• Korean Journal of Agricultural and Forest Meteorology
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• v.18 no.4
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• pp.264-273
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• 2016

This study was conducted to find out the influence of water stress from May to June on photosynthesis, shoot growth and fruit quality of apple trees. Fuji'/M.9 apple trees were root pruned at full bloom (30th April), parallel to the row of 30 cm or 60 cm from the trunk, to one side or both sides of trunk. The average value of afternoon leaf water potential from May to June of the no root pruning was maintained over -1.80 MPa, but that of root-pruning treatments was maintained under -1.80 MPa. In the comparison of average value of leaf water potential from May to June by root-pruning degree, the root pruning both sides at 30 cm from trunk was lowest (-2.06 MPa), followed by the root pruning both sides at 60 cm (-2.02 MPa) and the root pruning one side at 30 cm (-1.91 MPa). Root pruning one side at 30 cm or both sides at 60 cm reduced photosynthetic rate from May to June by 80% or 65%, respectively, compared with no root pruning. So, the degree of decreasing total shoot length or average fruit weight compare to the no root pruning of the root pruning one side at 30 cm was 25% or 11%, respectively, and those of the root pruning both sides at 30 cm was 45% or 15%, respectively. However, the soluble solid content and fruit color of the root pruning was higher than those of the no root pruning, and those of the root pruning both sides was higher than root pruning one side. These results indicate that the fruit enlargement was decreased when the average value of average leaf water potential from May to June was under -1.80 MPa, and the shoot growth was decreased when that was under -2.00 MPa.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.60 no.2
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• pp.253-256
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• 2015

This study was performed to investigate the growth characteristics and inorganic components of Codonopsis lanceolata regarding regional differences. The plant height of Japanese Codonopsis lanceolata was 373.6 cm, so it's revealed that it has more vigorous growth than Korean won. The flowering time of Korean Codonopsis lanceolata was 2 weeks faster than Japanese one. Total fresh weight of root was 41.0 g and 39.0 g for Korean and Japanese respectively, thus, no significance difference was found. However, regarding fresh weight, Korean one had a more fresh weight (35.4 g) of main root parts, but Japanese one had a more fresh weight (9.6 g) of the lateral root part. Each inorganic component was found more in the aboveground parts, regardless of the region and the content of K was the largest. Regarding the content of macroelements for each part of Codonopsis lanceolata, the content of Na, Mg, P, S, and Ca in Korean Codonopsis lanceolata was found the highest on the leaf, followed by stem and root. In the case of Japanese Codonopsis lanceolata, same result was found on the content of Mg and Ca, however, the highest content of Na and P was found in the stem.

• Nutritional Sciences
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• v.4 no.1
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• pp.13-19
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• 2001

This study was designed to investigate the effects of Coriandrum Sativum L. on lipid metabolism in rats with hypertriglyceridemia. Also, we compared the effects of the leaf, seed and root of Coriandrum Sativum L. on lipid metabolism in rats with hypertriglyceridemia. Hypertriglyceridemia was induced in 32 male Sprague-Dawley rats weighting 108$\pm$13 g through the feeding of high-fat diets containing 20% fat and 5% cellulose for ten days. The rats were divided into four groups as follows : control (C), leaf (L), seed (S) and root (R) groups. For the five-week experimental period, the C group was fed the above diet an the L, S and R groups were fed Coriandrum Sativum L. diets containing 5% dry leaf, seed and root of Coriandrum Sativum L., respectively. Intake of diet and weight gain were significantly lower in the C group than in the L, S and R groups. But there was no significant difference among the L, S and R groups. Because of weight differences among the groups, all obtained data was adjusted to weight. The level of plasma total cholesterol was not significantly different among the four groups. But after adjusting to weight differences, the level of plasma triglyceride was significantly higher in the C groups than in the L and S groups. These results suggest that dietary Coriandrum Sativum L. may increase appetite and have an inhibitory effect on the lipid metabolism of rats with hypertriglyceridemia. Also, those effects may be partly different (leaf, root and seed) from those of Coriandrum Sativum L.

• Korean Journal of Medicinal Crop Science
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• v.8 no.3
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• pp.250-258
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• 2000

Hairy root cultures of Rheum undulatum L. induced by a co-culture with Agrobacterium rhizogenes ATCC15834 were established and the production of tannin in hairy roots was investigated. The growth of hairy roots was maximized in WPM liquid medium supplemented with 2 mg/L IAA, and 3% sucrose (pH 5.7). The highest yields of tannin were obtained from WPM medium containing 0.5 mg/L ABA, and 5% sucrose (pH 5.5). The growth and tannin production in hairy root cultures were influenced by the addition of elicitors to the medium. The addition of 50 mg/L chitosan enhanced the production of tannin with about 1.7 fold.

• Korean Journal Plant Pathology
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• v.3 no.3
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• pp.164-167
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• 1987

The effects of infection severity of susceptible tomato varieties, Rutgers and Boksu 2, by root-knot nematode, meloidogyne hapla, M. arenaria or M. javanica on plant growths and tomato yields were investigated. The inoculum levels of each nematode species were 0, 1,000 and 10,000 nematodes per 42cm diam. pot. Tomato yield was reduced by the nematode infection. Severity of infection was on the decreasing order of M. javanica, M. incognita, M. arenaria, M. hapla, ranging from $80\%$ by M. javanica to only $7\%$ by M. hapla. Yield reduction by infection of M. hapla was more prominent in Boksu 2 than in Rutgers. However the results were vice versa for the other nematode species, The top fresh-weight of Rutgers inoculated with 10,000 nematodes was greater than root weight, regardless of the nematode species, whereas plant height and top fresh weight decreased with increasing root weight when inoculated with inoculum density of 1,000/pot.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.2
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• pp.179-185
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• 1986

This study was to compare year variations of heritability, phenotypic, genotypic and environmental correlations as well as pathway coefficients for main characters of tea tree to provide useful selection information for improving tea tree. The data collected from the performance yield trials from 1979 to 1981 were used in this study. I. The genetic variance of fresh fruit yielding, dryed fruit yielding and fresh weight of root was not only greatly varied with year, but also the largest among all characteristies studied. Other characteristics showed higher genetic variance than environmental variances, and year variances were not large. 2. Both year and variety x year interaction were highly significant sources of variation for all yield characteristics, and year variances were not large. 3. All characteristics showed high broad sense heritabilities, and the broad sense heritability was not varied with year. 4. The genetic correlation coefficients between fresh fruit yielding and dryed fruit yielding, fresh weight of root and Gigolpi, dryed weight of root and Gigolpi were positive, and the year variation was not large. S. The pathway coefficients of the character was not only greatly varied with year and the fresh weight of root affected directly on the Gigolpi.

• Proceedings of the Korean Society of Crop Science Conference
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• 2017.06a
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• pp.198-198
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• 2017

Cultivated varieties of sweet potato were from dry texture type to tender texture type on the basis of consumer preferences. There are many differences in the quantity of sweet potato, starch content, pigment, and sugar content depending on the cultivation season and area, even in the same variety. Therefore, in this study, we attempted to establish optimum time of harvesting through growth characteristics and variation in component like starch, sugar, polyphenol and flavonoid. Four sweet potato varieties were used in this experiment. Among them, Jinhongmi (JHM) & Yulmi (YM) were as dry texture type and Pungwonmi (PWM) & Hogammi (HGM) were as tender texture type. Sweet potatoes were transplanted on 23 May, 2016 and were investigated storage root weight and component contents every 20 days from 60 days to 120 days and surveyed yield at 110, 120, 130 days after transplantation. Result revealed that storage root weight of YM, JHM, and HGM were 30.1, 38.9, 20.8 g respectively in 60 days after transplanting. Storage roots of PWM gerw faster with the weight of 88.2 g. In 120 days after transplanting, storage root weight varied from 88.3 to 118.7 g, HGM was the smallest, and PWM was the largest. Sugar contents of sweet potato ranged from 21.0 to $23.8Brix^{\circ}$ in 60 days after transplanting and from 27.5 to $30.78Brix^{\circ}$ in 120 days after transplanting. In particular, the sugar content of HGM was the highest over $30Brix^{\circ}$ after 80 days. The starch content of dry texture type (YM, JHM) increased from 15.5% to 20.4% and tender texture type (PWM, HGM) increased from 11.0% to 17.3%. Starch content tended to be high in dry type sweet potatoes. The content of polyphenol and flavonoid were highest in 60 days after transplanting and was reduced according to cultivation period. The total yield of PWM was high as 3,154 kg/10a and large storage root of over 250 g accounted for 47.4% in 110 days after transplanting. Storage root (YM, JHM, HGM) of 81~150 g accounted for 34.9% ~ 43.2% in 120 days after transplanting. These are the most marketable. Because consumer in Korea prefers small, round and about 100g size sweet potato. The ratio of large storage root (over 250 g) were increased in all varieties at 130 days after transplanting. Therefore, it is considered appropriate to harvest PWM at 110 days and YM, JHM, HGM at 120 days after transplanting, which planted in late May.

• Korean Journal of Organic Agriculture
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• v.19 no.spc
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• pp.267-270
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• 2011

Root-knot nematodes cause a significant damage on fruit yield and quality of green house growing crops. To asses the effect of eggplant rootstock, Torvum vigor', TaibyouVF' and 'Daitaro' were grafted on eggplants(Solanum melongena cv. Chookyang) and planted in root-knot nematode infested microplot in green house and compared their fruit yield, quality and plant growth with non-grafted control. Eggplant grafted with Torvum vigor had the highest fruit yield and top growth and followed by Daitaro. Non-grafted eggplant had lower yield but had higher root weight because of heavy root-knot nematode infection. Rootstock grafting in eggplant farming is a good alternative technique in root-knot nematode infested green houses without compromising fruit yield and can be applied instantly as organic farming practice.

• Korean Journal of Organic Agriculture
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• v.10 no.1
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• pp.65-74
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• 2002

The results of the experiment about the effect of the length of electrical stimulation treatment time on the yield components and NO$_3$ content in edible parts of 2 cherry type radishes(Raphanus salivas L.) were like followings. 1. The 2 hours electrical stimulation promoted the length of leaf and the enlargement of the root diameter of 'Comet' and 'Sakuranbo' cultivars, and their root diameters were increased by 14.7% and 12.8% respectively than that of the control. 2, The plot which showed the highest root fresh weight was the 2 hours stimulation plot in 'Comet' and 8 hours stimulation plot in 'Sakuranbo', and these results were approximately 39% higher than that of the control. 3. All of the electrically stimulated plots of 'Comet' and 'Sakuranbo' showed higher NO$^{[-10]}$ $_3$content in roots than the control. And the amount of NO$^{[-10]}$ 3 in their roots showed a remarkable positive correlation with the root diameter, the root fresh weight and the total fresh weight.

• Korean Journal of Medicinal Crop Science
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• v.21 no.3
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• pp.179-183
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• 2013

This study was carried out to investigate the variation of growth and yield using different planting densities and vinyl mulching in S. miltiorrhiza cultivation. Top plant growth was observed in the $30{\times}30cm$ planting density of S. miltiorrhiza;, plant height, leaves and branches were larger than in the other treatments. Root length, root diameter, and supporting roots of underground part were increased as planting density was wide, and dry root weight was increased in $30{\times}30cm$. However, yield was highest at 294 kg/10a in the planting density of $30{\times}10cm$. The use of 30-31cm white and black vinyl mulching had no significant effect on the plant height of S. miltiorrhiza, as compared to non-mulching. However, the highest volume of leaves and plant weight was observed in plants using 24.7 black vinyl mulching. Dry underground root weight was highest in black vinyl mulching at 21.7 g compared to 17.0 g for non-mulching. Yield per 10a increased by 28% using black vinyl mulching compared to non-mulching. Based on the results of this study, planting density of $30{\times}10cm$ and black vinyl mulching are the most suitable in the cultivation of S. miltiorrhiza.