• 제목/요약/키워드: bacterial blight.

검색결과 358건 처리시간 0.034초

환상박피와 비가림 시설을 이용한 참다래 꽃썩음병의 경종적 방제 (Cultural Control of Bacterial Blossom Blight Using Trunk Girdling and Rainproof Installation over Kiwifruit Trees)

  • 신종섭;박종규;김경희;정재성;허재선;고영진
    • 식물병연구
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    • 제10권4호
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    • pp.304-309
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    • 2004
  • 참다래 과수원에서 환상박피와 비가림시설은 꽃썩음병을 효과적으로 경감시켜주는 것으로 밝혀졌다. 참다래 개화기 약 45일 전인 4월 10일경에 참다래 주간부위에 20${\sim}$30 mm 폭으로 환상박피를 하면 꽃썩음병을 효과적으로 예방할 수 있었는데, 주간부위의 환상박피 높이는 방제효과에 영향을 미치지 않았다. 비닐을 이용한 비가림시설은 파풍망시설보다 비가림방식에 관계없이 꽃썩음병 예방에 효과적이었다. 참다래 개화기 약 75일 전인 3월 10일경에 부분비닐피복식 비가림시설을 하면 참다래 꽃썩음병의 발생을 거의 완벽하게 방제할 수 있었다. 환상박피와 부분비닐피복식 비가림시설은 참다래 과수원에서 환경친화적인 꽃썩음병 방제방법으로 실용화할 수 있을 것으로 기대된다.

Halo Blight of Kudzu Vine Caused by Pseudomonas syringae pv. phaseolicola in Korea

  • Jeon, Yong-Ho;Chang, Sung-Pae;Kim, Sang-Gyu;Kim, Young-Ho
    • The Plant Pathology Journal
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    • 제22권2호
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    • pp.119-124
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    • 2006
  • Kudzu vine(Pueraria montana var. lobata) is an invasive climbing woody vine that envelops trees and shrubs, pressing physically and shutting out sunlight, which needs to be controlled. Kudzu vine pathogens were surveyed as a way to seek its biocontrol agents in 2002. Occurrence of a bacterial halo blight disease of kudzu vine was observed at several localities in Korea including Euiwang and Suwon in Gyeonggi Province, Daejon, and Gochang and Buan in Jeonbuk Province. Symptoms of brown to black spots with a surrounding yellowish halo appeared from June and lasted till the rainy season without much expansion, but accompanying often leaf blight and defoliation. Isolated bacteria were identified as Pseudomonas syringae pv. phaseolicola based on physiological and cultural characteristics, Biolog, fatty acid and 16S rDNA sequencing analyses. In artificial inoculation test, these bacteria produced the same halo spot symptoms on kudzu vine and bean plants. They also induced hypersensitive responses (HR) on tobacco, tomato, and chili pepper leaves. This is the first report of a bacterial disease of kudzu vine in Korea, and the bacterial pathogen can be used as a biocontrol agent against the pest plant.

Xanthomonas axonopodis pv. phaseoli와 X. axonopodis pv. phaseoli var. fuscans에 의한 팥의 세균성잎마름병 (Bacterial Common Blight and Fuscous Blight of Small Red Bean caused by Xanthomonas axonopodis pv. phaseoli and X. axonopodis pv. phaseoli var. fuscans)

  • 이승돈;이정희;문중경;허성기;나동수
    • 식물병연구
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    • 제12권2호
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    • pp.129-133
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    • 2006
  • 2003년 수원의 팥 재배 포장에서 새로운 병해가 발견되었다. 처음에는 잎에서 수침상 점무늬가 형성되고 점점 커져 주위로 노란색의 테두리를 형성하는 진갈색의 반점을 형성한다. 심해지면 잎이 떨어지고 잎자루 및 꼬투리에도 진갈색의 병반이 형성된다. YDC 배지에서 병원세 균을 순수 분리하였을 때 Xanthomonas속 세균의 전형적인 특징인 노란색 색소를 띤 세균이 형성되었다. 분리된 세균을 $10^8 cfu/ml$로 현탁한 후 3 주 동안 자란 팥과 콩에 분무 접종하여 병원성을 확인하였다. 지방산 조성 및 함량과 다양한 탄소원 이용정도를 이용하여 분리세균 SL4311은 X. axonopodis pv. phaseoli로 SL4309와 SL4310 은 X. axonopodis pv. phaseoli var. fuscans로 동정하였으며 이 병을 팥의 세균성잎마름병으로 명명하였다.

벼 흰빛잎마름병 저항성유전에 관한 연구 (Inheritance of Resistance to Bacterial Leaf Blight Caused by Xanthomonas oryzae (Uyeda at Isheyama) Dowson in Rice)

  • 손재근;김문호
    • 한국응용곤충학회지
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    • 제19권3호
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    • pp.156-162
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    • 1980
  • 벼 흰빛잎마름병의 저항성의 품종간 차이와 그 유전양식을 조사하여 저항성품종육성의 기초자료로 활용코저 몇 가지 시험을 수행하여 얻어진 결과는 다음과 같다. 1. 최고분얼기와 출수기때의 저항성정도는 품종에 따라 상이한 반응을 보였고 공시품종중에서 IR2061-465-1-5-5, IR2061-553-6-9, IR1561-228-3-3, 밀양 42호는 공시된 3균주에 대해 최고분얼기나 출수기에 모두 높은 저항성을 보였다. 2. 질적저항성이 동일한 품종군에 속하는 품종중에서도 저항성정도의 양적인 차이는 크게 인정되었고, 그 차는 품종군별로는 밀양 23호군에서 균주별로는 II 균군에서 크게 나타났다. 3. IR2061-465-1-5-5와 IR1561-228-3-3의 II균군에 대한 저항성의 유전은 $F_1,F_2$$F_3$ 세대의 분리양상으로 보아 $1\~2$개의 유전인자에 의해 저항성이 지배된다고느 보기 어렵고 상당수의 유전인자가 이에 관여하는 것으로 생각된다.

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Screening Rice Cultivars for Resistance to Bacterial Leaf Blight

  • Fred, Agaba Kayihura;Kiswara, Gilang;Yi, Gihwan;Kim, Kyung-Min
    • Journal of Microbiology and Biotechnology
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    • 제26권5호
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    • pp.938-945
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    • 2016
  • Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most serious threats to rice production. In this study, screening of rice for resistance to BLB was carried out at two different times and locations; that is, in a greenhouse during winter and in an open field during summer. The pathogenicity of Xoo race K1 was tested on 32 Korean rice cultivars. Inoculation was conducted at the maximum tillering stage, and the lesion length was measured after 14 days of inoculation. Five cultivars, Hanareum, Namcheon, Samgdeok, Samgang, and Yangjo, were found to be resistant in both the greenhouse and open-field screenings. Expression of the plant defense-related genes JAmyb, OsNPR1, OsPR1a, OsWRKY45, and OsPR10b was observed in resistant and susceptible cultivars by qRT-PCR. Among the five genes tested, only OsPR10b showed coherent expression with the phenotypes. Screening of resistance to Xoo in rice was more accurate when conducted in open fields in the summer cultivation period than in greenhouses in winter. The expression of plant defense-related genes after bacterial inoculation could give another perspective in elucidating defense mechanisms by using both resistant and susceptible individuals.

Additive Main Effects and Multiplicative Interaction Analysis of Host-Pathogen Relationship in Rice-Bacterial Blight Pathosystem

  • Nayak, D.;Bose, L.K.;Singh, S.;Nayak, P.
    • The Plant Pathology Journal
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    • 제24권3호
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    • pp.337-351
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    • 2008
  • Host-pathogen interaction in rice bacterial blight pathosystem was analyzed for a better understanding of their relationship and recognition of stable pathogenicity among the populations of Xanthomonas oryzae pv. oryzae. A total number of 52 bacterial strains isolated from diseased leaf samples collected from 12 rice growing states and one Union Territory of India, were inoculated on 16 rice varieties, each possessing known genes for resistance. Analysis of variance revealed that the host genotypes(G) accounted for largest(78.4%) proportion of the total sum of squares(SS), followed by 16.5% due to the pathogen isolates(I) and 5.1% due to the $I{\times}G$ interactions. Application of the Additive Main effects and Multiplicative Interaction(AMMI) model revealed that the first two interaction principal component axes(IPCA) accounted for 66.8% and 21.5% of the interaction SS, respectively. The biplot generated using the isolate and genotypic scores of the first two IPCAs revealed groups of host genotypes and pathogen isolates falling into four sectors. A group of five isolates with high virulence, high absolute IPCA-1 scores, moderate IPCA-2 scores, low AMMI stability index '$D_i$' values and minimal deviations from additive main effects displayed in AMMI biplot as well as response plot, were identified as possessing stable pathogenicity across 16 host genotypes. The largest group of 27 isolates with low virulence, small IPCA-1 as well as IPCA-2 scores, low $D_i$ values and minimal deviations from additive main effect predictions, possessed stable pathogenicity for low virulence. The AMMI analysis and biplot display facilitated in a better understanding of the host-pathogen interaction, adaptability of pathogen isolates to specific host genotypes, identification of isolates showing stable pathogenicity and most discriminating host genotypes, which could be useful in location specific breeding programs aiming at deployment of resistant host genotypes in bacterial blight disease control strategies.

벼 생육시기별 흰잎마름병 발병이 쌀 수량감소 및 미질에 미치는 영향 (Effects of Bacterial Leaf Blight Occurrence on Rice Yield and Grain Quality in Different Rice Growth Stage)

  • 노태환;이두구;박종철;심형권;최만영;강미형;김재덕
    • 식물병연구
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    • 제13권1호
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    • pp.20-23
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    • 2007
  • 2002년부터 2005년까지 4년간 벼 흰잎마름병 초발병 조사결과 2002년보다 초발병일이 20$\sim$30일 이상 빨라지고 있음을 확인하였다. 벼 흰잎마름병 발병시기 및 병반면적율에 따라 수량이 감소하였는데 병반면적률이 10% 이하에서는 피해가 적었으나, 병반적율이 증가함에 따라서 수량감소가 점점 많아졌고, 25% 이상일 때부터 수량감소 및 현미천립중 등에서 현저히 낮아지고 병반면적율이 50% 이상이고 유수형성기 발병시 수량 29%, 현미천립중 2.3g, 현미완전립률 18%까지 감소되었다. 밥맛의 기준이 되는 식미치인 점도에서도 병반면적율이 증가함에 따라 낮은 식미치를 보였다.