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- Title
Genotypic variability in the response to elevated CO <sub>2</sub> of wheat lines differing in adaptive traits.
- Authors
Bourgault, Maryse; Dreccer, M. Fernanda; James, Andrew T.; Chapman, Scott C.
- Abstract
Atmospheric CO [sub 2] levels have increased from ~280 ppm in the pre-industrial era to 391 ppm in 2012. High CO [sub 2] concentrations stimulate photosynthesis in C [sub 3] plants such as wheat, but large variations have been reported in the literature in the response of yield and other traits to elevated CO [sub 2] (eCO [sub 2]). Few studies have investigated genotypic variation within a species to address issues related to breeding for specific adaptation to eCO [sub 2]. The objective of this study was to determine the response to eCO [sub 2] of 20 wheat lines which were chosen for their contrasting expression in tillering propensity, water soluble carbohydrate (WSC) accumulation in the stem, early vigour and transpiration efficiency. Experiments were performed in control environment chambers and in a glasshouse with CO [sub 2] levels controlled at either 420 ppm (local ambient) or 700 ppm (elevated). The results showed no indication of a differential response to eCO [sub 2] for any of these lines and adaptive traits were expressed in a consistent manner in ambient and elevated CO [sub 2] environments. This implies that for these traits, breeders could expect consistent rankings in the future, assuming these results are validated under field conditions. Additional climate change impacts related to drought and high temperature are also expected to interact with these traits such that genotype rankings may differ from the unstressed condition. Elevated CO [sub 2] increases wheat yields, but the variability in response suggests that some lines might respond better than others. We specifically chose lines that we know differ in various adaptive traits, some which might have limited the reponse to elevated CO [sub 2], and found that all lines responded in the same manner. This suggests that the current breeding effort for drought tolerance will not reduce the response to elevated CO [sub 2].
- Subjects
WHEAT; ATMOSPHERIC carbon dioxide; CLIMATE change; GENETIC research; ATMOSPHERIC chemistry
- Publication
Functional Plant Biology, 2013, Vol 40, Issue 2, p8
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP12193