Can a wheat cultivar with high transpiration efficiency maintain its yield advantage over a near-isogenic cultivar under elevated CO₂?

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• 作者：Sabine Tausz-Posch^a ; ^{sposch@unimelb.edu.au} ; Saman Seneweera^a ; Robert M. Norton^a ; ^b ; Glenn J. Fitzgerald^c ; Michael Tausz^d
• 关键词：Climate change ; Free Air Carbon dioxide Enrichment (FACE) ; Triticum aestivum L.
• 刊名：Field Crops Research
• 出版年：2012
• 期刊代码：44_03784290
• 类别：abs
• 出版时间：11 July, 2012
• 卷：133
• 期：Complete
• 页码：160-166
• 文件大小：333 K

摘要

This study investigated whether yield advantages of the wheat cultivar 鈥楧rysdale鈥?(selected for high transpiration efficiency) over recurrent parent 鈥楬artog鈥?(low transpiration efficiency) are maintained under future atmospheric CO₂. Growth, yield and yield components at three developmental stages (stem elongation, anthesis, maturity) were evaluated at two CO₂ concentrations (ambient, a[CO₂], 鈭?90 渭mol mol^鈭? and elevated, e[CO₂], 鈭?50 渭mol mol^鈭?). Growth under e[CO₂] stimulated yield and above ground biomass on average by 鈭?8%. 鈥楬artog鈥?compared to 鈥楧rysdale鈥?had significantly greater crop growth rate (鈭?4%), above ground biomass (鈭?5%), leaf area index (鈭?5%) and tiller numbers (鈭?6%) during early development (stem elongation). 鈥楬artog鈥? however, lost this initial growth advantage over 鈥楧rysdale鈥?until anthesis when 鈥楧rysdale鈥?had more green leaf mass (鈭?5%) and greater spike (鈭?%) and tiller (鈭?1%) numbers, particularly when grown under e[CO₂]. At maturity, this resulted in a yield advantage of 鈭?9%of 鈥楧rysdale鈥?over 鈥楬artog鈥?when grown under e[CO₂] but only of 鈭?%under a[CO₂]. We suggest that wheat cultivars selected for superior transpiration efficiency will remain successful in a high [CO₂] world. Evidence from this study even indicates that such cultivars may confer future advantage in some environments where this is not evident under current [CO₂].