Caporn S J M, Mansfield T A, Hand D W
Division of Biological Sciences, Institute of Environmental and Biological Sciences, University of Lancaster, Lancaster LA1 4YQ, UK.
AFRC Institute of Horticultural Research, Worthing Road, Littlehampton BN17 6LP, UK.
New Phytol. 1991 Jun;118(2):309-313. doi: 10.1111/j.1469-8137.1991.tb00982.x.
The response of photosynthetic gas exchange to oxides of nitrogen (NOx) was studied in leaves of lettuce (Lactuca sativa L.) at different temperatures. Exposure to > high concentrations (e.g. 13 μmol NO mol ), similar to those often found in commercial glasshouses, caused a rapid inhibition of the net assimilation of CO . This appeared to be by a direct effect on photosynthesis rather than by a change in the stomatal conductance. In ambient CO , (345 μmol mol ), the percentage inhibition at 10 and 5°C was approximately 3× and 5×, respectively, that measured at 20°C. This effect of temperature also occurred when measured in CO , enriched air (1050 μmol mol ), which would normally accompany NO in a glasshouse. The extent of photosynthetic inhibition caused by NO was, however, always less in high than in low CO . The results suggest that when burning fuel to raise the CO , concentration and heat the glasshouse air, growers should avoid generating high concentrations of NO , in conditions of low temperature.
在不同温度下，对生菜（Lactuca sativa L.）叶片光合气体交换对氮氧化物（NOx）的响应进行了研究。暴露于高浓度（例如13 μmol NO mol）下，类似于商业温室中常见的浓度，会导致CO净同化作用迅速受到抑制。这似乎是对光合作用的直接影响，而不是气孔导度的变化。在环境CO（345 μmol mol）中，10°C和5°C时的抑制百分比分别约为20°C时测量值的3倍和5倍。当在富含CO（1050 μmol mol）的空气中测量时，这种温度效应也会出现，而在温室中，CO通常会与NO同时存在。然而，NO引起的光合抑制程度在高CO浓度下总是低于低CO浓度。结果表明，当燃烧燃料以提高CO浓度并加热温室空气时，种植者应避免在低温条件下产生高浓度的NO。
