Differential Growth Responses of Wheat Seedlings to Elevated CO2


  • Hamid Reza ESHGHIZADEH Isfahan University of Technology, College of Agriculture, Department of Agronomy and Plant Breeding, Isfahan (IR)
  • Morteza ZAHEDI Isfahan University of Technology, College of Agriculture, Department of Agronomy and Plant Breeding, Isfahan (IR)
  • Samaneh MOHAMMADI Isfahan University of Technology, College of Agriculture, Department of Agronomy and Plant Breeding, Isfahan (IR)




climate change; CO2 enrichment; genetic diversity; Nitrogen use efficiency; stress susceptibility index


Intraspecific variations in wheat growth responses to elevated CO2 was evaluated using 20 Iranian bread wheat (Triticum aestivum L.) cultivars. The plants were grown in the modified Hoagland nutrient solution at a greenhouse until 35 days of age using two levels of CO2 (~380 and 700 μmol mol–1). The shoot and root dry weights of the wheat cultivars exhibited average enhancements of 17% and 36%, respectively, under elevated CO2. This increase was associated with higher levels of chlorophyll a (25%), chlorophyll b (21%), carotenoid (30%), leaf area (54%) and plant height (49.9%). The leaf area (r = 0.69**), shoot N content (r = 0.62**), plant height (r = 0.60**) and root volume (r = 0.53*) were found to have important roles in dry matter accumulation of tested wheat cultivars under elevated CO2 concentration. However, responses to elevated CO2 were considerably cultivar-dependent. Based on the stress susceptibility index (SSI) and stress tolerance index (STI), the wheat cultivars exhibiting the best response to elevated CO2 content were ‘Sistan’, ‘Navid’, ‘Shiraz’, ‘Sepahan’ and ‘Bahar’, while the ones with poor responses were ‘Omid’, ‘Marun’, ‘Sorkhtokhm’ and ‘Tajan’. The findings from the present experiment showed significant variation among the Iranian wheat cultivars in terms of their responses to elevated air CO2, providing the opportunity to select the most efficient ones for breeding purposes.


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How to Cite

ESHGHIZADEH, H. R., ZAHEDI, M., & MOHAMMADI, S. (2018). Differential Growth Responses of Wheat Seedlings to Elevated CO2. Notulae Scientia Biologicae, 10(3), 400–409. https://doi.org/10.15835/nsb10310286



Research articles
DOI: 10.15835/nsb10310286