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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Sericultural and Entomological Science
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Korean Society of Sericultural Science
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Volume & Issues
Volume 22, Issue 1 - Aug 1980
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Studies on Freezing Tolerance of Mulberry, Morus species -Relation between Freezing Tolerance and Some Substances in Mulberry Branches-
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 7~25
Some substances and freezing tolerance in the mulberry (Morus species) branch have been studied on the basis of varietal differences and harvesting times along with harvesting methods in autumn. The results obtained are summarized as follows; 1. The highest freezing tolerance was shown in the varieties of Yongcheon-chou, Jasan, Kang-weon No. 3 and Ichihei, the medium in Roso. Kairyonezumigaeshi, Yanagida and Kokuso No. 28, and the lowest in Ichinose, Mokuso, Kokuso No. 21 and Suweousang No. 3. 2. There was a signifiant negative correlation (r= -0.59＊) between death atop percentage in the field and the temperature required to kill 50% of the mulberry buds (T
) with the harvesting times and methods in autumn. Cold hardening occurred in the early through the end of September with the peak at the mid-september. During this period, leaf harvest decreased freezing tolerance with remarkable decrease due to picking all the leaves and leaving several leaves at the base of branch. Greater cold hardening was induced by leaving several leaves after topping. 3. Negative correlations were observed between freezing tolerance and the contents of soluble (r =-0.70＊) and crude (r= -0.70＊) protein. However, positive correlations were shown between freezing tolerance and total carbohydrate contents per crude (r=0.31＊) and per soluble (r=0.71＊) protein . There were also positive correlations between freezing tolerance and total sugar (r=0.67＊) and RNA content (r=0.99＊＊). No relationships of dry matter. fat. total carbohydrate and DNA contents were observed to the freezing tolerance. 4. Such sugars as raffinose. lactose, sucrose, glucose, fructose. arabinose. xylose. ribose (assumed) and rhamnose were detected in winter mulberry branch. Major sugars such as sucrose, glucose, and fructose were supposed to have higher relationship to the freezing tolerance than the other sugars. 5. Late harvesting increased RNA content except in the case of total leaf picking at mid-September. Leaf picking decreased RNA content. Some amount of RNA was, however, maintained by leaving several leaves after topping Leaving upper-middle leaves of a branch showed high RNA content. Leaving young leaves at the top and the overmatured leaves at the base showed low content. A positive correlation (r=0.51＊) was noted between RNA content and freezing tolerance in the different harvesting methods.s.
Studies on the Varietal Features for the Silk Yielding Ability, Bombyx mori L.
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 26~45
Silk protein is synthesized in the silkgland of silkworm, Bombyx mori L. It is evident that silk productivity is one of the high heritable characters from the genetical aspects. It is also changed with the environmental circumstances. With this regard, this paper dealt with the varietal patterns of silkgland development and the factors concerning to the silk productivity of silkgland of silkworm by the synthesis of nucleic acids, profiles of amino acids and histological basis, using the eight parent silkworm varieties and their F
hybrids. 1. The weight of silkgland per larva increased proportionally in the F
hybrids which were crossed between longer silk yielding varieties. The silk content to the weight of the silkgland was higher in the longer silk yielding varieties than that in the shorter silk yielding varieties. 2. It was observed that the morphological changes of nuclei took place in the posterior silkgland cells with the larval development of the 5th instar. In varietal aspect, Jam 107 and Jam 108, longer silk yielding varieties, showed more branches in nuclei than the
which were shorter yielding ones. 3. It was observed that there was a high correlation between RNA content per unit weight of silkgland on the 6th day stage of 5th instar and silk productivity both in the parents and their F
hybrids. 4. RNA and DNA synthesis brought about thirty percent increase in the posterior silkgland of the longer silk yielding varieties during the 2nd day to the 4th day stages of the 5th instar, when compared with those in the posterior silkgland of the shorter silk yielding varieties. 5. RNA/DNA ratio in the posterior silkgland on the 2nd day and 4th day stages of the 5th instar was more increased in the longer silk yielding varieties than the shorter silk yielding varieties. 6. It was shown that DNA content for the longer silk yielding varieties came to be 374
per larva in the posterior division of silkgland on the 4th day stage of 5th instar, whereas it was 199
per larva for the shorter silk yielding varieties. 7 There was 34.8％ Alanine, 22.8％ Glycine, 9.1％ Serine and 7.3％ Tyrosine in the posterior division of silkgland as major amino acids. It is noticed that there was a little differences between the amino acids composition of posterior silkgland and silk fibroin. 8. There was some differences in the amino acids composition of posterior silkgland between pure lines and their hybrids. Glycine, Serine and acidic amino acids, essential to silk formation, seemed to be increased in the F
hybrids, whereas other amino acids such as Valine, Iso-leucine, Leucine, Lysine. Phenylalanine, Histidine and Arginine were reduced. 9. The content of Glycine, Alanine and Serine in the posterior division of silkgland was elevated in the longer silk yielding varieties than the others. Consequently. these three amino acids in the posterior silkgland seemed to be related to the silk yielding ability in the longer silk yielding varieties.s.
Effects of Foliar Spray of CCC [(2-Chloroethyl)-trimethyl-ammonium Chloride] on the Growth of Mulberry Tree and Metabolic Activities in the Leaves.
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 46~51
The effects of foliar Spray of CCC [(2-Chloroethyl)-trimethyl-ammonium Chloride] on the growth of mulberry tree and the metabolic activities in the leaves were measured. The results of this experiment are summarized as follows; 1. Foliar application of CCC was not effective in increasing of leaf area, the fresh and dry weight of the leaves and height of shoot, but was effective in increasing of diameter of Shoot. 2. Chlorophyll Content was generally increased in all treated leaves 3. All the treated leaves were lower in GOT and GPT activity than control leaves. 4. The activities of hydrolytic reducing Sugar in the mulberry leaves infiltrated Sucrose were lower than those of the control in all treated leaves, but the activities on Synthetic non-reducing Sugar in the mulberry leaves infiltrated glucose were higher than those of control in all treated leaves.
Distribution of Root System and Several Chemical Components of Soil on Low-Cutting Mulberry Field
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 52~58
Root system and distribution of soil components (pH, available P, K, Ca and Mg) were studied in a 20-year old, low-cutting mulberry field. The variety, kairyonezumigaeshi (Morus alba L.), was planted in a spacing of 1.8m
0.6m(740 tiess/10a). Roots and soil samples were taken from each of 196 blocks in a demension of 26
10cm(as shown in Fig. 1) from the soil between rows. 1. Whereas root system concentrated towards the stock, chemical components, pH, available P, Ca and Mg, were increasing toward the center of the row spacing. 2. Root system and distribution of chemical components between trees were not significantly different among blocks. 3. Roots were distributed most densely in a depth of 10∼20, intermediate 20∼30 and 30∼40, and least 0∼10cm. However, the concentrbtion of chemical components was the highest in a depth of 0∼10cm and decreased with soil depth. The soil. a depth of 0∼10cm on the center of row spacing, was the lowest in the root system and the richest in a chemical components. The results indicate that special fertilizinng management is required for the efficient absorption of nutrients.
Effect of Dietary White Ginseng on Larval Growth of Silkworm, Bombyx mori
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 59~62
The effect of dietary white ginseng on growth of silkworm larva was studied with several young and grown silkworm larvae divided into four groups and fed ad basal artificial diet containing different levels of ginseng extract. The four levels of ginseng extract added to basal artificial diet were: 0 (control), 46.6, 139.9 and 279.8 mg per g of dry diet. The results obtained were as follows: 1. The body weight of silkworm larvae fed ad basal artificial diet containing different levels of ginseng extract was increased in 46.6mg ginseng extract level, 139.9mg ginseng extract level and 279.8mg ginseng extract level order. The body weight was greatly increased in 46.6mg ginseng extract level than in control. It is, therefore. considered that a little white ginseng was effective for larval growth in silkworm rearing with artificial diet. 2. The blood sugar content of silkworm larvae fed on an artificial diet containing several levels of ginseng extract was remarkably decreased as compared wilt that of the control silkworm larvae.
The Analysis of the Profitability of Silk Reeling Industry in Korea
Journal of Sericultural and Entomological Science, volume 22, issue 1, 1980, Pages 63~68
The purpose of this analysis is to collect the information on managerial aspects for improving the profitability of silk reeling industry in Korea. Various finacial statistics including balance sheet, profit and loss statement and manufacturing cost statement were analyzed by use of 21 randomly selected enterprise data prepared report by Korea sericultural association during 1972∼1974. The results are as follows. 1. The ratio of profit to sales is the most important factor affecting the profitability of silk reeling industry. 2. This ratio is controlled by the general management and selling cost. 3. The ratio of manufacturing expenses shows a high correlation to the production cost of raw silk.