PHYSIOLOGICAL AND ECOLOGICAL STUDIES ON THE GROWTH OF GISENG PLANTS(PANAX GINSENG) : Ⅳ. SUN- AND SHADE-TOLERANCE, AND OPTIMUM LIGHT INTENSITY FOR THE GROWTH Ⅳ. 生長에 對한 耐陽性, 耐陰性 및 最適光量 = 人蔘의 生育에 대한 生理 生態學的 硏究

국문 초록 (Abstract)

1) 人蔘의 生長에 對한 最適光度를 밝히기 위하여 여러가지 다른 光度下에서 耐陽性과 耐陰性에 對하여 實驗하고, 生長屬性을 分析하였다.
2) 莖의 伸長은 光量에 逆比例하였다.
3) 人蔘의 生存을 위한 最少 및 最高光量은 相對照度 3% 및 30%이였고, 生長을 위한 最適光量은 8%이였다. 그러나 葉量이 많고, 莖長이 높은 老植物을 考慮하여, 最高의 物質生産은 8%에서보다 19%에서 期待된다.
4) 葉生長은 8% 以下의 光線에서는 光量에 正比例하였고, 8% 以上에서는 光量에 逆比例하였다.
5) 相對生長率(RGR)과 純同化率(NAR)은 8% 또는 19% 以下에서는 光量에 正比例하고, 그 以上에서는 光量에 逆比例하였다.
6) 葉面積比(LAR)는 被陰度의 增加에 따라 顯著히 增加되었다. 被陰에 의한 LAR의 增加는 NAR의 減少를 相殺하지만, 强光에 의한 LAR의 減少는 오히려 NAR의 減少를 助長하여 RGR 를 더욱 減少시켰다.
7) 葉面積/葉重 比 (F￣/F)에 미치는 光量의 影響은 LAR의 傾向과 恰似하였고, 葉重/個體重 比 (F/W)는 1% 또는 3%까지 被陰度에 正比例하였다. 人蔘의 높은 耐陰性은, 높은 F￣/F에 의한 LAR 의 增加에 基因한다.

다국어 초록 (Multilingual Abstract)

1) In order to elucidate optimum light intensity, the author made an experiment on the sun- and shade-tolerance of ginseng plants under varying light intensities (0.5, 1, 3, 6, 8, 19, 30 and 100% light) and their responses to light intensity were analysed.
2) The growth of stem in height decreased in proportion to the light level except that the stem was shorter in 0.5% than in 1% light(Fig. 1).
3) Minimum, optimum ad maximum light intensity to keep alive were in 3%, 8%, and 30% light, respectively(Fig. 2). In consideration of older plants having the large amount of leaves, for the highest dry matter production it will be reasonable to receive 19% light rather than 8%.
4) The leaf growth in dry weight and in area under various light intensities increased in proportion to the shade from full light to 8% light but the reverse was discerned in lower than 8% light (Fig. 3).
5) In early growth stage the relative growth rate(RGR) decreased in proportion to the intensity of light and of shade with the central portion of 8 or 19% light. The net assimilation rate(NAR) was also similar trend to the RGR. In later growth stage, the RGR increased according to the degree of the shade, under corresponding light level the NAR rather decreased up to 6% light.
6) The leaf area ratio(LAR) increased according to the decrease of the light intensity. Under the deep shade(lower than 8 or 19%) LAR increased by shading offset the depression of NAR. On the contrary, under the light shade (more than 8 or 19%) the decrease of LAR by sun light would rather accerelates the depression of the NAR, which brought about the low RGR.
7) The feature of effect of light intensity on the ratio of leaf area to leaf dry weight(F/F) was similar to that of LAR. The ratio of leaf dry weight to total plant weight(F/W) increased according to the shade up to 1% or 3% light. The extent of increase by shading was larger in F￣/F than in F/W. Therefore, the high shade tolerance of ginseng plant might come about by the high F￣/F, which brings about the high LAR.