人蔘의 地下莖 및 新芽形成에 관한 形態發生學籍 硏究 = The Morphogenetical Study on the Formation of the Subterranean Stem and the New Bud in Ginseng Plants

다국어 초록 (Multilingual Abstract)

It serves as an indispensable criterion for the estimation of ginseng quality to check the size of aginseng head. The present study is intended to clarify the developmental process in a ginseng head in the light of some morphogenetical aspects about the formation of the subterranean stem and the newbud of ginseng plants. The results thus obtained are as follows:
1. New buds and subterranean stems relatively grow at a slow speed until September 21, and after that date which marks the time of withering leaves and stem, they show a rapid growth.
2. Upon the falling·off of a withering stem, there is left a stem scar around which callus-like tissuesand in turn new buds are formed and developed.
3. Since the size of subterranean stem depends on the amount of the developed callus, the production of good quality ginseng necessitates the increase in number of stems.
4, In addition to the most active primary stem primordium, there are Ⅱ, Ⅲ, and IV stem primordial in the developing new· bud
5. In the next spring the primary stem primordium in the developing new bud becomes a new stem and the Ⅱ stem primordium developes as new bud, while the Ⅲ and the Ⅳ stem primordia remain as dormant buds. But in the case of a well-nourished ginseng plant, even the Ⅲ stem primordium developes as a new bud as the Ⅱ stem primordium does.
6. In a four-year-old ginseng plant, the petiole differentiates at early July and the petiolule, at earlyAugust, while the defferentiation of the leaf blades and that of flower buds occur at late August and at middle September, respectively.
7. The total amount of vascular bundles forms by about 30 % of the subterranean stem in a one-year-old ginseng plant, while in the old tissues of the subterranean stem of a four-year-old ginseng plant almost all the xylem parenchyma are displaced by vascular bundles.
8. The number of vessel increases with age, and in a four-year-old ginseng plant the ratio of vessel tissue to other tissues is approximately one to one.