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dc.contributor.authorBourgault, Maryse
dc.contributor.authorWebber, Heidi A.
dc.contributor.authorChenu, Karine
dc.contributor.authorO'Leary, Garry J.
dc.contributor.authorGaiser, Thomas
dc.contributor.authorSiebert, Stefan
dc.contributor.authorDreccer, Fernanda
dc.contributor.authorHuth, Neil
dc.contributor.authorFitzgerald, Glenn J.
dc.contributor.authorTausz, Michael
dc.contributor.authorEwert, Frank
dc.identifier.citationBourgault, Maryse, Heidi A. Webber, Karine Chenu, Garry J. O’Leary, Thomas Gaiser, Stefan Siebert, Fernanda Dreccer, et al. “Early Vigour in Wheat: Could It Lead to More Severe Terminal Drought Stress Under Elevated Atmospheric [CO2] and Semi‐arid Conditions?” Global Change Biology 26, no. 7 (May 12, 2020): 4079–4093. doi:10.1111/gcb.15128.en_US
dc.description.abstractEarly vigour in wheat is a trait that has received attention for its benefits reducing evaporation from the soil surface early in the season. However, with the growth enhancement common to crops grown under elevated atmospheric CO2 concentrations (e[CO2]), there is a risk that too much early growth might deplete soil water and lead to more severe terminal drought stress in environments where production relies on stored soil water content. If this is the case, the incorporation of such a trait in wheat breeding programmes might have unintended negative consequences in the future, especially in dry years. We used selected data from cultivars with proven expression of high and low early vigour from the Australian Grains Free Air CO2 Enrichment (AGFACE) facility, and complemented this analysis with simulation results from two crop growth models which differ in the modelling of leaf area development and crop water use. Grain yield responses to e[CO2] were lower in the high early vigour group compared to the low early vigour group, and although these differences were not significant, they were corroborated by simulation model results. However, the simulated lower response with high early vigour lines was not caused by an earlier or greater depletion of soil water under e[CO2] and the mechanisms responsible appear to be related to an earlier saturation of the radiation intercepted. Whether this is the case in the field needs to be further investigated. In addition, there was some evidence that the timing of the drought stress during crop growth influenced the effect of e[CO2] regardless of the early vigour trait. There is a need for FACE investigations of the value of traits for drought adaptation to be conducted under more severe drought conditions and variable timing of drought stress, a risky but necessary endeavour.en_US
dc.rightsThis is the peer reviewed version of the article. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.en_US
dc.titleEarly vigour in wheat: Could it lead to more severe terminal drought stress under elevated atmospheric [CO2] and semi-arid conditions?en_US
mus.citation.journaltitleGlobal Change Biologyen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentResearch Centers.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupNorthern Ag Research Center.en_US

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