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Title:Soybean Responses to Atmospheric Increases in Carbon Dioxide and Ozone
Author(s):Bordignon, Jose Renato
Doctoral Committee Chair(s):Engeseth, Nicki J.
Department / Program:Food Science and Human Nutrition
Discipline:Food Science and Human Nutrition
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Biology, Plant Physiology
Abstract:Atmospheric concentration of carbon dioxide (CO2) has been increasing steadily since the industrial revolution and is expected to double by the middle of this century. Ozone (O3), a secondary air pollutant, has become an issue in the last decades for its damaging effects on humans as well on animals and plants. The effects of elevated carbon dioxide ([CO 2] = 550 mumol mol-1), ozone ([O3] = 1.2 x ambient) and their combination were evaluated in three soybean cultivars from maturation group (MG) II (Corsoy-79, Dwight and Loda) and three cultivars from MG III (Papa, Pioneer 931315 and Williams), using a FACE (Free Air Concentration Enrichment) facility ( Elevated [CO2] caused an improvement in final plant height and yield components (number of nodes, pods and seeds per plant; seed volume and seed weight), while elevated [O 3] had an opposite effect. Plants grown under elevated [CO2] alone or in combination with elevated [O3] experienced also a delay in senescence and seeds of Loda and Pana demonstrated seed chlorophyll retention at harvest. No changes in seed N or fatty acid content were found due to treatment; however, variation among the years of evaluation was observed. Seed size was strongly correlated to seed C content but not to seed N. Total seed isoflavone content response to treatments was cultivar-dependent, with elevated [CO2] causing an increase in Dwight and Loda and elevated [O 3] causing a decrease in Corsoy and Loda. Isoflavone concentration also varied among the years of evaluation, indicating that other environmental factors influenced plant responses. A reduction in seed Ca and Zn content due to elevated [CO2] and an increase due to elevated [O3 ] was observed in most cultivars evaluated. Results presented also demonstrate that elevated [CO2] mitigates the damages caused by elevated [O 3].
Issue Date:2007
Description:213 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
Other Identifier(s):(MiAaPQ)AAI3269847
Date Available in IDEALS:2015-09-25
Date Deposited:2007

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