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84 results on '"Park, Kyungseok"'

43. Induction of systemic resistance in Panax ginsengagainst Phytophthora cactorumby native Bacillus amyloliquefaciensHK34

Author

Lee, Byung Dae, Dutta, Swarnalee, Ryu, Hojin, Yoo, Sung-Je, Suh, Dong-Sang, and Park, Kyungseok

Abstract

Korean ginseng (Panax ginsengMeyer) is a perennial herb prone to various root diseases, with Phytophthora cactorumbeing considered one of the most dreaded pathogens. P. cactorumcauses foliar blight and root rot. Although chemical pesticides are available for disease control, attention has been shifted to viable, eco-friendly, and cost-effective biological means such as plant growth-promoting rhizobacteria (PGPR) for control of diseases.

Published
2015
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44. Induced suppression of soft rot disease in tobacco by combined application of Bacillus subtilis strain B4 and chemical elicitor BTH.

Author

Park, Kyungseok, Park, Jin-Woo, Lee, Se-Weon, and Balaraju, Kotnala

Subjects
*TOBACCO diseases & pests, *BUTT rots, *BACILLUS subtilis, *ELICITORS (Botany), *BENZOTHIAZOLE, *PLANT growth-promoting rhizobacteria, *ERWINIA
Abstract

In this study, the utility of the combined application of Benzo-(1,2,3)-thidiazole-7-carbothioic acid S-methyl ester (BTH), a systemic acquired resistance (SAR) inducer, and the plant growth-promoting rhizobacteria (PGPR),Bacillus subtilisstrain B4 (B4), was investigated for the suppression of soft rot disease caused by Pectobacterium carotovorum SCC1 (SCC1) in tobacco seedlings. Soft rot disease was completely suppressed in tobacco with combined application of B4 strain and 0.1 mM BTH when compared to individual application upon pathogen challenge. In addition, the population of bacterial cells of B4 strain was found to be greater when cultured in growth media in the presence of BTH, compared to the growth of B4 strain in the absence of BTH. Spectrophotometer analysis revealed that there was an increased broad range of compounds in the culture filtrate of B4 strain when grown with BTH, compared to the culture filtrate of B4 strain alone. The combined application of B4 strain and 0.1 mM BTH induced the increased expression of PR1a::GUS on tobacco and elicited systemic resistance against SCC1 when compared to individual application. However, there was low expression of PR1a::GUS in the water-treated control. Hence, the integrated use of BTH and B4 strain might be one of the strategies for biological control of soft rot disease through induced systemic resistance (ISR) in tobacco plants. [ABSTRACT FROM AUTHOR]

Published
2013
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45. Biological control of Colletotrichum panacicolaon Panax ginsengby Bacillus subtilisHK-CSM-1

Author

Ryu, Hojin, Park, Hoon, Suh, Dong-Sang, Jung, Gun Ho, Park, Kyungseok, and Lee, Byung Dae

Abstract

Biological control of plant pathogens using benign or beneficial microorganisms as antagonistic agents is currently considered to be an important component of integrated pest management in agricultural crops. In this study, we evaluated the potential of Bacillus subtilisstrain HK-CSM-1 as a biological control agent against Colletotrichum panacicola.

Published
2014
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46. Effect of Sclerotial Distribution Pattern of Sclerotinia sclerotiorumon Colonizing Ability of Trichoderma harzianum

Author

Bae, Yeoung-Seuk, Park, Kyungseok, and Knudsen, Guy R.

Abstract

Field studies were conducted over two seasons during the summers of 1997 and 1998 to investigate the effects of different spatial arrangements (random or highly aggregated) of sclerotia of Sclerotinia sclerotiorumand alginate pellet types (bran or polyethylene glycol) on colonization of sclerotia by Trichodermaspp. Treatment with alginate pellets increased the mean percentages of sclerotia colonized by Trichodermaspp. in both years. Distribution patterns of sclerotia affected the mean percentage of sclerotia colonized by Trichodermaspp. in both years, indicating that a highly aggregated distribution of sclerotia was more favorable to colonization by Trichodermaspp. The effects of the different pellet types (bran or PEG) were not significant in both years (P >0.05). The application of higher densities (200 pellets per 1 m2) of alginate pellets resulted in higher mean percentages of sclerotia colonized by Trichodermaspp. in 1998 (P <0.05), but did not in 1997.

Published
2001
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47. Systemic Resistance and Expression of the Pathogenesis-Related Genes Mediated by the Plant Growth-Promoting Rhizobacterium Bacillus amyloliquefaciensEXTN-1 Against Anthracnose Disease in Cucumber

Author

Park, Kyungseok, Ahn, II-Pyung, and Kim, Choong-Hoe

Abstract

Plants have the ability to acquire an enhanced level of resistance to pathogen attack after being exposed to specific biotic stimuli. To obtain plant growth-promoting rhizobacteria inducing resistance against cucumber anthracnose by Colletotrichum orbiculare,more than 800 strains of rhizobacteria were screened in the greenhouse. Among these strains, Bacillus amyloliquefacienssolate EXTN-1 showed significant disease control efficacy on the plants. Induction of pathogenesis-related (PR-1a)gene expression by EXTN-1 was assessed using tobacco plants transformed with PR-1a::β-glucuronidase (GUS)construct. GUS activities of tobacco treated with EXTN-1 and salicylic acid-treated transgenic tobacco were significantly higher than those of tobacco plants with other treatments. Gene expression analyses indicated that EXTN-1 induces the accumulation of defense-related genes of tobacco. The results showed that some defense genes are expressed by the treatment with EXTN-1 suggesting the similar resistance mechanism by salicylic acid.

Published
2001
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48. Different Mechanisms of Induced Systemic Resistance and Systemic Acquired Resistance Against Colletotrichum orbiculareon the Leaves of Cucumber Plants

Author

Jeun, Yong-Chull, Park, Kyungseok, and Kim, Choong-Hoe

Abstract

Defense mechanisms against anthracnose disease caused by Colletotrichum orbiculareon the leaf surface of cucumber plants after pre-treatment with plant growth promoting rhizobacteria (PGPR), amino salicylic acid (ASA) or C. orbicularewere compared using a fluorescence microscope. Induced systemic resistance was mediated by the pre-inoculation in the root system with PGPR strain Bacillus amywlquefaciensEXTN-1 that showed direct antifungal activity to C. gweosporioidesand C. orbiculare.Also, systemic acquired resistance was triggered by the pre-treatments on the bottom leaves with amino salicylic acid or conidial suspension of C. orbiculare.The protection values on the leaves expressing SAR were higher compared to those expressing ISR. After pre-inoculation with PGPR strains no change of the plants was found in phenotype, while necrosis or hypersensitive reaction (HR) was observed on the leaves of plants pre-treated with ASA or the pathogen. After challenge inoculation, inhibition of fungal growth was observed on the leaves expressing both ISR and SAR. HR was frequently observed at the penetration sites of both resistance-expressing leaves. Appressorium formation was dramatically reduced on the leaves of plants pre-treated with ASA, whereas EXTN-1 did not suppress the appressorium formation. ASA also more strongly inhibited the conidial germination than EXTN-1. Conversely, EXTN-1 significantly increased the frequency of callose formation at the penetration sites, but ASA did not. The defense mechanisms induced by C. orbicularewere similar to those by ASA. Based on these results it is suggested that resistance mechanisms on the leaf surface was different between on the cucumber leaves expressing ISR and SAR, resulting in the different protection values.

Published
2001
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50. Occurrence of Anthracnose on Cabbage Caused by Colletotrichum dematium

Author

Park, Kyungseok and Kim, Choong-Hoe

Abstract

Anthracnose symptoms on young cabbages were found in cabbage nursery fields in Jangheung area of Korea in 1998. The symptoms developed on seedlings, leaves, and stems of young cabbages (Brassica oleraceavar. capitataL.). The casual fungus was identified as Colletotrichum dematium(Fr.) Grove based on morphological and cultural characteristics. Similar symptoms were observed on the cabbage when artificially inoculated on the plant leaves. The fungus was reisolated from the symptoms of the inoculated plant.

Published
2001
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