Journal article

Does a freely tillering wheat cultivar benefit more from elevated CO2 than a restricted tillering cultivar in a water-limited environment?

Sabine Tausz-Posch, Raymond W Dempsey, Saman Seneweera, Robert M Norton, Glenn Fitzgerald, Michael Tausz



This study addresses whether a freely tillering wheat cultivar with greater vegetative sink strength (cv. “Silverstar”) can benefit more from increasing atmospheric CO2 concentration [CO2] than a restricted tillering cultivar with greater reproductive sink strength (cv. H45) in a water-limited cropping system. Growth, yield, yield components and nitrogen at three developmental stages (stem elongation, anthesis, maturity) and water soluble carbohydrates (WSC, anthesis) were evaluated at two CO2 concentrations (ambient [CO2], ∼395ppm, elevated e[CO2], ∼550ppm) across six environments using the Australian Grains Free Air CO2 Enrichment (AGFACE) facility. Cv. “Silverstar” had more tillers than c..

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Funding Acknowledgements

This research received support from the Australian Commonwealth Department of Agriculture and the Grains Research and Development Corporation (GRDC). Research at the Australian Grains Free Air CO<INF>2</INF> Enrichment (AGFACE) facility is jointly run by the Victorian State Department of Environment and Primary Industries (VicDEPI) and The University of Melbourne. We gratefully acknowledge Mahabubur Mollah (Senior Research Engineer, VicDEPI) in operating the CO<INF>2</INF> enrichment facility. Russel Argall (Senior Technical Officer) and his field team were central in running the field experiments. We gratefully acknowledge help with sample processing by Peter Howie (Technical Officer, University of Melbourne) and Nimesha Fernando, Lakmini Thilakarathne, and Raymond Lam (research students at the University of Melbourne). Camille Durant, Gregoire Ailleret and Geoffrey Dewynter helped with carbohydrate measurements during their internship at the University of Melbourne Creswick Campus. We are grateful to Greg Rebetzke (CSIRO, Canberra) for his advice regarding cultivar selection.