Can a wheat cultivar with high transpiration efficiency maintain its yield advantage over a near-isogenic cultivar under elevated CO2?

Tausz-Posch, Sabine and Seneweera, Saman and Norton, Robert M. and Fitzgerald, Glenn J. and Tausz, Michael (2012) Can a wheat cultivar with high transpiration efficiency maintain its yield advantage over a near-isogenic cultivar under elevated CO2? Field Crops Research, 133. pp. 160-166. ISSN 0378-4290


This study investigated whether yield advantages of the wheat cultivar 'Drysdale' (selected for high transpiration efficiency) over recurrent parent 'Hartog' (low transpiration efficiency) are maintained under future atmospheric CO2. Growth, yield and yield components at three developmental stages (stem elongation, anthesis, maturity) were evaluated at two CO2 concentrations (ambient, a[CO2], ~390μmolmol -1 and elevated, e[CO2], ~550μmolmol -1). Growth under e[CO2] stimulated yield and above ground biomass on average by ~18%. 'Hartog' compared to 'Drysdale' had significantly greater crop growth rate (~14%), above ground biomass (~15%), leaf area index (~25%) and tiller numbers (~16%) during early development (stem elongation). 'Hartog', however, lost this initial growth advantage over 'Drysdale' until anthesis when 'Drysdale' had more green leaf mass (~15%) and greater spike (~8%) and tiller (~11%) numbers, particularly when grown under e[CO2]. At maturity, this resulted in a yield advantage of ~19% of 'Drysdale' over 'Hartog' when grown under e[CO2] but only of ~2% under a[CO2]. We suggest that wheat cultivars selected for superior transpiration efficiency will remain successful in a high [CO2] world. Evidence from this study even indicates that such cultivars may confer future advantage in some environments where this is not evident under current [CO2].

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2012 Elsevier B.V. Permanent restricted access to published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 01 Jul 2014 05:16
Last Modified: 22 Mar 2017 01:48
Uncontrolled Keywords: climate change; free air carbon dioxide enrichment; FACE; Triticum aestivum L.
Fields of Research : 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
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
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: 10.1016/j.fcr.2012.04.007

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