Comparison of photosynthetic rates among Panax species and cultivars
1987
Lee, S.S. | Cheon, S.R. | Lee, C.H. (Korea Ginseng and Tobacco Research Inst., Jeungpyung (Korea R.). Jeungpyung Ginseng Experiment Station)
The study was carried out to investigate the effects of light intensity, temperature and seasonal trends on the photosynthesis as well as the physiological characteristics of Panax species and cultivars. Four-year-old plant of Violet-stem variant, Yellow-berry variant, Mimaki and Russian ginseng of Panax ginseng C.A. Mewyer and American ginseng of Panax quinquefolium L. were used for study. These Panax species and cultivars were cultivated under the straw shading. The light saturation point of leaves in Violet-stem variant, Yellow-berry variant, Mimaki and American ginseng were 15,000 lux, but that of Russian ginseng was 10,000 lux. The optimum air temperature on the photosynthesis of Violet-stem variant, Yellow-berry variant, Mimaki and American ginseng were 20 deg C but that of Russian ginseng1547was 15 deg C under 15,000 lux. The photosynthetic rates were increased in order of Russian ginseng, Mimaki, Yellow-berry variant, violet-stem variant and American ginseng. The respiration rates of ginseng leaves were increased according to the increasing of temperature, but it was not different among Panax species and cultivars. Stomata frequency of American ginseng was highest and that of Russian ginseng lowest, while the length of stomata was reverse. The total chlorophyll content of American ginseng and specific leaf weight of Mimaki were higher than that of other ginseng cultivars. The root weight of American ginseng was heavier than that of other ones, but that of Russian ginseng was lighter. The number of leaflets per plant of 2-year-old plant and the root weight of 6-year-old plant were increased in order of Russian ginseng, American ginseng, Mimaki, Yellow-berry variant and Violet-stem vari
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