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Registro Completo |
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
05/09/2007 |
Data da última atualização: |
21/07/2008 |
Autoria: |
BORDIGNON, J. R. |
Título: |
Soybean responses to atmospheric increases in carbon dioxide (CO2) and ozone (O3). |
Ano de publicação: |
2006 |
Fonte/Imprenta: |
2006. |
Páginas: |
213 f. |
Idioma: |
Inglês |
Notas: |
Dissertation (Doctor in Philosophy in Food Science and Human Nutrition) - University of Illinois at Urbana-Champaing. |
Conteúdo: |
Atmospheric concentration of carbon dioxide (CO) has been increasing steadily since the industrial revolution and is expected to double by the middle of this century. Ozone (03), a secondary air pollutant, has become an issue in the last decades for its damaging effects on humans as well on animaIs and plants. The effects of elevated carbon dioxide ([CO2] = 550 µmol mol -¹ ozone ([03] = 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 (Pana, Pioneer 93B15 and Williams), using a FACE (Free Air Concentration Enrichment) facility (www.soyface.uiuc.edu). 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 [03] had an opposite effect. Plants grown under elevated [CO2] alone or in combination with elevated [03] 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 cultivardependent, with elevated [CO2] causing an increase in Dwight and Loda and elevated [03] 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 [03] was observed in most cultivars evaluated. Results presented aIs o demonstrate that elevated [CO2] mitigates the damages caused by elevated [03]. MenosAtmospheric concentration of carbon dioxide (CO) has been increasing steadily since the industrial revolution and is expected to double by the middle of this century. Ozone (03), a secondary air pollutant, has become an issue in the last decades for its damaging effects on humans as well on animaIs and plants. The effects of elevated carbon dioxide ([CO2] = 550 µmol mol -¹ ozone ([03] = 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 (Pana, Pioneer 93B15 and Williams), using a FACE (Free Air Concentration Enrichment) facility (www.soyface.uiuc.edu). 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 [03] had an opposite effect. Plants grown under elevated [CO2] alone or in combination with elevated [03] 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 cultivardependent, with elevated [CO2] causing an increase in Dwight and Loda and elevated [03] causing a decrease in Corsoy and Loda. Isoflavone concentration also v... Mostrar Tudo |
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LEADER 02307nam a2200133 a 4500 001 1454303 005 2008-07-21 008 2006 bl uuuu m 00u1 u #d 100 1 $aBORDIGNON, J. R. 245 $aSoybean responses to atmospheric increases in carbon dioxide (CO2) and ozone (O3). 260 $a2006.$c2006 300 $a213 f. 500 $aDissertation (Doctor in Philosophy in Food Science and Human Nutrition) - University of Illinois at Urbana-Champaing. 520 $aAtmospheric concentration of carbon dioxide (CO) has been increasing steadily since the industrial revolution and is expected to double by the middle of this century. Ozone (03), a secondary air pollutant, has become an issue in the last decades for its damaging effects on humans as well on animaIs and plants. The effects of elevated carbon dioxide ([CO2] = 550 µmol mol -¹ ozone ([03] = 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 (Pana, Pioneer 93B15 and Williams), using a FACE (Free Air Concentration Enrichment) facility (www.soyface.uiuc.edu). 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 [03] had an opposite effect. Plants grown under elevated [CO2] alone or in combination with elevated [03] 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 cultivardependent, with elevated [CO2] causing an increase in Dwight and Loda and elevated [03] 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 [03] was observed in most cultivars evaluated. Results presented aIs o demonstrate that elevated [CO2] mitigates the damages caused by elevated [03].
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