• 제목/요약/키워드: root-rot

검색결과 433건 처리시간 0.021초

Cylindrocarpon destructans/Ilyonectria radicicola-species complex: Causative agent of ginseng root-rot disease and rusty symptoms

  • Farh, Mohamed El-Agamy;Kim, Yeon-Ju;Kim, Yu-Jin;Yang, Deok-Chun
    • Journal of Ginseng Research
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    • 제42권1호
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    • pp.9-15
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    • 2018
  • Cylindrocarpon destructans/Ilyonectria radicicola is thought to cause both rusty symptom and root-rot disease of American and Korean ginseng. Root-rot disease poses a more serious threat to ginseng roots than rusty symptoms, which we argue result from the plant defense response to pathogen attack. Therefore, strains causing rotten root are characterized as more aggressive than strains causing rusty symptoms. In this review, we state 1- the molecular evidence indicating that the root-rot causing strains are genetically distinct considering them as a separate species of Ilyonectria, namely I. mors-panacis and 2- the physiological and biochemical differences between the weakly and highly aggressive species as well as those between rusty and rotten ginseng plants. Eventually, we postulated that rusty symptom occurs on ginseng roots due to incompatible interactions with the weakly aggressive species of Ilyonectria, by the established iron-phenolic compound complexes while root-rot is developed by I. morspanacis infection due to the production of high quantities of hydrolytic and oxidative fungal enzymes which destroy the plant defensive barriers, in parallel with the pathogen growth stimulation by utilizing the available iron. Furthermore, we highlight future areas for study that will help elucidate the complete mechanism of root-rot disease development.

콩 흑색(黑色) 뿌리 썩음병(病)의 이병(罹病) 정도(程度)에 따른 수량(收量) 감소(減少) (Yield Loss Associated with Disease Severity of Soybean Black Root Rot by Cylindrocladium crotalariae)

  • 성재모;정길웅
    • 한국균학회지
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    • 제11권2호
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    • pp.99-101
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    • 1983
  • Black root rot caused by Cylindrocladium crotalariae is one of the most serious soilborne disease in soybean. Plant height reduction of Hwangkeum Kong was 38% by the rotting of the whole main root and 9% by rotting of the half of the main root as compared with partial discoloration in the main root. Pod number per plant and seed weight were significantly reduced by the increase of the disease severity. Important yield components such as number of pods per plant and seed weight were negatively correlated with the soybean black root rot severity.

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콩의 미기녹(未記錄) 병(病)인 Cylindrocladium(Calonectria) crotalaria에 의한 흑색(黑色) 뿌리썩음병 (An Investigation of Undescribed Black Root Rot Disease of Soybean Caused by Cylindrocladium(Calonectria) crotalariae in Korea)

  • 성재모
    • 한국균학회지
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    • 제8권1호
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    • pp.53-57
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    • 1980
  • An undescribed black root rot of soybean, caused by Cylindrocladium crotalariae, was observed in Suweon area. The diseased plants showed yellowing at the top and dry rot at the root. Lesions of roots and stems in the soil were red to brown and main roots were cracked. Although not observed the disease in the field, leaves of inoculated test plants in the greenhouse exhibited circular, brown lesion surrounded by chloratic halos. The fungus was recovered in culture from the infected stem and root, and the perithecia of Calonectria crotalariae were demonstrated to be present as well as the cylindrocladium state. The fungus was pathogenic to the root, stem, petioles and leaves of soybean. The probable source of primary inoculum was microsclerotia formed in infected soybean root and stem from the previous season's soybean debris. Black root rot by this fungus was considered to be one of detrimental factors to the maximum yield of soybean. From the morphological and physiological characteristics and pathogenic behaviors, this fungus was identified as Cylindrocladium(Calonectria) crotalariae.

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Neopestalotiopsis clavispora에 의한 딸기 뿌리썩음병 한국 내 발생 (Crown and Root Rot of Strawberry Caused by Neopestalotiopsis clavispora in Korea)

  • 박경미;한인영;이석민;최시림;김민철;이흥수
    • 한국균학회지
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    • 제47권4호
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    • pp.427-435
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    • 2019
  • 최근 경남 산청, 함양의 딸기 재배지역의 육묘하우스에서 딸기 묘목의 뿌리와 관부를 썩게 하고 지상부의 생육을 저해하며 최종적으로 식물체를 시들게 하는 뿌리썩음병(가칭)증상이 발생하였다. 이러한 병반을 나타내는 딸기 식물체 뿌리와 관부로부터 병원균을 분리하고 균학적 특성을 조사하였으며, 유전자 염기서열 분석과 계통학적 분석을 수행하였다. 그 결과, 딸기 육묘과정에서 발생한 뿌리썩음병(가칭)의 병원균은 Neopestalotiopsis clavispora로 확인되었으며, 건전한 딸기 식물체를 대상으로 접종실험을 수행한 결과 딸기에 대한 병원성을 확인하였다. 지금까지 국내에서 N. clavispora에 의한 딸기 뿌리썩음병이 보고되지 않았으므로 본 연구결과를 바탕으로 이병을 딸기뿌리썩음병으로 국내 최초로 보고한다.

Bacillus subtilis B-4228의 인삼 근부병 억제효과 (Control Effect of Bacillus subtilis B-4228 on Root Rot of Panax ginseng)

  • 이병대;밝훈
    • Journal of Ginseng Research
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    • 제28권1호
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    • pp.67-70
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    • 2004
  • 인삼 근부병의 생물학적 방제를 위해 인삼 재배토양으로부터 분리된 길항미생물 Bacillu subtilis B-4228을 사용하여 방제효과를 검정하였다. 공시 균주 B-4228과 C. destructans의 대치배양결과, C destructans의 균사가 비정상적인 형태로 팽창하였으며 강한 생장억제력을 보였다. C. destructans에 의해 오염된 이병토를 이용한 pot시험결과, 건전근율이 무처리구에서 20%였으나 공시 균주 B-4228의 처리구는 82%로 높게 나타났고, 이병율(개체 인삼에 대한 뿌리썩음 이병정도의 총합비율)은 무처리의 경우 50.4%였으나 공시 균주 B-4228의 처리구는 6.0%로 낮았다.

Phytophthora drechsleri에 의한 곰취 역병 (Phytophthora Root Rot of Ligularia fishcheri Caused by P. drechsleri)

  • 권순배;지형진;방순배;이경국;홍정기
    • 식물병과 농업
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    • 제5권1호
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    • pp.58-60
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    • 1999
  • Cultivation of a native wild vegetable, Ligularia fischeri, is hampered by Phytophthora sp. Infected plants showed wilt and eventual death due to rots on the root and basal portion. Eight isolates collected were all identified as P. drechsleri based on their mycological characteristics. The fungi showed relatively strong pathogenicity to L. Fischeri, mild to Aster scaber and Codonoposis lanceolata, and none to Circium setidens and Pimpinella brachycarpa. This is the first report of Phytophthora root rot on wild vegetables in Korea.

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Pythium spinosum Sawada에 의한 꽃도라지 뿌리썩음병의 발생 (Occurrence of Lisianthus (Eustoma gradiflorum) Root Rot Disease Caused by Pythium spinosum Sawada)

  • 김진원;김성기;박은우;홍순성;양장석
    • 한국식물병리학회지
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    • 제14권2호
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    • pp.103-108
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    • 1998
  • A Pythium species was isolated from roots of lisianthus (Eustoma grandiflorum) showing wilt symptoms and reduced growth in a greenhouse at Ichon, Kyonggi-do in 1997. The Pythium species was identified as Pythium spinosum Sawada based on various mycological characteristics. The isolate was strongly pathogenic when inoculated to root of lisianthus plants in pots. The diseased plants showed typical symptoms of root and crown rot, resulting in reduced growth of roots and shoots, and consequently wilting of the above ground part of plants.

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인삼 연작장해 유발토양과 억제토양의 화학성, 미생물상 및 뿌리썩음병 발생 특성 (Soil Chemical Properties, Microbial Community and Ginseng Root Rot in Suppressive and Conducive Soil Related Injury to Continuously Cropped Ginseng)

  • 이성우;이승호;서문원;장인복;권나영;허혜지
    • 한국약용작물학회지
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    • 제28권2호
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    • pp.142-151
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    • 2020
  • Background: Suppressive soil inhibits soil-borne diseases if pathogens are present, and ginseng does not show injury even if replanted in the same field. Methods and Results: Soil chemical properties and microbial community of soil were investigated in soil suppressive and conducive to ginseng root rot. Root rot disease in 2-year-old ginseng was tested by mixing conducive soil, with suppressive or sterilized suppressive soil. The root rot ratio in suppressive soil was 43.3% compared to 96.7% in conducive soil. Biological factors acted to inhibit the root rot because disease ratio was increased in the sterilized suppressive soil compared to that in non-suppressive soil. The suppressive soil had lower pH, nitrate nitrogen and sodium than the conducive soil. Dominat bacteria and fungi (more than 1.0%) were 3 and 17 species in conducive soil and 7 and 23 species in suppressive soil, respectively. The most predominant fungi were Pseudaleuria sp. HG936843 (28.70%) in conducive soil and Pseudogymnoascus roseus (7.52%) in suppressive soil. Conclusion: Microbial diversity was more abundant in the suppressive soil than in the conducive soil, and the proportion of pathogens (Nectriaceae sp.) causing root rot was significantly lower in the suppressive soil than in the conducive soil.

인삼 연작지에서 윤작물 작부체계가 토양화학성 및 인삼뿌리썩음병 발생에 미치는 영향 (Effect of Crop Rotation System on Soil Chemical Properties and Ginseng Root Rot after Harvesting Ginseng)

  • 이성우;이승호;박경훈;장인복;;서문원
    • 한국약용작물학회지
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    • 제25권4호
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    • pp.244-251
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    • 2017
  • Background: The application of crop rotation systems may reduce the occurrence of soil-borne diseases by releasing allelochemicals and by subsequent microbial decomposition. Methods and Results: For reduction of ginseng root rot by the crop rotation system, after harvesting 6-year-old ginseng, fresh ginseng was grown along with continuous cultivation of sweet potato, peanut, and bellflower. Growth of 2-year-old ginseng was significantly inhibited in the continuous cultivation than in the first cultivation. Sweet potato, peanut and bellflower cultivations assisted in obtaining normal yields of ginseng in the first year after the harvest of 6-year-old ginseng. Salt concentration, potassium and sodium contents were gradually decreased, and, organic matter was gradually increased through cirp rotation. Phosphate, calcium and magnesium contents were not altered. The density of the root rot fungus was gradually decreased by the increase in crop rotation; however it was decreased distinctly in the first year compared to the second and third year. The severity of root rot disease tended to decrease gradually by the increase of crop rotation. Conclusions: Short-term crop rotation for three years promoted the growth of ginseng, however root rot infection was not inhibited significantly, although it was somewhat effective in lowering the density of the root rot pathogen.

Aphelenchus avenae에 의한 인산 토양병의 억제효과 (Effects of Aphelenchus avenae on Suppression of Soilborne Diseases of Ginseng)

  • 김영호
    • 한국식물병리학회지
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    • 제10권4호
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    • pp.319-324
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    • 1994
  • The monoxenic culture of the fungivorous nematode, Aphelenchus avenae, was applied for the control of soil-borne ginseng pathogens such as Fusarium solani and Rhizoctonia solani. Fungivorous nematode populations were measured in a field to examine relationships between the nematode populations and suppression of ginseng root diseases. Inoculation of A. avenae (5000 nematodes per petri-dish) reduced the colonization of the Fusarium mycelium on root discs of ginseng and carrot by 80.0% and 60.5%, respectively. A. avenae also significantly reduced the occurrence of damping-off of ginseng by R. solani pathogenic to ginseng, and no plant damage by the nematode was noted. In a 3-year-old ginseng field infested with Cylindrocarpon destructans, plant missing caused by root rot positively correlated to the density of potato rot nematode, Ditylenchus destructor, but it was reduced with the population of A. avenae, suggesting that A. avenae might inhibit the occurrence of ginseng root rot.

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