Elevated CO2 alters grain quality of two bread wheat cultivars grown under different environmental conditions
Article
Article Title | Elevated CO2 alters grain quality of two bread wheat cultivars grown under different environmental conditions |
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ERA Journal ID | 36361 |
Article Category | Article |
Authors | Fernando, Nimesha (Author), Panozzo, Joe (Author), Tausz, Michael (Author), Norton, Robert M. (Author), Neumann, Nathan (Author), Fitzgerald, Glenn J. (Author) and Seneweera, Saman (Author) |
Journal Title | Agriculture, Ecosystems and Environment |
Journal Citation | 185, pp. 24-33 |
Number of Pages | 10 |
Year | 2014 |
Publisher | Elsevier |
Place of Publication | Amsterdam, Netherlands |
ISSN | 0167-8809 |
1873-2305 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.agee.2013.11.023 |
Abstract | Bread wheat (Triticum aestivum L. cv. Yitpi and cv. Janz) was grown under field conditions in the Australian Grains Free-Air CO2 Enrichment (AGFACE) facility. Ambient [CO2] (a[CO2], ~384μmolmol-1) and elevated [CO2] (e[CO2], ~550μmolmol-1) were combined with two soil water levels (rain-fed and irrigated) and two times of sowing (TOS) in three consecutive years to provide six environments (2007-TOS1, 2007-TOS2, 2008-TOS1, 2008-TOS2, 2009-TOS1, 2009-TOS2). Grain samples were assessed for a range of physical, nutritional and dough rheological properties. The effect of e[CO2] on thousand grain weight (TGW) was significantly different in each growing environment: TGW was significantly increased under e[CO2] only at 2007-TOS2 (by 5%), 2009-TOS1 (by 5%) and 2009-TOS2 (by 15%) but not significantly changed under other conditions. The magnitude of reduction of grain protein concentration at e[CO2] differed among the growing environments but was highly correlated with the percentage yield stimulation under e[CO2] (r2=0.91) suggesting that grain protein concentration under e[CO2] was diluted by increased yield. Across all treatments, grain nutrient concentration was significantly reduced by e[CO2] for Fe (3.9%, 6.2%), Cu (2.2%, 3.4%), Zn (5.9%, 5.7%), Ca (5.6%, 7.3%), Mg (5.6%, 5.8%), Na (21.2%, 30.4%), S (4.4%, 4.4%), P (4.1%, 3.2%) in cv. Yitpi and Janz, respectively. Effects of e[CO2] on grain Zn, Mg and Na concentrations were dependent on the growing environment. Relative reduction of grain S, Fe, Mg, Zn, P at e[CO2] were significantly correlated with grain yield stimulation at e[CO2]. Reductions of these nutrients under e[CO2] were not fully explained by biomass dilution as the relationships differed for each nutrient. Under e[CO2], flour yield of cv. Janz was increased but that of cv. Yitpi was not changed. Even though grain protein concentrations of both cultivars were similar at e[CO2], bread volume as inferred indirectly by dough rheology parameters was 12% greater for cv. Janz (185±5cm3) than cv. Yitpi (162±4cm3) at e[CO2]. This disparity may be related to the compositional changes in wheat flour protein at e[CO2], suggesting that future breeding and adaptation strategies to improve the grain quality under e[CO2] should consider the prevailing hydro-thermal conditions. |
Keywords | elevated CO2; wheat; climate change; grain quality; protein; micro nutrient; bread quality; dough rheological properties; grain minerals |
ANZSRC Field of Research 2020 | 310806. Plant physiology |
410203. Ecosystem function | |
410102. Ecological impacts of climate change and ecological adaptation | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Melbourne |
Department of Environment and Primary Industries, Victoria | |
International Plant Nutrition Institute, Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2659/elevated-co2-alters-grain-quality-of-two-bread-wheat-cultivars-grown-under-different-environmental-conditions
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