• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.4
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• pp.360-365
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• 1993

The infant seedling of rice(8-to 10-day-old) has often suffered from submergence just after transplanting due to the too short seedling height, 5 to 8cm, This experiment was conducted to elucidate the effect of gibberellic acid($GA_3 : 25% soluble liquid) with the application methods of foliar spray and seed-soaking on the elongation of seedling height of infant rice seedling in machine transplanting, We used a japonica rice variety, Hwaseongbyeo, and the seeding rate was 200g per seed tray(30$\times60$\times3cm). Generally,$GA_3 and Metalaxyl increased the elongation of seedling height of infant seedling while Tetracycle decreased the seedling height, To increase the seedling height of infant seedling, the foliar spary application of $GA_3 was better than seed-soaking treatment. The optimum concentration of $GA_3 for the foliar spray was about l0ppm and the optimum application time of $GA_3 was 3 to 4 days after sowing.

• Korean Journal of Organic Agriculture
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• v.22 no.2
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• pp.321-334
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• 2014

This study was conducted to identify plant growth promoting effects of native plant resources and medicinal plants. 65 kinds of plant extracts from 64 species were evaluated based on two rice(Oryza sativa) seedling bioassays for gibberellins and gibberellin-like substances. 12 extracts of Artemisia princeps stem and leaf, Cirsium japonicum var. maackii whole plant, Rhododendron mucronulatum branch and leaf, Phragmites communis stem, Coix lacryma-jobi var. mayuen whole plant, Lespedeza bicolor branch and leaf, Hydrangea serrata f. acuminata whole plant, Phlomis umbrosa whole plant, Glycyrrhiza uralensis Rhizome, G. uralensis stem and leaf, Angelica gigas root, and Cnidium officinale rhizome showed growth promotion of rice seedlings. Our results suggested that the parts of these plants could be the potential sources as farm-made liquid fertilizers for plant growth promotion.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.11a
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• pp.233-240
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• 2002

식물체내에 미량으로 생성되어 식물체내의 생리적인 작용을 크게 변화시켜 식물의 생장과 발육을 촉진 또는 억제하는 생장조절물질의 종류로는 Auxin, Cytokinin, Gibberellin, Abscisic acid, Ethylene, Brassinosteroids, Polyamine, Jasmonates 등이 있다(byun, 1982). Gibberellin은 포도의 경우 씨 없는 포도(무핵과)를 만드는 기술이 델라웨어 품종을 주축으로 실용화 되어있고(Weaver, 1972) 배의 행수와 신고 품종에서는 Gibberelli paste처리에 으해 5∼7일의 숙기 촉진과 함께 과중의 비대에 효과가 있으나 이러한 Gibberellin 계통의 식물생장조절제 사용으로 과실의 경도가 낮아지고 부패과, 밀병 및 분질화 등의 생리장해가 발생하고 보구력이 크게 떨어지는 단점이 있다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1997.05a
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• pp.17-22
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• 1997

본 연구에서는 고구마 조직배양묘의 $CO_2$ 교환량을 측정하기위해 개방형 광합성측정장치의 원리를 이용해 자체제작한 $CO_2$ 교환량 측정장치를 이용하여 공기 주입구와 배출구의 $CO_2$ 농도를 연속측정하고, 명기와 암기에 있어서의 $CO_2$ 교환량의 일변화를 분석했다. 내용적 1.48$\ell$의 배양기에 32개의 식물체를 이식했을 때 식물체당 일일 $CO_2$ 교환량은 19일째에 포화에 달했다. 식물체 생장에 있어서는 자연환기구보다 강제환기구의 생장이 촉진되었고, 강제환기구에서는 $CO_2$ 시용구가 무시용구보다 생장이 촉진되었다. 본 연구의 결과는 고구마 조직배양묘를 강제환기와 $CO_2$ 시용등 배양환경의 개선함으로써 순환과정을 거치지 않고 포장정식이 가능한 배양묘나 삽수의 생산이 가능함을 시사한다고 사료된다.

• Journal of Bio-Environment Control
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• v.16 no.1
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• pp.47-53
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• 2007

This study was carried out to identify the treatment methods for the inhibition of lateral roots and promotion of hypocotyl enlargement using plant growth regulators for the production of high quality soybean sprouts. Inhibition of lateral root formation was not significant from the $CA_3$ and NAA treatments. From the treatment of BAP, lateral roots were not occurred at all, and hypocotyl enlargement was promoted at the low concentration of $10\;mg{\cdot}L^{-1}\;and\;15\;mg{\cdot}L^{-1}$. Promotion of hypocotyl enlargement was higher as the BAP treatment time was shorter. The optimum time of BAP treatment was 6 hours. Occurrence ratio of lateral roots were low and hypocotyl enlargement was promoted from water supply every 24 hours after BAP treatment. In the indole B treatment, lateral roots occurrence was very low with the concentration of 1.1%, which is much lower than the optimum concentration of 4.2%.

• Korean Journal of Plant Resources
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• v.1 no.1
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• pp.48-52
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• 1988

In order to examine the effect of growth regulators on flower bud formation and anthesis, various growth regulators were applied during the initiation and growthstages of flower bud development in Camellia. The inhibitor CCC increased flowerbud formation. But gibberellin had a strong suppressing effect of flower budformation while it stimulated elongatien of shoots. On the other hand, gibberellinpromoted the growth of flower buds and hastened anthesis, while other growthregulators had no effect.

• Microbiology and Biotechnology Letters
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• v.36 no.4
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• pp.268-275
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• 2008

In order to develop the multi-functional rhizobacteria that can exert positive effect on the growth of plants growing in the coastal sand dune located along East Coast of Korea, rhizospheral bacteria of 11 different plants from this area were isolated 1,330 rhizobacteria. Among these, 23 strains were able to produce auxin and had spectrum of antagonism toward various phytopathogenic microbes. To know the mechanism of this antifungal activity, these 23 strains were subjected to further analyses; 19 strains of these produced siderophore as determined by color reaction on CAS-blue plate, 4 strains produced antifungal cellulase as judged by color change on CMC-Congo red plate, 17 strains were able to utilized insoluble phosphate salts, also determined by clear zone formation on PVK medium. Identification of the strain was assigned to all 23 strains by l6s rDNA sequence analysed, and all were identified to be in the genus of Bacillus and Pseudomonas. One strain of these, denoted Pseudomonas fluorescens IB4-14, showed ACC deaminase activity which is known to be involved in the resistance of environmental stress such as salt and drought. Also, P. fluorescens IB4-l4 showed the germination stimulation and roots growth promoting activity on the in vivo assay of Lysimachia mauritiana Lam. (spoonleaf yellow loosestrife).

• Food Science of Animal Resources
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• v.22 no.1
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• pp.59-65
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• 2002

This study was carried out to evaluate the effect of whey protein concentrate-80%(WPC-80) and whey protein isolate(WPI) on the growth of B. bifidum Bb-11. Whey proteins($\alpha$-lactalbumin, $\beta$-lactoglobulin) were digested with trypsin, then their hydrolyzates were separated into three fractions (>10,000Da, 3,000∼10,000Da, <3,000Da) by two-step ultrafiltration process with Centriprep 10 and Centricon-30. These three fractions by molecular weight were evaluate growth-promoting effects for the B. bifidum Bb-11. The results obtained were summarized as follows; The growth rate of B. bifidum Bb-11 tended to increase by supplementation of WPC-80 to basal medium, but decreased by supplementation of WPI. Two whey proteins were hydrolyzed by trypsin at 40$\^{C}$ for 6 hrs, and three fractions were collected by UF treatment and concentrated by Centricon-30. Collected concentrations of protein of F-I and F-II and F-III from $\alpha$-lactalbumin were 11.53mg, 7.79mg, and 5.21 mg and those of protein from $\beta$-lactoglobulin were 4.13mg, 5.30mg, and 9.351mg, respectively. Three fractions of $\alpha$-lactalbumin hydrolyzates promoted the growth rate of B. dbifidum Bb-11. Growth promoting activities of hydrolyzates(F-I and F-II) with molecular weight below 10,000Da were stronger than that of hydrolyzate(F-III) above 10,000Da. However, there was no significant difference between the hydrolyzate F-I and F-II. Three fractions of $\beta$-lactoglobulin hydrolyzates improves the growth rate of B.bifidum Bb-ll. The growth of B.bifidum Bb-ll was decreased after 24 hr incubation by supplementation of either F-II or F-III fraction compared to basal Whey medium, but maintained the enhancement by supplementation of F-I.

• Microbiology and Biotechnology Letters
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• v.29 no.4
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• pp.227-233
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• 2001

To maximize astaxanthin (3,3'-dihydroxy-$\beta\beta$'carotene-44'-dione) production by high density Haematococcus pluvialis cultures, various, media were examined Among tested media, \`Hong Kong Medium and Modified Bolds Basal Medium showed the best result for cell growth ( $2.0$\times$10^{ 6}$cells /mL) and for astaxanthin content per cell (9.7 mg astaxanthin mg/g cell), respectively, Maximum astasanthin concentration of 6.1mL was obtained at pH 7.5, $20^{\circ}C$~$25^{\circ}C$ Deficiencies of nitrogen source($NaNO_3$ and proteose-peptone) found to simulate astaxanthin formation Relatively low light inten- sity of $60\mu$E ($\m^2$s) was sutiable for vegetative cell growth while higher light intensity was required for higher astaxanthin accumulation.

• Microbiology and Biotechnology Letters
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• v.40 no.2
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• pp.135-143
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• 2012

This study's aim is to isolate and characterize plant growth promoting Enterobacter species for the biological control of gray leaf spot in pepper. Screening was carried out from the rhizosphere of Agropyron tsukushiensi var. transiens (Hack.) Ohwi in Dok-do. Rhizobacterial isolates were partially identified by 16S rDNA sequencing and Enterobacter species were tested for plant growth promoting capabilities and the induction of systemic resistance in pepper against gray leaf spot caused by Stemphylium solani. Isolates were tested for production of indole-acetic acid and siderophore, and for phosphate solubilization. The application of isolates was effective in controlling gray leaf spot in pepper with E. asburiae (KNUC5007) and E. cancerogenes (KNUC5008 and KNUC5010) having the highest efficacy in reducing gray leaf spot severity. This is the first report of the biological control of gray leaf spot in pepper using rhizobacteria and it is hoped that this study will increase the utilization of Enterobacter species as plant growth promoters and biocontrol agents.