臭氧對水稻不同品種葉片為害之比較

The increase of tropospheric ozone concentration affecting the yields of numerous crops was noticed during the last decades. In this study, two O3-treated experiments were conducted in open-top chambers to evaluate the ozone sensitivity of rice cultivars. First, fifteen 42-day-old rice cultivars, including 13japonica cultivars and 2 indica cultivars, were exposed to O3 (120.6 ± 22.7 ppb) for 7 h per day for 10 days. Secondly, these fifteen rice cultivars at 56 days old were exposed to O3(134.8 ± 19.4 ppb) for 7 h per day for 10 days. After ozone exposure, visible leaf injury was quantified by recording a leaf bronzing score (LBS) to evaluate the ozone sensitivity of these tested rice cultivars. Results showed that the japonica cultivars, Kaohsiung 145 and Taikeng 11, were the most tolerant, and both the indica cultivars, Taichung Sen 10 and Taichung Sen 17, were the most sensitive to ozone. The shoot dry weights of rice cultivars Taikeng 2, Taikeng 9, and Taikeng 11 were significantly decreased after O3 exposure; however, the root dry weight of Tainung 71 was significantly increased. The resulting visible leaf injuries did not coincide with the results of dry weights in the tested rice cultivars, suggesting that the short-term O3 treatment can induce leaf injuries of rice but it is not the only factor affecting the biomass of rice.

並列關鍵字

Ozone ； rice (Oryza sativa L.) ； open-top chamber ； visible leaf injury ； leaf bronzing score (LBS)

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臭氧對水稻不同品種葉片為害之比較

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