, VA 22904, United States;4. USDA Forest Service, Rocky Mountain Research Station 240 West Prospect, Fort Collins, CO 8056, United States;5. Colorado State University, 1787 Campus Delivery, CSU, Fort Collins, CO 80525, United States;1. U.S. Geological Survey, Geosciences and Environmental Change Science Center, Denver, CO, United States;2. USDA Forest Service, Rocky Mountain Research Station, 240 West Prospect, Fort Collins, CO 80526, United States;3. Colorado State University, Natural Resource Ecology Laboratory, Fort Collins, CO 80524, United States;1. Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, 6339 Stores Road, Vancouver, BC, Canada V6T 1Z4;2. Department of Geography, The University of British Columbia, 1984 West Mall, Vancouver, BC, Canada V6T 1Z2;3. Faculty of Land and Food Systems, The University of British Columbia, 2357 Main Mall, Vancouver, BC, Canada V6T 1Z4;4. Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, BC, Canada V2N 4Z9;1. W.A. Franke College of Forestry and Conservation, University of Montana, 32 Campus Drive, Missoula, MT 59812, USA;2. USDA Forest Service, Rocky Mountain Research Station, Fire, Fuel, and Smoke Science Program, Missoula, MT 59808, USA |
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| Abstract: | Liriodendron tulipifera is an important forest plant which is commonly used in urban environments as a shade tree. Young plants have been exposed (under controlled conditions) to 120 ppb of O3 for 45 consecutive days (5 h d−1). The aim of this investigation was to clarify if O3 limits the physiological performance of L. tulipifera. In treated plants, dynamics related to membrane injury, gas exchange and chlorophyll a fluorescence leads to: (i) increase in lipid peroxidation (maximum value of +78% 15 days after the fumigation, compared to controls); (ii) reduction of photosynthetic activity (up to 66% 28 days after the exposure), twinned with a partial stomatal closure and a store of CO2 in substomatal chambers; (iii) reduction in carboxylation efficiency (−11% at the end of exposure); (iv) damage to PSII, as demonstrated by the increase in the PSII excitation pressure (−57% 28 days after the treatment). On this basis, O3 should be considered very harmful to L. tulipifera, although the reduction of total chlorophylls content and the activation of xanthophyll cycle take place in order to attempt to regulate light absorbed energy limiting oxidative damage. |
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