• 한국식물병리학회지
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• 제14권6호
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• pp.682-688
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• 1998

Fungicide resistance of 48 isolates of Botrytis cinerea collected from citrus in Cheju was investigated and genetic diversity was analyzed with random amplified polymorphic DNA(RAPD). High levels of resistance to benzimidazole fungicides benomyl and thiophanate-methyl and N-phenylcarbamate fungicide diethofencarb were observed. Negative cross resistance was clear between benzimidazole and N-phenylcarbamate fungicides, and multiple resistance to the fungicides was also observed. There was cross resistance among the dicarboximide fungicides procymidione, vinclozolin and iprodione as it was observed between the benzimidazole fungicides benomyl and thiophanate-methyl. The lowest levels of resistance were to the dicarboximide fungicides, but no sensitive isolate to polyoxin B was observed. The isolates showed genetically diverse RAPD profiles according to the geographic origin collected, but there was no significant correaltion between RAPD profiles of genomic DNA and the levels of fungicide resistance of the isolates. The isolates showed genetically diverse RAPD profiles, indicating that genetic differentiation had already occurred in the populations of B. cinerea distributed in Cheju.

• 농업과학연구
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• 제19권2호
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• pp.170-178
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• 1992

1990년도 전국의 시설재배 딸기 포장에서 잿빛곰팡이병균(Botrytis cinerea)을 분리하여 dicarboximide약제 저항성정도를 조사하였다. 공시한 잿빛곰팡이병균 9개 균주를 공시하여 dicarboximide계 약제인 procymidone과 vinclozolin을 각각 100, 400, $1,600{\mu}g/ml$씩 함유하는 PDA배지에서 배양할 경우 균사생장을 보여주는 저항성 균주는 5개 균주였다. 약제저항성균주에 대한 dicarboximide계 약제의 균사생육가능최저농도(MIC)는 $6,400{\mu}g/ml$이상이었으며 감수성균의 MIC는 1.56 또는 $6.25{\mu}g/ml$이하였다. Dicarboximide계 약제를 함유하는 PDA배지에서 잿빛곰팡이병균의 분생포자를 발아시킬 경우 약제저항성균주는 90% 이상의 높은 발아율을 보여준 반면에 감수성균주는 전혀 발아하지 못하거나 5% 이하의 매우 낮은 발아율을 보여주었다. Procymidone 저항성균은 vinclozolin에 교차저항성을 나타내었으나 dichlofluanid 에는 교차저항성이 인정되지 않았다. Procymidone 및 vinclozolin에 저항성인 모든 균주와 감수성인 균주중 일부가 benomyl에도 저항성을 나타내었다. 전국의 시설재배 딸기 포장에서 분리한 B. cinerea 223개 균주중에서 dicarboximide계 약제저항성균주의 비율은 40%였고, 이들 저항성균은 전국적으로 고르게 분포하고 있었다.

• 한국식물병리학회지
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• 제14권4호
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• pp.367-370
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• 1998

Monilina fructicola, the brown rot fungus of stone fruits, was isolated from overwintering mummies and peduncles on peach trees from February to March, 1998. The resistant population of these isolates to benzimidazole (benomyl, carbendazim and thiophanate-methyl) and dicarboximide (iprodione, vinclozolin and procymidone) was examined. Among 417 isolates, the incidence of isolates resistant to benomyl, carbendazim, and thiophanate-methyl were 45 (10.8%), 47 (11.3%), and 46 (11.0%), respectively. Forty two (10.0%) isolates showed cross-resistance to benzimidazole fungicides. On the other hand, the resistant isolates against iprodione, vinclozolin and procymidone were 186 (44.6%), 1 (0.2%) and 150 (36.0%), respectively. Among the isolates, 116 (27.8%) showed cross-resistance to iprodione and procymidone. Moreover, 27 (6.5%) of 417 isolates showed double-resistance to both benzimidazole (benomyl) and dicarboximide (iprodione).

• 한국식물병리학회지
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• 제14권6호
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• pp.693-699
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• 1998

Three three hundred and ninety seven isolates of Botrytis cinerea were isolated from infected plants of strawberry, tomato and cucumber from several areas in Korea during 1994∼1996 and the resistance of these isolates against some fungicides were examined. The isolation frequency of phenotypes resistant to carbendazim, procymidone, and diethofencarb were found to be 69.9 43.7, and 31.8%, respectively. The isolates were divided into six phenotypic groups; SSR, SRR, RSS, RRS, RSR and RRR, representing sensitive (S) or resistant (R) to benzimidazole, dicarboximide, and N-phenylcarbamate fungicides in order. The percentage of six phenotypes were 28.2, 2.0, 27.2, 41.0, 0.9 and 0.8%, respectively. On the basis of the mycelial growth inhibition (%) B. cinerea isolates were divided into three classes (class 1; 0∼50%, class 2; 51-99%, class 3; 100% inhibition) on carbendazim and three classes (class 1; 0∼75%, class 2; 76∼99%, class 3; 100% inhibition) on procymidone and the mixture of carbendazim+diethofencarb, respectively. Changes in sensitivity levles to carbendazim and carbendazim+diethofencarb were affected by introduction and increasing ratio of the use of diethofencarb.

• 농약과학회지
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• 제3권3호
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• pp.37-44
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• 1999

In vivo와 in vitro 생물검정법에서의 활성관계를 조사하고 또한 보다 효율적인 in vitro 검정법을 개발하기 위하여 작용기구가 다른 두 계열 살균제 즉 sulphamide계 (dichlofluanid와 tolylfluanid)와 dicarboximide계 살균제 (iprodione, vinclozolin 및 procymidone)을 시험약제로 하여 본 실험을 수행하였다. Dichlofluanid, tolylfluanid, iprodione, vinclozolin procymidone의 토마토 유묘에서의 병 방제효과는 유사하였다. 그러나 이들 살균제에 대해 in vitro 생물검정법으로 항균활성을 비교한 결과, sulphamide계 살균제는 포자발아 억제실험에서 높은 활성을 나타낸 반면에, dicarboximide계 살균제는 균사생장 억제실험에서 항균활성이 더 우수하였다. 그러므로 in vivo 병 방제효과가 유사하더라도 작용기구가 다르면 in vitro 생물검정법에서의 항균활성은 다르게 나타남을 알 수 있었다. 또한 포자현탁액을 넣은 96-well microtiter plate에 약제를 처리하고 3시간 배양 후 배양액을 제거하고 다시 새 배지를 넣어 배양한 후 생장억제를 조사한 실험 (microtiter plate method I, MPM I)에서는 살균제들의 포자발아 억제실험과 유사한 경향의 활성을 보였다. 96-well microtiter plate에서 포자현탁액을 6시간 동안 배양하여 포자를 발아시킨 후에 약제를 처리한 실험(microtiter plate method II, MPM II)에서의 항균활성은 균사생장 억제효과와 일치하는 경향을 보였다. 따라서 기존의 in vitro 항균활성 실험보다 편리하고 효율적인 MPM I과 II 방법은 각각 포자발아와 균사생장 억제실험을 대신할 수 있으리라 생각되었다.

• The Plant Pathology Journal
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• 제17권4호
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• pp.205-209
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• 2001

Dicarboximide-resistant isolates of Monilinia fructicola grew readily on media amended with dicarbosimide fungicides, and showed cross-resistance to pentachlo-ronitrobenzene (PCNB). The fitness of resistant isolates was inferior to that of sensitive isolates. Mycelial growth on fungicide-free medium was not significantly different between the dicarboximide-resistant and sensitive isolates. The originally high $\textrm{EC}_{50}$ values of the resistant isolate decreased after storage for 16 weeks at $4^{\circ}$. After inoculation with the mixture of spore suspensions of resistant and sensitive isolates, the re-isolation rate of the resistant spores was significantly reduced regardless of the mixing ratio. From the results, it could be concluded that the competitive ability of the resistant isolates is inferior to the sensitive ones.

• The Plant Pathology Journal
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• 제19권1호
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• pp.46-50
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• 2003

To evaluate the sensitivity of Monilinia fructicola to dicarboximides used in controlling brown rot of peach, the fungus was isolated from commercial peach orchards in Chochiwon (CH), Chongdo (CD), Gyeongsan (GY), and Youngduk (YO) in Korea. The population shift of dicarboximide-resistant isolates of M. fructicola was investigated for 3 years starting 1998. The frequency of procymidone-resistant isolates (PRI) was higher in CD and GY than in CH and YO. The frequency of PRI was higher in the mid season (July-August) than in the rest of the year. Cross-resistance rate of PRI to iprodione was over 87.8% during the investigation, and double-resistance to both procymidone and carbendazim was less than 10%. However, the rate of cross-resistant isolates to vinclozolin was low. In the orchards in GY and CH without any fungicide spray, the PRI population was persistent and did not vary for 3 years. The results suggest that dicarboximide resistance of M. fructicola could be a problem in controlling brown rot and blossom blight on peach trees because it may take a long time to recover the population with sensitive isolates even in the absence of these fungicides.

• Journal of Microbiology and Biotechnology
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• 제18권1호
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• pp.15-22
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• 2008

Four series (S, M, R, and W) of Alternaria longipes isolates were obtained based on consecutive selection with Dimethachlon (Dim) and ultraviolet irradiation. These isolates were then characterized according to their tolerance to Dim, sensitivity to osmotic stress, and phenotypic properties. All the selected Dim-resistant isolates showed a higher osmosensitivity than the parental strains, and the last generation was more resistant than the first generation in the M, R, and W series. In addition, the changes in the Dim resistance and osmotic sensitivity were not found to be directly correlated, and no distinct morphologic characteristics were found among the resistant and sensitive isolates, with the exception of the resistant isolate K-11. Thus, to investigate the molecular basis of the fungicide resistance, a group III two-component histidine kinase (HK) gene, AlHK1, was cloned from nineteen A. longipes isolates. AlHK1p was found to be comprised of a six 92-amino-acid repeat domain (AARD), HK domain, and response regulator domain, similar to the Os-1p from Neurospora crassa. A comparison of the nucleotide sequences of the AlHK1 gene from the Dim-sensitive and -resistant isolates revealed that all the resistant isolates contained a single-point mutation in the AARD of AlHK1p, with the exception of isolate K-11, where the AlHK1p contained a deletion of 107 amino acids. Moreover, the AlHK1p mutations in the isolates of each respective series involved the same amino acid substitution at the same site, although the resistance levels differed significantly in each series. Therefore, these findings suggested that a mutation in the AARD of AlHK1p was not the sole factor responsible for A. longipes resistance to dicarboximide fungicides.

• Applied Biological Chemistry
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• 제49권4호
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• pp.259-265
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• 2006

Benomyl과 procymidone에 대한 잿빛곰팡이병원균(Botrytis cinerea) 저항성 균주와 감수성 균주에 대한 mepanipyrim의 효과를 실내에서 조사하고 딸기, 오이, 포도에 대한 포장에서의 잿빛곰팡이병의 방제 효과를 시험하였다. 잿빛곰팡이병원균(Botrytis cinerea)의 균사 생장과 포자 발아율의 비교를 기초로 하여 benomyl과 procymidone을 각각 $100{\mu}g\;a.i./ml$씩 첨가한 감자한천배지(potato dextrose agar, PDA)에서 benomyl과 procymidone 살균제에 저항성 또는 감수성인 균주를 선발하였다. 선발된저항성 균들의 포자발아는 mepanipyrim의 농도가 증가함에도 불구하고 현저히 억제되지는 않았다. 그러나 포자 발아와는 대조적으로 균사의 생장은 benzimidazole 또는 dicarboximide계의 기존 다른 약제와 유사하게 억제되었다. Benomyl과 procymidone에 저항성인 분리 균주를 오이 잎에 접종한 후 mepanipyrim $250{\mu}g\;a.i./ml$을 처리하였을 때 병원균의 침투력이 현저히 억제되었지만 benomyl과 procymidone을 처리하였을 때는 그렇지 못했다. Mepanipyrim $250{\mu}g\;a.i./ml$을 포장에서 딸기, 오이, 포도에 처리하였을 때 잿빛곰팡이병이 현저히 억제된 것으로 나타나(Duncan's multiple range test, p<0.05), mepanipyrim이 benzimidazole과 dicarboximide계 등의 다른 살균제에 저항성인 잿빛곰팡이병원균에 의한 병을 방제하는데 효과적으로 사용될 수 있음을 제시하여 주었다.

• 한국식물병리학회지
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• 제11권2호
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• pp.146-150
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• 1995

1994년, 1995년에 주요 채소 작물에서 분리한 잿빛곰팡이병균(Botrytis cinerea)의 방제 살균제에 대한 저항성을 조사한 결과, 1994년 분리된 713균주 중 610균주(85.6%)가 benzimidazole계에 저항성(Ben\ulcorner)이었고, 249균주(34.9%)는 dicarboximide계 살균제에 저항성(Pro\ulcorner)이었으며, benzimidazole계 및 N-phenyl carbamate계 두약제 모두에 저항성인 균주는 분리되지 않았다. 1995년에는 현재까지 520균주를 분리하였는데, 그중 Ben\ulcorner이 317균주(61%)이며 Pro\ulcorner은 214균주(41.2%)이었고, Ben\ulcorner이며 NPC\ulcorner인 균주(Ben\ulcorner+NPC\ulcorner)는 15균주(2.9%)로 나타났다. 이러한 저항성 균주의 최소 억제 농도는 carbendazim 1,000 $\mu\textrm{g}$/ml 이상, diethofencarb 1,000 $\mu\textrm{g}$/ml 이상이었다. 또 Ben\ulcorner+NPC\ulcorner인 15균주 중 3균주는 dicarboximide계 살균제인 procymidone에도 저항성이었으며, 한 균주를 제외한 모든 Pro\ulcorner 균주는 Ben\ulcorner로 나타났다.