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首页> 外文期刊>農業気象 >Effects of Ozone on Photosynthetic Components and Radical Scavenging System in Leaves of Rice (Oryza sativa L.)
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Effects of Ozone on Photosynthetic Components and Radical Scavenging System in Leaves of Rice (Oryza sativa L.)

机译：臭氧对水稻叶片光合成分和自由基清除系统的影响

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摘要

The chronic effects of ambient levels of O-3 on photosynthetic components and radical scavenging system of leaves at different positions on the main stein of Japanese rice (Oryza sativa L.) were investigated. Two cultivars of Japanese rice (Koshihikari and Kinuhikari) were planted in plastic boxes filled with flooded Andisol in 9 chambers on 15 May, and exposed daily to charcoal-filtered air or O-3 at 60 or 100 nl l(-1) (ppb) (10:00-17:00) from 30 May to 20 September 2007.The activity and concentration of ribulose 1, 5-bisphosphate carboxylase/oxygenase (Rubisco) in the leaves of both cultivars were not significantly affected by exposure to O-3. However, the concentrations of chlorophyll in the lower leaves on the main stein of both cultivars were significantly reduced by the exposure to 100 ppb O-3, while the exposure to O-3 significantly increased the activities of ascorbate peroxidase (APX), monodehydroascorbate reductase (MDAR) and glutathione reductase (GR); regardless of the leaf position in the two cultivars. Although no significant combined effect of O-3 and cultivar on the concentration of chlorophyll, the activity and concentration of Rubisco, or the concentration of antioxidants and activity of radical scavenging enzymes was observed, there was a highly positive correlation between the AOT40 (accumulated exposure over a threshold of 40 ppb) of O-3 and the relative activity of APX, MDAR or GR in leaves exposed to O-3 to that in leaves exposed to charcoal-filtered air of both cultivars. These results suggest that APX, MDAR and GR played important roles in the antioxidative response of Japanese rice to O-3. However, the detoxification capacity of reactive oxygen species by APX, MDAR and GR was insufficient to prevent the adverse effects of ambient levels of O-3 on the concentration of chlorophyll in the two cultivars of Japanese rice.
机译：研究了O-3的环境水平对日本水稻主种（Oryza sativa L.）不同部位叶片光合组分和自由基清除系统的慢性影响。 5月15日，将两个品种的日本大米（越光和久光）种植在装满洪水的Andisol的塑料盒中的9个隔室中，每天以60或100 nl（-1）（ppb）的木炭过滤空气或O-3暴露）（2007年5月30日至9月20日（10：00-17：00））。两个品种的叶片中核糖1,5-双磷酸羧化酶/加氧酶（Rubisco）的活性和浓度不受O-暴露的影响3。但是，暴露于100 ppb O-3会显着降低两个品种主茎上较低叶的叶绿素浓度，而暴露于O-3则显着增加抗坏血酸过氧化物酶（APX），单脱氢抗坏血酸还原酶的活性。 （MDAR）和谷胱甘肽还原酶（GR）;不管两个品种中的叶片位置如何。尽管没有观察到O-3和品种对叶绿素浓度，Rubisco活性和浓度，抗氧化剂浓度和自由基清除酶活性的显着联合影响，但AOT40与累积的暴露量之间存在高度正相关。 O-3的阈值超过40 ppb），并且暴露于O-3的叶片与暴露于两个品种的经炭过滤的空气的叶片中的APX，MDAR或GR的相对活性。这些结果表明，APX，MDAR和GR在日本大米对O-3的抗氧化反应中起着重要作用。然而，APX，MDAR和GR对活性氧的解毒能力不足以防止O-3的环境水平对日本水稻两个品种中叶绿素浓度的不利影响。

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