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

Fernando, N. and Panozzo, J. and Tausz, M. and et al, . (2012) Wheat grain quality under increasing atmospheric CO2 concentrations in a semi-arid cropping system. Journal of Cereal Science, 56. pp. 684-690.

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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.

Item Type: Article
Additional Information: Research at the AGFACE facility is jointly run by the Victorian State Government Department of Primary Industries and the University of Melbourne, with crucial additional funding by the Grains Research and Development Corporation and the Australian Commonwealth Department of Agriculture, Fisheries and Forestry. Additional support by the International Plant Nutrition Institute is gratefully acknowledged. We thank Mahabubur Mollah, Russel Argall, Peter Howie, Nathan Neumann and Dileepa Jayaweera for their support in various stages of the experiment. We also thank Victor Raboy, United States Department of Agriculture for assistance with the phytate measurements.
Author Affiliation: The University of Melbourne, Natimuk Road, Private Box 260, Horsham, Victoria 3401, Australia,
Subjects: Crop Improvement
Environmental Science
Divisions: General
Depositing User: Mr. SanatKumar Behera
Date Deposited: 02 Dec 2012 12:09
Last Modified: 02 Dec 2012 12:09
Official URL: http://dx.doi.org/10.1016/j.jcs.2012.07.010
URI: http://eprints.icrisat.ac.in/id/eprint/8953

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