Will intra-specific differences in transpiration efficiency in wheat be maintained in a high CO2 world? A FACE study

Tausz-Posch, Sabine and Norton, Robert M. and Seneweera, Saman and Fitzgerald, Glenn J. and Tausz, Michael (2013) Will intra-specific differences in transpiration efficiency in wheat be maintained in a high CO2 world? A FACE study. Physiologia Plantarum, 148 (2). pp. 232-245. ISSN 0031-9317


This study evaluates whether the target breeding trait of superior leaf level transpiration efficiency is still appropriate under increasing carbon dioxide levels of a future climate using a semi-arid cropping system as a model. Specifically, we investigated whether physiological traits governing leaf level transpiration efficiency, such as net assimilation rates (Anet), stomatal conductance (gs) or stomatal sensitivity were affected differently between two Triticum aestivum L. cultivars differing in transpiration efficiency (cv. Drysdale, superior; cv. Hartog, low). Plants were grown under Free Air Carbon dioxide Enrichment (FACE, approximately 550μmolmol-1 or ambient CO2 concentrations (approximately 390μmolmol-1). Mean Anet (approximately 15% increase) and gs (approximately 25% decrease) were less affected by elevated [CO2] than previously found in FACE-grown wheat (approximately 25% increase and approximately 32% decrease, respectively), potentially reflecting growth in a dry-land cropping system. In contrast to previous FACE studies, analyses of the Ball et al. model revealed an elevated [CO2] effect on the slope of the linear regression by 12% indicating a decrease in stomatal sensitivity to the combination of [CO2], photosynthesis rate and humidity. Differences between cultivars indicated greater transpiration efficiency for Drysdale with growth under elevated [CO2] potentially increasing the response of this trait. This knowledge adds valuable information for crop germplasm improvement for future climates.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © Physiologia Plantarum 2012. Permanent restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 01 Jul 2014 01:08
Last Modified: 23 Mar 2017 00:09
Uncontrolled Keywords: acclimatization; biological transport; carbon dioxide; chlorophyll; circadian rhythm; light; photosynthesis; plant leaves; plant stomata; plant transpiration; Triticum; water
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070103 Agricultural Production Systems Simulation
06 Biological Sciences > 0604 Genetics > 060412 Quantitative Genetics (incl. Disease and Trait Mapping Genetics)
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Identification Number or DOI: 10.1111/j.1399-3054.2012.01701.x
URI: http://eprints.usq.edu.au/id/eprint/25394

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