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- 저자 : 辛承極 (검색결과 2 건)
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生長抑制 處理가 쉬나무의 줄기 및 뿌리 生長에 미치는 效果
洪性珏,金鍾天,金光鎬,李暻宰,辛承極 建國大學校附設農業資源開發硏究所 1987 農資源開發論集 Vol.12 No.-
The study aimed to investigate the effects of paclobutrazol (PP333), B-9, and girdling on the shoot and root growth of one to five year-old seedlings of Evodia daniellii, of which the seed oil has been developed as a potential fuel substitute for Diesel engine. PP333 was applied, 0.1 to 6ml per seedling depending on the age and the experiment, by soil applicat-ion with water or by xylem injection with methanol. 5000 ppm B-9 was sprayed to the leaves until fully wetted. The bark was girdled 2mm wide in 2 year old seedlings and 5mm wide in 5 year old seedlings, the results were discussed as follows: 1. The number and the longitudinal growth of internode were reduced by all the treat-ments among which the soil application of PP333 was most inhibitory. 2. The diameter growth of the internode was not affected greatly or inhibited, but less severely inhibited than the longitudinal growth by the treatments. The ratio of the diameter to length of the internode which is a good indication of degree of dwarfism was increased by all the treatments, especially high by the soil application of PP333. 3. The xylem growth of the internode was inhibited more greatly than the bark growth by all the treatments among which the soil application of PP333 was most inhibitory. 4. The leaf growth was not affected, or slighly reduced by the treatments. The reduction in the leaf growth, if any, was not proportional to the reduction in the longitudinal growth of the corresponding internode. 5. The prolonged effect of all the treatments was shown in the following year growth: the growth reduction in number and length of internode, xylem diameter, ratio of xylem to bark area in the cross section of internode, which was most apparent in the treatment of PP333 soil application among treatments. 6. The soil application of PP333 reduced the seedling height, the number and the length of internodes, the dry weight and the dry weight ratio of shoot to root of one year-old seedlings. It also reduced the number and the length of internodes in 1 year-old grafted seedlings onto the 3 year-old root stock. The inhibitory effects of PP333 on the growth of the grafted see-dling was presumed as related to the possible disturbance of the source-sink relationship bet-ween the scion shoot and the root stock, in which sufficient nutrients and growth hormones could be supplied to the new shoot growth, if not applied PP333. The presumption was not inconsistent with the results that PP333 decreased the shoot-root ratio, and the xylem to bark area ratio in the cross section of the internode,of which both morphological changes imply the relatively more downward movement of nutrients and growth hormones in the PP333 treated seedlings.
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