• Journal of The Korean Society of Grassland and Forage Science
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• v.22 no.4
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• pp.247-252
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• 2002

“DK 537”has been selected by forage crop breeding team at the National Livestock Research Institute(NLRI), RDA and has been determined by the Deliberative Council of the National Agricultural Cooperative Federation(NACF) in 2002, as a new recommended hybrid which is early maturing, good quality and hi호 yield of corn for silage. The characteristics of this hybrid are as follows ; 1. The seed coat is yellow and the mean of tasseling date is 5th of July, included in early maturing hybrid which is one day delayed than check cultivar, DK 501. The culm length is 246cm. It is resistant to lodging because of its low height from surface to ear. 2. DK 537 shows resistance to H. maydis and Maize Black-Streaked Dwarf Virus(MBSDV). It also shows strength to corn borer as much as DK 501 does. 3. Fresh yield. dry matter yield. and TDN per a ha are 50 tons, 16.9 tons, and 11.4 tons respectively. which are almost same yielding level of DK 501. Its percent ear to total dry matter is 50.8% at the same time. Through all these tests, we could make sure at DK 537 hybrid will be recommended as good forage crop.

• Journal of The Korean Society of Grassland and Forage Science
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• v.17 no.2
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• pp.157-166
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• 1997

This study was carried out with aim to find out a tall fescue cultivar which is palatable and resistant to hot climate, and a white clover cultivar which is less competitive with other grasses. Pastures with 3 treatments (TI: Fawn, tall fescue + Regal, white clover + orchardgrass + perennial ryegrass, T2: Roa, tall fescue + Regal, white clover + orchardgrass + perennial ryegrass, T3 : Roa, tall fescue + Tahora, white clover + orchardgrass + perennial ryegrass) were established by oversowing. Under continuous grazing, dry matter yield, soil characteristics, botanical composition and nutrient contents of forages were investigated during the grazing seasons 60m 1994 to 1996. No significant difference were found in establishment percents, physical and chemical characteristics of soil, and nutrient contents of forages between 3 treatments(P>0.05). Dry matter yield of TI, T2 and T3 were 24,188, 23,827 and 23,578kg/ha, respectively. Fawn and Roa, tall fescue cultivars occupied 6.1 and 4.8% of the total plants in 1994, 14.4 and 11.5 % in 1995, and 28.4% and 17.7% in 1996, respectively. These results indicate that Fawn, tall fescue dominantly occupied with time more than Roa, tall fescue. There were no differences in percentage of Regal and Tahora, white clover cultivars(P > 0.05), showing 4.2 and 2.4% in 1994, 16.1 and 17.3% in 1995, and 2.4 and 1.0% in 1996, respectively. The percentage of orchardgrass on mixed pasture decreased after summer season of high temperature, but percentage of Roa, tall fescue slowly increased with time firom 1994 to 1996.

• Korean Journal of Agricultural Science
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• v.42 no.4
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• pp.299-304
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• 2015

This study was conducted to investigate growth characteristics to develop the technique to select resistant cultivar by wet injury at an early stage through the automatic irrigation maintaining 30, 20, 10 kPa respectively using native variety, Chunpoong, Yunpoong, Gumpoong and Sunun. The aerial growth was decreased at 10 kPa compared to 30 kPa. In addition, the survival rate was decreased by 66.6%, 62.3%, 33.8% at 30, 20, 10 kPa, respectively. The survival rate of Chunpoong and Gumpoong were higher than others at 10 kPa. While root growth characteristics such as root length, root weight, number of lateral root and side root were tended to decrease, root diam was no significant or increased. And the more humid condition is, the more the incidence rate of rusty root and rough skin were tended to increase. The epidermal thickness of Chunpoong and Gumpoong was increased but the figures of native variety, Yunpoong and Sunun were decreased at 10 kPa compared to 30 kPa. But, the tissue stiffness of root was decreased at 10 kPa compared to 30 kPa.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.55 no.4
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• pp.306-311
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• 2010

The multiplication and movement of Xanthomonas oryzae pv. oryzae in rice leaves of seven near-isogenic lines(NILs) derived from different genetic sources and from the susceptible cultivar Toyonishiki were examined. The bacterium populations increased rapidly in susceptible cultivar leaves of the inoculation sites but increased gradually in NIL leaves. X oryzae pv. oryzae were detected at 20cm above the leaves of the inoculated sites in IRBB 103 and Toyonishiki but were not detected in the other NILs at 25 days after inoculation. These results support that resistant genes restrict bacterial movement not multiplication.

• The Plant Pathology Journal
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• v.32 no.1
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• pp.25-32
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• 2016

Potato is one of the most important crops worldwide. Its commercial cultivars are highly susceptible to many fungal and bacterial diseases. Among these, bacterial wilt caused by Ralstonia solanacearum causes significant yield loss. In the present study, integrated proteomics and genomics approaches were used in order to identify bacterial wilt resistant genes from Rs resistance potato cultivar CT-206-10. 2-DE and MALDI-TOF/TOF-MS analysis identified eight differentially abundant proteins including glycine-rich RNA binding protein (GRP), tomato stress induced-1 (TSI-1) protein, pathogenesis-related (STH-2) protein and pentatricopeptide repeat containing (PPR) protein in response to Rs infection. Further, semi-quantitative RT-PCR identified up-regulation in transcript levels of all these genes upon Rs infection. Taken together, our results showed the involvement of the identified proteins in the Rs stress tolerance in potato. In the future, it would be interesting to raise the transgenic plants to further validate their involvement in resistance against Rs in potato.

• Plant Biotechnology Reports
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• v.3 no.4
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• pp.317-324
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• 2009

The insecticidal toxin gene of Bacillus thuringiensis (Bt) is one of the most commonly used in the development of genetically modified (GM) crops. In this research, we analyzed Bt rice showing lepidopteran pest-resistance. The Bt gene is a synthetic Cry1Ac composed of optimal codons for plants, and the Bt protein is targeted to the chloroplast by a transit peptide. Three Cry1Ac rice events (C103-3, C127-1, and C7-1) were analyzed for molecular characterization. C103-3 contains two copies of T-DNA where the left border (LB) region is truncated. Both C7-1 and C127-1 have a single copy of T-DNA, but a part of the vector backbone DNA is inserted into the genome of C127-1; thus, only C7-1 had intact T-DNA. Progenies of C7-1 crossed with the original cultivar, Nakdong, and double-haploid lines from anther culture of lines crossed with the elite cultivar, Dongjin, were analyzed for T-DNA flanking genomic DNA and genotyping. Results showed that an intact T-DNA region without the vector backbone was inserted into the genome and was stably inherited through generations. The C7-1 homozygous event could be used as breeding material to develop GM rice with pest resistance.

• Journal of Microbiology
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• v.44 no.3
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• pp.363-368
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• 2006

In this study, native Byadyrhizobium strains were isolated from the host plant, Glycine max, harvested from fields in Madhya Pradesh, India, and were typed by Iytic rhizobiophages. Eight indigenous (Soy2, ASR011, ASR031, ASR032, MSR091, ISR050, ISR076 and ISR078) and two exotic strains (USDA123 and CB1809), all of which evidenced a distinct reaction with six phages, were employed in this study. The symbiotic interaction of these strains was studied initially using soybean cultivar JS335 in a sand culture in a controlled environment, and the efficiency was assessed based on the nodule number, nodule dry weight, plant dry weight, nitrogenase activity, and total accumulation of N per plant. Symbiotic effectiveness was found to be highest with the native phage-sensitive isolate ASR011, whereas it was at a minimum with the phage-resistant isolates, ISR050 and ISR078. Additionally, the effectiveness of these strains was evaluated using six soybean cultivars belonging to different maturity groups; namely, Brags, Lee, Pusa20, PK416, JS33S and NRC37. Analysis of variance data evidenced significant differences due to both symbionts, for the majority of the tested parameters. The CB1809, USDA123, and ASR011 strains evidenced relatively superior symbiotic effectiveness with soybean cultivars Brags, Lee and JS335. Strain ISR078 evidenced no significant responses with any of the cultivars. The ASR031 strain performed moderately well with all tested cultivars. The symbiotic response of all the strains was quite poor with cultivar PK416. Our studies showed that a significant relationship existed between the phage sensitivity and symbiotic efficiency of the bacterial strains with the host-cultivars.

• Journal of Korean Society of Forest Science
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• v.27 no.1
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• pp.1-4
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• 1975

Freezing resistance of apple (Malus pumila) cultivars was measured to find out the most cold hardy apple variety among the five cultivars which are promissing in Korea. The measurement of freezing resistance for two varieties of dwarf interstock, was also included to compare the cold hardiness among scions and interstocks. The freezing resistance was in order from lowest to highest; winter bud, cambium, xylem ray parenchyma and bark cortex in all cultivars except EM26. The difference in cold hardiness among cultivars and interstocks was not consistent among tissue parts of twig except in cultivar Nugget-spur of which all tissue parts showed least cold hardiness. The difference among tissue parts with in a cultivar was discussed in terms of choosing the most cold hardy, and the most resistant cultivars to late frost damage.

• Research in Plant Disease
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• v.12 no.2
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• pp.75-80
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• 2006

Crown gall on rose was observed in greenhouse during year 2003-2005. The disease incidence was up to 28.3% and the disease was the severer in hydrophonics culture than that in soil. The typical gall symptom occurred mainly on the root and crown resulting in poor foliage, stunting, and fewer blossoms. Sixty-three rose cultivars were inoculated with Agrobacterium. tumefaciens isolated from rose crown gall, to evaluate rose cultivar-specific resistance. The size of galls from inoculated rose stems was measured in a greenhouse test. Tumors formed in almost varieties of rose inoculated. Based on the frequency of tumor occurrence and weight of galls formed on the stem of rose, it was shown that 'Little Marble', 'Golden Gate' and 'Rosa Rox-ette' were extremely susceptible to crown gall. Some varieties such as 'Little Silver' appeared to be resistant to the crown gall.

• Korean Journal of Breeding Science
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• v.40 no.2
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• pp.184-187
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• 2008

A new early maturing satsuma mandarin (Citrus unshiu Marc.) 'Haryejosaeng' was developed as a nucellar seedling selection of 'Tachima Wase' (C. unshiu Marc.) that was crossed with C. natsudaidai Hayata at the National Institute of Subtropical Agriculture in Jeju island in 1992. The 'Jegam ga No. 2', a first selection from the seedlings fruited in 2001 was finally named "Haryejosaeng" through field evaluation trials at three locations in Jeju island from 2003 to 2004. 'Haryejosaeng' produces seedless fruit maturing in early November, and has higher soluble solids and lower acidity than 'Miyagawa Wase', the leading early-maturing satsuma mandarin cultivar in Jeju island. Fruit weight is moderate at about 80~90 g and its shape is compressed-oblate globose with a light orange color. The rind thickness of about 2 mm provides easy peeling. The flesh shows light orange colored and contains 10 to 11 Brix and 1 to 1.1% acidity when mature. Tree shows vigorous growth and spreading thornless twigs. Alternate bearing is similar to 'Miyagawa Wase'. 'Haryejosaeng' is susceptible to citrus scab disease and melanose, but resistant to citrus canker.