CO2 Responses of Winter Wheat, Barley and Oat Cultivars under Optimum and Limited Irrigation

Sustainability

Ottó Veisz¹  Gyula Vida¹  Zsuzsanna Farkas¹  Balázs Varga¹  Angéla Anda² 

[1] Agricultural Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, H-2462 Martonvásár, Hungary;Georgikon Campus, IES, Hungarian University of Agriculture and Life Sciences, H-8360 Keszthely, Hungary;

关键词: winter cereals;    CO₂ enrichment;    drought stress;    WUE;    climate change;   

DOI  :  10.3390/su13179931

来源: DOAJ

【 摘 要 】

Field crop production must adapt to the challenges generated by the negative consequences of climate change. Yield loss caused by abiotic stresses could be counterbalanced by increasing atmospheric CO₂ concentration, but C₃ plant species and varieties have significantly different reactions to CO₂. To examine the responses of wheat, barley and oat varieties to CO₂ enrichment in combination with simulated drought, a model experiment was conducted under controlled environmental conditions. The plants were grown in climate-controlled greenhouse chambers under ambient and enriched (700 ppm and 1000 ppm) CO₂ concentrations. Water shortage was induced by discontinuing the irrigation at BBCH stages 21 and 55. Positive CO₂ responses were determined in barley, but the CO₂-sink ability was low in oats. Reactions of winter wheat to enriched CO₂ concentration varied greatly in terms of the yield parameters (spike number and grain yield). The water uptake of all wheat cultivars decreased significantly; however at the same time, water-use efficiency improved under 1000 ppm CO₂. Mv Ikva was not susceptible to CO₂ fertilization, while no consequent CO₂ reactions were observed for Mv Nádor and Mv Nemere. Positive CO₂ responses were determined in Mv Kolompos.

【 授权许可】

Unknown