Effects of peroxides and ozone on visible foliar injury and physiological responses of two Thai and two Japanese rice cultivars
2014
Na-Ngern, P. (Tokyo University of Agriculture and Technology, Fuchu, Tokyo (Japan)) | Chutteang, C. | Aoki, M. | Takemasa, F. | Zhenrui, G. | Chaichana, N. | Pakoktom, T.
Air pollutant concentrations such as ozone (Osub(3)) and peroxides have been increasing in the world, and may cause many negative impacts on crop production. The objectives of the present study are to investigate the effects of peroxides and Osub(3) on visible foliar injury and physiological responses, and to compare the sensitivities among two Thai rice cultivars, RD 31 and Chainat 1, and two Japanese rice cultivars, Nipponbare and Nourin 52, under exposure to single Osub(3) and combined Osub(3) and peroxides. Four treatment plots were prepared, namely control plot (Osub(3) 2-3 ppbv and free peroxides), Osub(3) 50 ppbv plot and free peroxides, Osub(3) 50 ppbv and peroxides 3 ppbv plot and Osub(3) 50 ppbv and peroxides 5 ppbv plot. The results showed that combined Osub(3) and several ppbv peroxides plots caused severe damage on visible leaf injury, increase in Malondialdehyde (MDA) concentration, and decrease in total chlorophyll content and a net photosynthetic rate much higher than single Osub(3) plot. According to the Osub(3) dose response analysis, we found that, in combined Osub(3) (50 ppbv) and peroxides (3 ppbv and 5 ppbv) exposure, in case of visible foliar injury, Chainat 1 was seriously damaged rice cultivar while Nipponbare was a less damaged rice cultivar.
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