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최근 벼 흰잎마름병의 레이스 분포양상 및 저항성 유전자원 검정을 위한 혼합 균주
강미형 ( Mi Hyung Kang ),노태환 ( Tae Whan Noh ),이봉춘 ( Bong Choon Lee ),김상민 ( Sang Min Kim ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2015 농업생명과학연구 Vol.46 No.2
Bacterial leaf blight(BLB) caused by Xanthomonas oryzae pv. oryzae(Xoo) is a major disease in Rice production. Even though the cultivation of resistant varieties to BLB has been considered one of the ways to control that disease, the problem of this strategy is that resistance can be broken because of new pathogen races being emerged against resistant varieties. Therefore, it is necessary to establish countermeasures to prevent breakdown of rice genetic resistance. Investigations on the distribution and discrimination of race and the first date of BLB incidence in rice fields were conducted as well as representative combinations of mixed-strains were selected for various resistant test to be used on IRBB germplasm for resistance to BLB. The first symptom of BLB spreading rapidly was founded on mid July in Jeonnam province and on early August in Jeonbuk province except for Buan where BLB observed on late July. The occurrence area was 2,345ha in 2012, 5,253 ha in 2013, and 11,677 ha in 2014, showing increasing in incidence over the year. K3 race was dominant from 2012 to 2014 and also showed increased dominance rate from 59.2% to 83.3% in 2012 and 2014, respectively. Most tested strains could infect IR24 and Milyang 23, but no strains could infect IRBB5 and IRBB7 known as resistant variety. Combination 2, 3, 5, 7, 8, and 9 showed strong infectivity on many genetic resources. IRBB 5 and IRBB 7 showed moderate resistance to Combination 12 and IRBB 5 and IRBB 21 showed moderate resistance to Combination 6 and 10.
신간척지 새만금 토양에서 분리한 미생물의 동정 및 이용성 검정
강미형 ( Mi Hyung Kang ),노태환 ( Tae Whan Noh ),심형권 ( Hyeong Kwon Shim ),최만영 ( Man Young Choi ),이휘종 ( Hwi Jong Lee ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2014 농업생명과학연구 Vol.45 No.2
Soil microbes were isolated and identified in newly constructed reclaimed land, ‘Saemangum’ and characteristics of isolates were also examined for agricultural use. 82 and 93 isolates from rhizosphere and endophyte of native plant were collected from new reclaimed land soil. Most isolates were selected from glass wort plants and only few strains could be archived from other salt plant such as sea-blite and spergularia marina griseb. 103 isolates were appeared antibiotics ability against major pathogens include bakanae 81isolates, scab 92 isolates, bacterial leaf blight 80 isolates, sheath blight 25 isolates and grain rot 80 isolates. Among those isolates, 28 isolates which were shown strong antibiotic ability, were selected and identified Bacillus sp. by using 16S rDNA sequence and fatty acid analyze.
강미형 ( Mi Hyung Kang ),정동춘 ( Dong Chun Cheong ),최창학 ( Chang Hak Choi ),임회춘 ( Hoi Chun Lim ),송영주 ( Young Ju Song ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2012 농업생명과학연구 Vol.43 No.2
Powdery mildew of gypsophila and statice caused by Oidium sp. is the most serious disease for cut-flower quality in subalphine area, Jeonbuk. This study was carried out to control powdery mildew of gypsophila and statice by biocompatible products. The effects of Sodium bicarbonate, polyoxyethylene sorbitanmonolaurate (tween #20), cooking oil with egg yolk, milk, biofungicides, and surfactant were investigated on Gypsophila paniculata cv. ‘bristol fairy’ and statice (Limonium hybrida cv. ‘ocean blue’) to compare with fenarimol (WP). Among these tested materials, the mixture of sodium bicarbonate with tween #20 was the most effective suppressed powdery mildew on gypsophila and statice. Each application of tween 20 and cooking oil with egg yolk also effectively control powdery mildew on gypsophila and statice. The biofungicides were less effective than fenarimol in gypsophila. These tested chemicals did not cause any toxic effects or residual problems in leaves and stem. It is indicated that a mixture of sodium bicarbonate and tween 20, and cooking oil with egg yolk treatment is a suitable substitutes to control powdery mildew of gypsophila and statice.
콩 유묘 부패를 일으키는 종자전염성 세균의 동시 검출을 위한 duplex PCR법 개발
강미형 ( Mi Hyung Kang ),노태환 ( Tae Whan Noh ),심형권 ( Hyeong Kwon Shim ),최만영 ( Man Young Choi ),이휘종 ( Hwi Jong Lee ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2014 농업생명과학연구 Vol.45 No.2
Duplex PCR primers were developed for simultaneous detection of the important soybean seed pathogenic bacteria Xanthomonas axonopodis pv. glycines (Xag) and Pectobacterium carotovorum subsp. carotovorum (Pcc) which cause highly loss of yield and decreased quality of seeds in order to eliminate infected soybean seeds with these pathogen. Two specific primer pairs, Xag F1/R1 and Pcc F/R, were designed from the sequences of glycinecin A gene of Xag and carotovoricin gene of Pcc for certain identification of Xag and Pcc, respectively, in order to distinguish contaminated seeds with pathogens. A duplex PCR method for simultaneous identification and detection of Xag and Pcc was developed by amplifying both 401bp and 227bp bands. Identification of Xag and Pcc were done in the sensitivity of 2pg and 20pg, respectively. This approach can be used to exclude infected soybean seeds which act as soft rot inoculum of soybean seedling.
강미형 ( Mi Hyung Kang ),정동춘 ( Dong Chun Cheong ),최창학 ( Chang Hak Choi ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2009 농업생명과학연구 Vol.40 No.2
This study was carried out to identify the pathogens and determine the seasonal occurrence of major diseases of cut flowers growing in subalphine regions in Unbong, Jeonbuk in 2005 and 2006. Disease including phytophthora root rot, stem rot, fusarium wilt and powdery mildew occurred in Gypsophila paniculata. In G. paniculata, fusarium wilt has occurred from late April to May and phytophthora root rot was begun from early June in 2006 and increased until harvesting the flowers, especially rapidly after rainfall during June to August. Statice diseases were anthracnose, gray mold, phytophthora root rot, stem rot and alternaria leaf spot. In phytophthora root rot and stem rot of G. paniculata and statice, the rate of disease incidence was higher the overwintered field than in the newly-planted field, and the rate increased significantly with the increase of the successive cropping system.
애멸구의 날개형태, 성별, 그리고 발육단계별 Rice stripe virus (RSV) 보독률과 이병률
이휘종,강미형,최만영,구현나,김길하,Yi, Hwi-Jong,Kang, Mi-Hyeong,Choi, Man-Young,Koo, Hyun-Na,Kim, Gil-Hah 한국응용곤충학회 2015 한국응용곤충학회지 Vol.54 No.4
Small brown planthopper (SBPH), Laodelphax striatellus, gives a lot of damage to the rice by insect vector of rice stripe virus (RSV). This study compared the RSV acquisition and infection rates according to wing form, sex, and life stage of SBPH. The RSV acquisition rate in macropterous and brachypterous was 60.7% and 63.1%, respectively. The RSV acquisition rate by sex was 61.9% in female and 52.2% in male. However, there was no difference in significance. The RSV acquisition rate of nymphs and adults was 51.2% and 58.7%, respectively. The RSV infection rate by wing form was 53.3.% in macropterous and 48.2% in brachypterous. According to life stage, nymphs was 38.2% and adults was 42.6%. There was no difference in significance. On the other hand, female and male of RSV infection rate was 50.5% and 22.3%, respectively. There was a significant difference. Additionally, developmental periods of SBPH by RSV infection, the longest when inoculated with RSV-infected SBPH in healthy rice, while the shortest when inoculated healthy SBPH in healthy rice. 애멸구(Laodelphax striatellus)는 rice stripe virus (RSV)의 매개충으로 벼에 큰 피해를 주는 해충이다. 본 연구에서는 애멸구의 장 단시형, 암 수, 약 성충에 대한 RSV 보독률과 이병률을 비교하였다. 애멸구의 장 단시형의 RSV 보독률은 각각 60.7%, 63.1%로 크게 차이는 없었다. 암 수에 대한 RSV 보독률은 각각 61.9%, 52.2%로 암컷의 보독률이 더 높았으나 유의성은 없었다. 약 성충의 보독률을 비교한 결과 각각 51.2%, 58.7%로 역시 크게 차이가 나지는 않았다. RSV에 감염된 애멸구에 노출된 건전한 벼의 이병률은 장시형은 53.3%, 단시형은 48.2%를 보였으며, 약 성충의 이병률은 각각 38.2%, 42.6%를 보여 유의성은 없었다. 반면 암컷은 50.5%의 이병률을 보이고 수컷은 22.3%의 이병률을 보여 암컷이 수컷에 비해 22.3% 이병률이 높아 유의성이 있었다. 또한 벼와 애멸구의 RSV 감염여부에 의한 애멸구의 발육기간은 건전한 벼에 RSV 감염 애멸구를 접종 했을 때 가장 긴 것으로 나타났으며, 건전한 벼에 건전한 애멸구를 접종 했을 때 발육기간이 가장 짧은 것으로 나타났다.
토양에서 분리한 곤충병원성세균 Bacillus thuringiensis 의 혹명나방과 벼애나방에 대한 실내살충효과검정 및 생물학적 특성에 미치는 영향
서미자,백채훈,강미형,이건휘,이두구,이규성,윤영남,유용만,Seo, Mi-Ja,Paik, Chae-Hoon,Kang, Mi-Hyung,Lee, Geon-Hwi,Lee, Du-Ku,Lee, Kyu-Seong,Youn, Young-Nam,Yu, Yong-Man 한국응용곤충학회 2009 한국응용곤충학회지 Vol.48 No.1
For biological control of larva of Cnaphalocrocis medinalis and Naranga aenescens do considerable damage to crops by folding and scraping the leaf tissue of rice, a large number of Bacillus thuringiensis isolates have been obtained from soil samples in Korea and the pesticidal activity was assayed against two insect pest species described above. Among 53 Bt isolates tested in bioassay, 18 and 13 isolates showed over 90% mortality against C. medinalis and N. aenescens, respectively. Some isolates (11 isolates including CAB141) presented dual activity against C. medinalis and N. aenescens. These isolates showed over 96% control effect in pest control in laboratory against larvae of C. medinalis. Also, it was investigated that pupation, pupal length, and adult emergence of larvae exposed to Bt suspension decreased. Especially, the pupal length of C. medinalis after being fed corn seedling leaves treated Bt suspension for 10 days, were much smaller than that of control. 벼에 발생하여 잎을 가해하여 피해를 주는 혹명나방(Cnaphalocrosis medinalis)과 벼애나방(Naranga aenescens)의 곤충병원성미생물을 이용한 친환경적 방제를 위해, 국내토양에서 분리된 Bacillus thuringiensis 균주들을 대상으로 생물검정을 수행하였다. 실험에 이용한 Bt 53균주 중, 약 18개 균주가 혹명나방에 90% 이상의 살충률을 나타내었고, 13개 균주가 벼애나방에 살충활성을 보였는데, 두 종 모두에 90% 이상의 살충률을 보이는 균주도 CAB141균주를 비롯해 11균주나 확인되었다. 이러한 균주들은 혹명나방에 대한 실내방제실험결과, 96%이상의 방제효과를 나타내기도 하였다. 또한 Bt 포자현탁액에 노출된 유충의 용화율, 용길이, 우화율이 감소되는 경향이 나타났는데, 혹명나방의 경우, 번데기 길이에서도 정상개체와 처리 후 생존개체가 현저한 차이를 나타내었다.
노태환 ( Tae Hwan Noh ),강미형 ( Mi Hyung Kang ),심형권 ( Hyeong Kwon Shim ),백채훈 ( Chae Hoon Paik ),최만영 ( Man Young Choi ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2012 농업생명과학연구 Vol.43 No.2
We developed bacteria pure isolation method for Bacterial grain rot of rice caused by Burkholderia gumae from diseased rice seeds. In the result by these methods, the bacteria were distributed as 11 isolates (55%) in brown rice, 9 isolates (45%) inner hull and 2 isolates (10%) outer hull among 20 isolated collections, respectively, however 65% of saprophytic bacteria were isolated form outer hull. This result suggested that most of the pathogen exist in brown rice and inner hull. In PCR identification with the B. glumae specific primer, Ogf4 and Ogr3, it was confirmed that all 54 expected isolates were identified as the pathogen, however, for 21 other bacteria were the amplification by the PCR were failed. In conclusion, using diseased seeds and KB medium the rapid and simple identification to the bacterial grain rot pathogen B. glumae.