Effects of ozone on the light use of rice (Oryza sativa L.) plants
Effects of ozone on the light use of rice (Oryza sativa L.) plants
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DOI：
10.1016/0167-8809(94)00560-2
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发表时间：
1995-03
期刊：
影响因子：
--
通讯作者：
K. Kobayashi;M. Okada
中科院分区：
文献类型：
--
作者：
K. Kobayashi;M. Okada
1987年、1988年和1989年，在田间暴露室中，通过植物暴露于臭氧的光利用实验，探讨了臭氧对水稻生长过程的影响。利用设置在水稻冠层上方和下方的光传感器测量了入射光、反射光和透射光通量。光利用效率（LUE）由水稻冠层总干重和累积的光吸收量计算。结果表明，在营养生长期，随着叶面积指数（LAI）的增加，光吸收量增加，但抽穗后，尽管叶面积指数因衰老而降低，但光吸收量基本不变。虽然没有发现臭氧对光吸收的影响，但臭氧降低了LUE。营养生长期的臭氧平均浓度与LUE的关系符合二次函数关系，生殖生长期的臭氧平均浓度与LUE的关系符合线性函数关系。臭氧对LUE的影响在生殖期大于营养期。讨论了臭氧增强对生殖阶段LUE影响的机制。
Effects of ozone on rice growth processes were addressed in terms of light use of plants exposed to ozone in field exposure chambers in experiments in 1987, 1988 and 1989. Incident, reflected and transmitted light fluxes were measured with light sensors set above and below the rice canopy in the exposure chambers. Light-use efficiency (LUE) was calculated from the total dry weight and the accumulated amount of light absorbed by the rice canopies. The results showed increase of light absorption with the increase of leaf area index (LAI) during the vegetative growth, but light absorption was almost constant after heading despite the decrease of LAI due to senescence. While no effects of ozone on light absorption were found, the LUE was decreased by ozone. A quadratic function was fitted to the relationship between mean ozone concentration and LUE during the vegetative growth, and a linear function was fitted to the relationship for the reproductive growth. The effect of ozone on LUE was much greater in the reproductive than in the vegetative stage. Some mechanisms were discussed with regard to the enhancement of the ozone impact on LUE in the reproductive stage.