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- 검색키워드
- 저자 : Elena Volynchikova (검색결과 4 건)
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Elena Volynchikova,김기덕 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.1
Previously, Pseudomonas plecoglossicida YJR13 and Pseudomonas putida YJR92 from a sequential screening procedure were proven to effectively control Phytophthora blight caused by Phytophthora capsici. In this study, we further investigated the anti-oomycete activities of these strains against mycelial growth, zoospore germination, and germ tube elongation of P. capsici. We also investigated root colonization ability of the bacterial strains in square dishes, including cell motility (swimming and swarming motilities) and biofilm formation. Both strains significantly inhibited mycelial growth in liquid and solid V8 juice media and M9 minimal media, zoospore germination, and germ tube elongation compared with Bacillus vallismortis EXTN-1 (positive biocontrol strain), Sphingomonas aquatilis KU408 (negative biocontrol strain), and MgSO4 solution (untreated control). In diluted (nutrient-deficient) V8 juice broth, the tested strain populations were maintained at >108 cells/ ml, simultaneously providing mycelial inhibitory activity. Additionally, these strains colonized pepper roots at a 106 cells/ml concentration for 7 days. The root colonization of the strains was supported by strong swimming and swarming activities, biofilm formation, and chemotactic activity towards exudate components (amino acids, organic acids, and sugars) of pepper roots. Collectively, these results suggest that strains YJR13 and YJR92 can effectively suppress Phytophthora blight of pepper through direct anti-oomycete activities against mycelial growth, zoospore germination and germ tube elongation. Bacterial colonization of pepper roots may be mediated by cell motility and biofilm formation together with chemotaxis to root exudates.
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Elena Volynchikova,Ki Deok Kim 한국균학회 2022 Mycobiology Vol.50 No.5
Oomycete pathogens that belong to the genus Phytophthora cause devastating diseases in solanaceous crops such as pepper, potato, and tobacco, resulting in crop production losses worldwide. Although the application of fungicides efficiently controls these diseases, it has been shown to trigger negative side effects such as environmental pollution, phytotoxicity, and fungicide resistance in plant pathogens. Therefore, biological control of Phytophthora- induced diseases was proposed as an environmentally sound alternative to conventional chemical control. In this review, progress on biological control of the soilborne oomycete plant pathogens, Phytophthora capsici, Phytophthora infestans, and Phytophthora nicotianae, infecting pepper, potato, and tobacco is described. Bacterial (e.g., Acinetobacter, Bacillus, Chryseobacterium, Paenibacillus, Pseudomonas, and Streptomyces) and fungal (e.g., Trichoderma and arbuscular mycorrhizal fungi) agents, and yeasts (e.g., Aureobasidium, Curvibasidium,andMetschnikowia) have been reported as successful biocontrol agents of Phytophthora pathogens. These microorganisms antagonize Phytophthora spp. via antimicro- bial compounds with inhibitory activities against mycelial growth, sporulation, and zoospore germination. They also trigger plant immunity-inducing systemic resistance via several path- ways, resulting in enhanced defense responses in their hosts. Along with plant protection, some of the microorganisms promote plant growth, thereby enhancing their beneficial rela- tions with host plants. Although the beneficial effects of the biocontrol microorganisms are acceptable, single applications of antagonistic microorganisms tend to lack consistent effi- cacy compared with chemical analogues. Therefore, strategies to improve the biocontrol per- formance of these prominent antagonists are also discussed in this review.
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Oh Ji Yeon,Sajidah Siti,Volynchikova Elena,Kim Yu Jin,Han Gyung Deok,Sang Mee Kyung,Kim Ki Deok 한국균학회 2022 Mycobiology Vol.50 No.6
The antifungal activity of thymol against Aspergillus awamori F23 and Botrytis aclada F15 in onions was examined through direct treatment with amended media and gaseous treatment with I-plates (plastic plates containing central partitions). The protective and curative control efficacy of thymol was examined 24 h before and after the inoculation of onion bulbs with the fungal isolates. Mycelial growth, sporulation, and spore germination of the isolates were inhibited on potato dextrose agar amended with various concentrations of thymol or acetic acid (positive control). Overall, thymol produced a stronger inhibitory effect on the mycelial growth and development of the isolates than acetic acid. Following gaseous treatment in I- plates, mycelial growth, sporulation, and spore germination of the isolates were inhibited at higher concentrations of thymol or acetic acid; however, acetic acid showed a little effect on the sporulation and spore germination of the isolates. Following the treatment of onion bulbs with 1000 mg L1 of thymol 24 h before and after fungal inoculation, lesion diameter was greatly reduced compared with that following treatment with 0.5% ethanol (solvent control). Onion bulbs sprayed with thymol 24 h before fungal inoculation generally showed reduced lesion diameters by isolate F23 but not in isolate F15 compared with those sprayed 24 h after fungal inoculation. Collectively, thymol effectively inhibited the growth and devel- opment of A. awamori and B. aclada on amended media and in I-plates. In addition, spray- ing or fumigation of thymol is more desirable for effectively controlling these postharvest fungal pathogens during long-term storage conditions.
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Isolation and Identification of a Bacterial Agent Causing Soft Rot in Chinese Cabbage
이영은(Young-Eun Lee),정진주(Jin-Ju Jeong),엘레나 볼린치코바(Elena Volynchikova),김기덕(Ki Deok Kim) 고려대학교 생명자원연구소 2019 생명자원연구 Vol.27 No.-
The Chinese cabbage (Brassica rapa subsp. pekinensis), part of the Brassicaceae family, is a biennial plant that has long been cultivated in China and East Asia. However, various plant diseases cause considerable damage to Chinese cabbage yields during cultivation. In this study, diseased Chinese cabbages that showed typical symptoms of bacterial soft rot were collected from different fields in Poheon, Gyeonggi-do, South Korea from September to October in 2019. The causal agent was isolated from the cabbage samples and subsequently re-inoculated into healthy cabbage tissues. The re-inoculated healthy cabbages showed the same symptoms as the diseased cabbages, from which the pathogen was originally isolated. The isolated pathogen was identified as a member of the genus Pseudomonas using 16S rRNA analysis. This result may suggest that a Pseudomonas species isolated from the cabbage can be the causal agent of soft rot that are currently spread in Pocheon, Korea. Further research for accurate identification of the bacterial species should be needed.
ScienceON
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