• Mycobiology
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• 제31권3호
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• pp.173-178
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• 2003

India has maximum genetic materials in early cauliflower, which grow in subtropical conditions. Different disease parameters like linear growth, maximum growth rate per day, AUDPC, apparent infection rate and percent diseased area were calculated in artificially inoculated plants. Apparent infection rate is not co-related with the black rot disease incidence and should never be considered during characterization of disease resistance and varietal screening. Based on the above disease parameters Kunwari-18, Phool Gobhi Kunwari, Kataki-7 and BT-10-2 were selected as moderately resistance to black rot in early cauliflower. These lines can be used for black rot prone area and also for black rot disease improvement programme. Considering the qualitative and quantitative parameters, slow rotting resistance cauliflower lines are selected as such for cultivation and would be best suited in integrated disease programme.

• 대한약학회:학술대회논문집
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• 대한약학회 2001년도 Proceedings of International Convention of the Pharmaceutical Society of Korea
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• pp.132.1-132.1
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• 2001

• 한국연초학회지
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• 제24권1호
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• pp.27-31
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• 2002

Three kinds of inoculation methods, capillary, root cutting and dipping were compared for an efficient way to screening the resistant tobacco variety against bacterial wilt, Ralstonia solanacearum. The pricking a capillary tube contained the pathogenic bacterial suspension(10$^{7}$ cfu/$m\ell$) to an axillary bud of each tobacco plant showed different resistance well between varieties. The less period was required in inoculating work and in disease development for the inoculation method used with capillary tube than for two other inoculation methods tested also.

• The Plant Pathology Journal
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• 제31권1호
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• pp.12-24
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• 2015

Rice Blast is the most devastating disease causing major yield losses in every year worldwide. It had been proved that using resistant rice varieties would be the most effective way to control this disease. Molecular screening and genetic diversities of major rice blast resistance genes were determined in 192 rice germplasm accessions using simple sequence repeat (SSR) markers. The genetic frequencies of the 10 major rice blast resistance genes varied from 19.79% to 54.69%. Seven accessions IC337593, IC346002, IC346004, IC346813, IC356117, IC356422 and IC383441 had maximum eight blast resistance gene, while FR13B, Hourakani, Kala Rata 1-24, Lemont, Brown Gora, IR87756-20-2-2-3, IC282418, IC356419, PKSLGR-1 and PKSLGR-39 had seven blast resistance genes. Twenty accessions possessed six genes, 36 accessions had five genes, 41 accessions had four genes, 38 accessions had three genes, 26 accessions had two genes, 13 accessions had single R gene and only one accession IC438644 does not possess any one blast resistant gene. Out of 192 accessions only 17 accessions harboured 7 to 8 blast resistance genes.

• 한국응용곤충학회지
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• 제33권4호
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• pp.230-236
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• 1994

실내에서 사육한 점박이응애(Tetranychus urticae Koch)의 감수성계통(S)을 유기염소계 살비제안인 dico-fol을 공시하여 인위적으로 도태선발하여 저항성 발달과 저항성 유전을 조사하고, 교차저항성 유무를 검토하였다. Dicofol을 150회 처리하여 얻은 선발계통($R_d$$LC_{50}$값이 27.5배증가하였다. 감수성계통과 저항성계통의 상호교배에서 얻어진 $F_1$ (R♀, XS♂, R♂, XS♀)은 농도와 사망률 관계에서 감수성 차이가 있었다. 또 $F_1$ (R♀, XS♂, R♂, XS♀)의 우성도는 암컷성충에서 각각 -0.29, -0.72, 수컷성충에서 각각 -0.42, -0.93로 나타났다. 따라서 dicofol 저항성 유전자는 불완전열성에 의해 지배되는 것으로 판단되었다. $R_d$ 계통 은 아미트라즈계인 amitraz에 대해서 높은 교차저항성을 나타내었고, 또한 pyethroid 계 살비제인 acrinathrin, bifenthrin에 대해서도 교차저항성을 나타내었다. Abamectin, chlofenson, clofente-zine, cyhexatin, fenbutation oxide, fenpyroximate, hexythiazox, monocrotophos, propargite, tetradifon에 대해서는 비교차저항성을 나타내었다. 한편 유기주석계인 azocyclotin과 fenbutatin oxide에 대해서느 역상관교차저항성을 나타내었다.

• Journal of Plant Biotechnology
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• 제45권3호
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• pp.217-227
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• 2018

Gummy stem blight (GSB) is one of the most destructive and economically important, soil borne diseases of melon caused by the ascomycete fungus, Didymella bryoniae throughout the world. In Korea, however, no GSB resistant genotype has been reported yet. The study aimed to identify GSB resistant melon germplasm. We screened a total of 60 genotypes including 16 lines and 44 melon cultivars collected from USA and Korea. Among the 16 melon lines, four lines including 'PI482399', 'PI140471', 'PI136170' and 'PI420145', and two Korean cultivars viz. 'Asia Papaya' and 'Supra' showed complete resistance. We were aware that both genotypic and environmental variations could influence the phenotypic screening of resistance and susceptibility. We therefore, further assessed all genotypes using 20 SSR markers. The SSR marker 'CMCT505' linked to Gsb1 in chromosome 1 perfectly grouped resistant and susceptible lines indicating that resistance is probably due to the presence of Gsb1 gene. Cloning and sequencing of resistant and susceptible Gsb1 amplicons showed that there were 32-bp deletions in resistant line and 39-bp deletions in resistant cultivar compared to susceptible one. Thus, the resistant melon lines and cultivars identified in this study could be recommended for the melon breeding program. Furthermore, the SSR marker 'CMCT505' which is tightly linked with Gsb1 could be used for molecular screening of melon germplasm.

• 한국응용곤충학회지
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• 제34권1호
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• pp.61-64
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• 1995

점박이응애(Tetranychus urticae Koch)의 감수성계통(S)과 dicofol 저항성계통(R)을 공시하여 dicofol저항성의 안정성을 조사하였다. Dicofol 저항성계통(저항성비 23.0)의 약제도태없는 조건하에서 사육된 암컷성충의 dicofol에 대한 저항성 수준은 1년이 경과된 후에도 변화가 없었다. 그러나 1년 이후부터는 감소하기 시작하여 2년째에는 저항성비가 15.8배, 3년째에는 10.7배로 감수성쪽으로 기울었다. 점박이응애의 dicofol 저항성계통과 감수서계통의 상호교배 $(R_{female}\timesS_{male},R_{male}\times S_{female})$에서 얻어진 세대별 약제 감수성도 세대가 경과됨에 따라 감수성쪽으로 기울었다.

• The Plant Pathology Journal
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• 제36권6호
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• pp.558-569
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• 2020

Fusarium head blight (FHB) is a devastating fungal disease of wheat (Triticum aestivum L.). The lack of genetic resources with stable FHB resistance combined with a reliable and rapid screening method to evaluate FHB resistance is a major limitation to the development of FHB resistant wheat germplasm. The present study utilized an immature wheat spike culture method to screen wheat spike culture derived variants (SCDV) for FHB resistance. Mycotoxin concentrations determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS) correlated significantly (P < 0.01) with FHB severity and disease progression during in vitro spike culture. Selected SCDV lines assessed for FHB resistance in a Fusarium field disease nursery in Carman, Manitoba, Canada in 2016 showed significant (P < 0.01) correlation of disease severity to the in vitro spike culture screening method. Selected resistant SCDV lines were also crossed with an elite cv. CDC Hughes and the progeny of F₂ and BC₁F₂ were screened by high resolution melt curve (HRM) analyses for the wheat UDP-glucosyl transferase gene (TaUGT-3B) single nucleotide polymorphism to identify resistant (T-allele) and susceptible (G-allele) markers. The progeny from the crosses were also screened for FHB severity using the immature spike culture method and identified resistant progeny grouped according to the HRM genotyping data. The results demonstrate a reliable approach using the immature spike culture to screen for FHB resistance in progeny of crosses in early stage of breeding programs.

• Archives of Pharmacal Research
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• 제21권1호
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• pp.62-66
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• 1998

The resistance inhibitory activities of 54 odorant mixtures (essential oil) from 41 Korean aromatic herbs were tested against multi-drug resistant Staphylococcus aureus SA2, which has resistances to 10 usual antibiotics including chloramphenicol. As results, combinations of 28 kinds of samples from 21 herbs and chloramphenicol have resistance inhibitory activities in dose dependent manner.

• Journal of Crop Science and Biotechnology
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• 제11권4호
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• pp.269-276
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• 2008

Field resistance is defined as the resistance that allows effective control of a parasite under natural field condition and is durable when exposed to new races of that parasite. To identify the genes for field resistance to rice blast, quantitative trait loci (QTLs) conferring the resistance for races and blast nursery screening in japonica rice cultivars were detected and mapped using SSR markers. QTL analysis was carried out in 190 RILs population from the cross between Suweon365 (moderately resistant) and Chucheong (highly susceptible). Twelve QTLs against nine blast races inoculated were detected on chromosomes 1, 2, 4, 6, 7, 11 and 12. They explained from 5.1% to 34.9% of total phenotypic variation. Eight QTLs against blast nursery screening in four regions for three years were detected on chromosomes 1, 2, 4, 11 and 12. The phenotypic variation explained by each QTL ranged from 4.3% to 37.7%. Three chromosome segment substitution lines (CSSLs) of $BC_2F_6$ by backcross method were developed to transfer the QTLs into the susceptible cultivar Chucheong as a recurrent parent. A CSSL4-1 containing two QTLs qLB6.2 and qLB7 against blast races showed to the reaction of 6 to 7 at blast nursery in two regions for two years. The CSSL4-2 and CSSL93 containing QTLs, qLB11.2 and qLB12.1 of the resistance against leaf blast in blast nursery screening, respectively, had enhanced the resistance for blast nursery screening across two regions and in two years.