• Korean Journal of Plant Resources
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• v.22 no.6
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• pp.518-521
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• 2009

High productivity of ginger (Zingiber officinale Roscoe) was obtained from the rhizome produced by shoot-tip culture with Korean native variety, Seosanjong. Seed rhizomes induced by shoot-tip culture were successfully established in the field. The rhizomes induced by both plant or rhizome were higher in emergence rate and faster in days to emergence than those of home seed production. The seed rhizome production induced by shoot-tip culture was two times heavier than that of home seed production. These results suggest that shoot-tip culture might be one of mass propagation methods in seed rhizome of ginger plant.

• Korean Journal of Plant Resources
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• v.2 no.1
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• pp.235-241
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• 1989

The study was conducted to determine the Ms orthogonaL modia and the concentration of plant growth regulator for seed matura-tion and growth of rhizome from Cymbidium goeringii Germination waswell in dark condition, but the growth of rhizome was better un-der dark than under light condition in MS orthoTonal . Sucrose con-centration( 3 %) gave better results than higher ones(6%), andthe use of NAA(0.1 PPm) effect significant difference of seed ge-rmination .But the growth of rhizome was best in medium Containingsucrose concentration(3%) Ippm NAA and 1 PPm BA.

• Korean Journal of Medicinal Crop Science
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• v.26 no.5
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• pp.354-361
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• 2018

Background: This study was conducted to investigate the growth characteristics, root yield and curcuminoid content of turmeric (Curcuma longa L.), cultivated using mother seed rhizomes (MR) and finger seed rhizome (FR) of different sizes. MR are attached to the stem, and FR are connected to the MR, and are used as a general seed rhizome. Methods and Results: Seed rhizomes of different types and sizes were used: large, medium and small for FR, and large, half-sized, and small for MR. These were assigned to the experimental groups and cultivated under greenhouse conditions. The growth characteristics, root yield, and curcuminoid content did not show clear difference between MR and FR, but suggest that the larger seed rhizomes (above 30 g) could have higher root yields. On average, harvested mother rhizomes (HMR) contained more curcuminoid than harvested finger rhizomes (HFR), while the yield of HFR was higher than that of HMR. The higher weight of harvested roots correlated significantly with elevated curcuminoid content. Conclusions: The two seed rhizomes, MR and FR, did not differ in root yield and curcuminoid contents, but larger seed rhizomes may produce better root yields. This suggest that the optimum seed rhizome is larger FR, to produce higher yields and quality in turmeric root production.

• Journal of Bio-Environment Control
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• v.32 no.3
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• pp.210-216
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• 2023

Conventionally, the seeds of Rehmannia glutinosa (Gaertn.) Libosch. ex Steud. have been directly sown at the field without using the plug seedling method. Plug seedlings have the advantage of promoting germination and convenient transplanting. However, there is little information about propagation of R. glutinosa using the plug seedling method. This study was conducted to investigate the optimal seed rhizome length, diameter, and sowing direction of R. glutinosa for establishing the plug seedling method. Seed rhizome length and diameter were separated by 1, 2, 3 cm and 0.3-0.5, 0.6-1.0, 1.1-1.5 cm, respectively. And seed rhizomes were sown in vertical and horizontal directions. The survival rate in 1 cm length of seed rhizomes was lower than in other treatments. The leaf length, leaf width, number of leaves, SPAD, leaf area, and fresh and dry weights of shoot and roots were the greatest in 3 cm length of seed rhizomes. As the seed rhizome diameter decreased, the growth characteristics of R. glutinosa tended to increase. When R. glutinosa was sown horizontal direction, the leaf length, leaf width, number of leaves, and leaf area were significantly higher than in the vertical direction. In conclusion, when sowing seed rhizome in a plug tray, using a length of 3 cm, a diameter of less than 1 cm, and sowing in a horizontal direction is considered an appropriate sowing method for R. glutinosa.

• Asian-Australasian Journal of Animal Sciences
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• v.19 no.5
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• pp.690-694
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• 2006

There is limited information on the relationship between defoliation and root and rhizome development of kura clover (Trifolium ambiguum M. Bieb.). To determine the effects of defoliation severity on root and rhizome growth of young kura clover plant (seedling about 8 wk old), this research was conducted in 2002 (Experiment 1) and 2003 (Experiment 2) in a glasshouse at the University of Wisconsin-Madison. Four kura clover entries were used in this experiment: two were started from seed materials (ARS-2678 and 'Rhizo') and two were clones from mature, field-grown Rhizo kura clover plant. Three defoliation frequencies (2-, 4- and 6-wk intervals) and two defoliation intensities (complete and partial defoliation) were imposed on each of the four kura clover entries. Root, rhizome, and leaf dry matter (DM) generally increased with less frequent defoliation, however, the increase in rhizome DM was not significant between 4- or 6-wk defoliation periods. The root and leaf DM under complete defoliation (CD) were significantly lower than under partial defoliation (PD). In Exp. 1, rhizome DM was not significantly different between CD and PD; it was significantly lower under CD in Exp. 2. ARS-2678 showed excellent root development characteristics, however, its rhizome DM was significantly lower than Rhizo clones. The rhizome development from Rhizo clones was greater than that from seed materials. If maximum root and rhizome growth are expected from young kura clover plant, the intensity and frequency of defoliation should be minimized or defoliation should be avoided.

• Korean Journal Plant Pathology
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• v.14 no.5
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• pp.484-490
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• 1998

Microorganisms associated with seed-rhizome rot of gingers preserved in three underground storage caves were identified with respect to rot types. Rot patterns were grouped into 4 different types : yellow soft rot, brown rot, localized ring rot, and water-soaked rot. Water-soaked rot was highest in frequency with 40% and ring rot the least with 14%. Causal pathogens differed with rot type, yellow soft rot by Erwinia carotovora and Pseudomonas aeruginosa, brown rot by Fusarium solani and Pseudomonas aeruginosa, localized ring rot by F. solani, and water-soaked rot by Pythium spinosum and P. ultimum. Pythium myriotylum, the causal pathogen of ginger rhizome rot which occurs severely in fields was rarely detected from storage seed-rhizomes suggesting its minor involvement with storage rot. Pathogenic Pythium isolates were frequently obtained from both rhizome surface and inner tissues of rotten rhizomes. Detection frequency of Pythium isolates in inner tissues decreased as increasing distance from rhizome surface. In wound-inoculation tests, above pathogens caused a varying degree of rot on healthy rhizomes at 15$^{\circ}C$, 2$0^{\circ}C$ and 3$0^{\circ}C$ with increasing severity at higher temperatures.

• Korean Journal of Medicinal Crop Science
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• v.21 no.5
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• pp.334-341
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• 2013

Studies were carried to evaluated the influence of storage method by temperatures and fillers on yield and quality of seed rhizome in turmeric. Seed rhizome was stored at styrofoam box filled with rice hull and sand (3:1) or vermiculite for 30, 60 and 90 days at different temperatures (5, 10 and $15^{\circ}C$. compared to traditional method (rhizome only). Parameters were obtained for weight loss, cold injury, percentage of decayed in stored rhizome during storage periods. Also, the germination, growth pattern and yield from stored rhizome has been investigated. It was confirmed that storage of turmeric in stored with filled with vermiculite helps in prevention of rhizomes from microbial and fungal attack. The storage of rhizomes in styrofoam box without any filler at low temperature below $10^{\circ}C$. is not advocated due to heavy losses weight and decayed in management of postharvest for turmeric rhizome. Germination percentage, growth pattern and yield was maximum for rhizomes stored at styrofoam box filled with vermiculite for 90 days at $15^{\circ}C$. The paper outlines a brief attempt to assess the efficacy of non-chemical methods including optimal storage method (temperature and filler) of control of decay and moisture losses during storage of turmeric.

• Korean Journal of Agricultural Science
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• v.26 no.1
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• pp.1-5
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• 1999

This experiment was carried out to define the development of control method against rhizome rot of ginger. It was difficult to control of rhizome rot of ginger completely by way of only rhizome sterlization. When soil were stenilized with dazomet, and metalacxyl granule was applied, higher than 95% of control value as well as 39% of yield increase compared to control were found. Soil drenching with metalacxyl cupper oxychloride and streptomycin controlled the rhizome rot satisfactorily, but was inferior to the above mentioned combination.

• Research in Plant Disease
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• v.10 no.2
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• pp.87-93
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• 2004

Rhizome rot of ginger, caused by Pythium myriotylum, a major limiting factor for its production, has occurred annually, but become severe, especially in hot and humid years with frequent rainfalls in Korea. Most studies on rhizome rot have been carried out since 1980s in the National Institute of Agricultural Sciences and Technology, Honam Crop Experimental Station and Choongnam Provincial Rural Development Administration. Many aspects of rhizome rot, such as survey of the disease incidence, taxonomy, pathogenicity and physiology of pathogen, and ecology of soilborne inocula have been studied in the researches. However, intensive studies have been concentrated on management technologies of the disease including seed-rhizome disinfection, soil sterilization, evaluation of cultivar resistance, and fungicide application, and most developed technologies have been used in commercial farmings. In future, development of resistant varieties and simple soil disinfection technologies applicable in Korean condition and economically feasible fungicide application technology have to be developed for better management.

• Korean Journal of Medicinal Crop Science
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• v.26 no.4
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• pp.291-295
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• 2018

Background: The use of Rehmannia glutinosa of the family Scrophulariaceae, in traditional medicine is well known. This study was conducted to elucidate the effect of air curing of the seed rhizome of R. glutinosa on its storability and yield. Methods and Results: The root of the R. glutinosa cultivar (Dagang) was harvested in at the end of November. The seed rhizomes were air cured for one to seven days. They were subsequently wrapped with newspaper and further stored in a plastic container at $1^{\circ}C$. It was observed that the weight loss and decay rates were significantly lower in the air cured seeds than in the untreated ones. Moreover, the decay rate of the control was approximately 50%, 120 days after storage. However. the decay rate of all the air cured treatment groups was less than 1%. Additionally, air curing led to an increase in the germination rate of the seeds and the root yield when compared with the untreated groups. Taken together, the ideal treatment period for air curing was found to be 3 days. Under these conditions, the germination rate and yield were 88.7% and 2,185 ㎏/10a, respectively. Conclusions: This study successfully demonstrated that the air curing of seed rhizomes can lead to a considerable increase in the storability and yield of R. glutinosa.