Mishra Amit Kumar, Rai Richa, Agrawal S B
Laboratory of Air Pollution and Global Climate Change, Department of Botany, Banaras Hindu University, Varanasi 221005, India.
Indian J Biochem Biophys. 2013 Apr;50(2):139-49.
The effects of elevated CO2 and O3, singly and in combination were investigated on various physiological, biochemical and yield parameters of two locally grown wheat (Triticum aestivum L.) cultivars (HUW-37 and K-9107) in open top chambers (OTCs). Elevated CO2 stimulated photosynthetic rate (Ps) and Fv/Fm ratio and reduced the stomatal conductance (gs). Reactive oxygen species, lipid peroxidation, anti-oxidative enzymes, ascorbic acid and total phenolics were higher, whereas Ps, gs, Fv/Fm, protein and photosynthetic pigments were reduced in elevated O3 exposure, as compared to their controls. Under elevated CO2 + O3, elevated levels of CO2 modified the plant performance against O3 in both the cultivars. Elevated CO2 caused significant increase in economic yield. Exposure to elevated O3 caused significant reduction in yield and the effect was cultivar-specific. The study concluded that elevated CO2 ameliorated the negative impact of elevated O3 and cultivar HUW-37 was more sensitive to elevated O3 than K-9107.
在开顶式气室（OTC）中，研究了二氧化碳（CO₂）和臭氧（O₃）浓度升高单独及联合作用对两个当地种植的小麦（Triticum aestivum L.）品种（HUW - 37和K - 9107）各种生理、生化和产量参数的影响。二氧化碳浓度升高刺激了光合速率（Ps）和Fv/Fm比值，并降低了气孔导度（gs）。与对照相比，在臭氧浓度升高的情况下，活性氧、脂质过氧化、抗氧化酶、抗坏血酸和总酚含量较高，而光合速率、气孔导度、Fv/Fm、蛋白质和光合色素含量降低。在二氧化碳 + 臭氧浓度升高的情况下，二氧化碳浓度升高改变了两个品种对臭氧的植物表现。二氧化碳浓度升高导致经济产量显著增加。暴露于臭氧浓度升高会导致产量显著降低，且这种影响具有品种特异性。该研究得出结论，二氧化碳浓度升高减轻了臭氧浓度升高的负面影响，且品种HUW - 37比K - 9107对臭氧浓度升高更敏感。
