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通过对烟草植株覆盖白、红、黄、蓝、紫色滤膜获得不同光质,研究了光质对烟叶生长及光合作用的影响。结果表明,与白膜处理相比,红膜与蓝膜处理下的烟草叶片较厚,比叶面积较小,叶绿素a/b比值、净光合速率、可变荧光强度(Fv)和最大荧光强度(Fm)的比值Fv/Fm(PSⅡ最大光化学量子效率)、PSⅡ实际光化学量子效率(ΦPSⅡ)、光饱和点和CO2饱和点均较高。黄膜处理下的叶片较白膜处理的更薄,净光合速率、Fv/Fm、ΦPSⅡ、光饱和点、CO2饱和点均较低。紫膜处理的叶片比叶面积比白膜处理的小,净光合速率和Fv/Fm比白膜的大。实验结果表明红光、蓝光和紫光促进了烟叶的生长,这种促进作用是与其高光合效率紧密相连的;而黄光对烟叶的生长有一定程度的抑制作用。
Tobacco plants were covered with white, red, yellow, blue and purple filters to obtain different light qualities. The effects of light quality on the growth and photosynthesis of tobacco were studied. The results showed that compared with the white film treatment, the tobacco leaves under thick red film and blue film treatment had smaller specific leaf area, chlorophyll a / b ratio, net photosynthetic rate, variable fluorescence intensity (Fv) and maximum fluorescence intensity Fm / Fm (maximum photochemical quantum efficiency of PSⅡ) and actual photochemical quantum efficiency (ΦPSⅡ) of PSⅡ were higher than those of the control. Compared with white film, the leaf thickness under yellow membrane treatment was thinner, and the net photosynthetic rate, Fv / Fm, ΦPSⅡ, light saturation point and CO2 saturation point were lower. Foliar treated leaves had smaller leaf area than the whitened ones, with higher net photosynthetic rate and Fv / Fm than the whitened ones. The results showed that red, blue and violet promoted the growth of tobacco leaves, which was closely linked with its photosynthetic efficiency. However, yellow light had a certain degree of inhibition on the growth of tobacco leaves.