Wheat grain quality under increasing atmospheric CO2 concentrations in a semi-arid cropping system

Fernando, Nimesha and Panozzo, Joe and Tausz, Michael and Norton, Robert M. and Fitzgerald, Glenn J. and Myers, Samuel and Walker, Cassandra and Stangoulis, James and Seneweera, Saman (2012) Wheat grain quality under increasing atmospheric CO2 concentrations in a semi-arid cropping system. Journal of Cereal Science, 56 (3). pp. 684-690. ISSN 0733-5210


We investigated wheat (Triticum aestivum) grain quality under Free Air CO2 Enrichment (FACE) of 550 ± 10% CO2 μmol mol -1. In each of two full growing seasons (2008 and 2009), two times of sowing were compared, with late sowing designed to mimic high temperature during grain filling. Grain samples were subjected to a range of physical, nutritional and rheological quality assessments. Elevated CO2 increased thousand grain weight (8%) and grain diameter (5%). Flour protein concentration was reduced by 11% at e[CO2], with the highest reduction being observed at the late time of sowing in 2009, (15%). Most of the grain mineral concentrations decreased under e[CO2] - Ca (11%), Mg (7%), P (11%) and S (7%), Fe (10%), Zn (17%), Na (19%), while total uptake of these nutrients per unit ground area increased. Rheological properties of the flour were altered by e[CO2] and bread volume reduced by 7%. Phytate concentration in grains tended to decrease (17%) at e[CO2] while grain fructan concentration remained unchanged. The data suggest that rising atmospheric [CO2] will reduce the nutritional and rheological quality of wheat grain, but at high temperature, e[CO2] effects may be moderated. Reduced phytate concentrations at e[CO2] may improve bioavailability of Fe and Zn in wheat grain.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Elsevier Ltd. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 01 Jul 2014 02:54
Last Modified: 22 Mar 2017 01:47
Uncontrolled Keywords: bread quality; free-air carbon dioxide enrichment; FACE; grain quality; nutrient and anti-nutrient factors
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
04 Earth Sciences > 0401 Atmospheric Sciences > 040101 Atmospheric Aerosols
05 Environmental Sciences > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960304 Climate Variability (excl. Social Impacts)
Identification Number or DOI: 10.1016/j.jcs.2012.07.010
URI: http://eprints.usq.edu.au/id/eprint/25398

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