Journal article
Intraspecific variation in growth and yield response to elevated CO 2 in wheat depends on the differences of leaf mass per unit area
CL Thilakarathne, S Tausz-Posch, K Cane, RM Norton, M Tausz, S Seneweera
Functional Plant Biology | Published : 2013
DOI: 10.1071/FP12057
Abstract
In order to investigate the underlying physiological mechanism of intraspecific variation in plant growth and yield response to elevated CO2 concentration [CO2], seven cultivars of spring wheat (Triticum aestivum L.) were grown at either ambient [CO2] (∼384molmol-1) or elevated [CO2] (700molmol-1) in temperature controlled glasshouses. Grain yield increased under elevated [CO2] by an average of 38% across all seven cultivars, and this was correlated with increases in both spike number (productive tillers) (r≤0.868) and aboveground biomass (r≤0.942). Across all the cultivars, flag leaf photosynthesis rate (A) increased by an average of 57% at elevated [CO2]. The response of A to elevated [CO2..
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Funding Acknowledgements
This research was supported by funding from the Australian Commonwealth Department for Agriculture, Fisheries and Forestry, and the Grains Research and Development Corporation as part of their support for projects related to the Australian Grains Free Air CO<INF>2</INF> Enrichment (AGFACE) facility, which is jointly run by the Victorian State Department of Primary Industries and the University of Melbourne. Chamindathee Lakmini Thilakarathne was supported through a bilateral grant from AusAID. Seeds were provided by Dr Greg Rebetzke, CSIRO, Canberra, Australia. We thank Dr Russell Eastwood and Prof. Richard Trethowan for their kind assistance with cultivar details.