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Characterizing Bacterial Communities of Paddy Soils in Korea
Hang-Yeon Weon(원항연),Jae-Ho Joa(좌재호),Won-Il Choi(최원일),Byung-Koo Ahn(안병구),Young-Han Lee(이영한),An-Sung Roh(노안성),Hee-Kwon Kim(김희권),Seung-Chul Choi(최승출),Moon-Tae Choi(최문태),Jun-Hong Park(박준홍),Jae-Hyung Ahn(안 한국토양비료학회 2012 한국토양비료학회 학술발표회 초록집 Vol.2012 No.6
토마토에 염류 내성을 유도하는 바실러스 균주 처리 후 근권 미생물 군집 구조 연구
유성제,이신애,원항연,송재경,상미경,Yoo, Sung-Je,Lee, Shin Ae,Weon, Hang-Yeon,Song, Jaekyeong,Sang, Mee Kyung 한국환경농학회 2021 한국환경농학회지 Vol.40 No.1
BACKGROUND: Soil salinity causes reduction of crop productivity. Rhizosphere microbes have metabolic capabilities and ability to adaptation of plants to biotic and abiotic stresses. Plant growth-promoting bacteria (PGPB) could play a role as elicitors for inducing tolerance to stresses in plants by affecting resident microorganism in soil. This study was conducted to demonstrate the effect of selected strains on rhizosphere microbial community under salinity stress. METHODS AND RESULTS: The experiments were conducted in tomato plants in pots containing field soil. Bacterial suspension was inoculated into three-week-old tomato plants, one week after inoculation, and -1,000 kPa-balanced salinity stress was imposed. The physiological and biochemical attributes of plant under salt stress were monitored by evaluating pigment, malondialdehyde (MDA), proline, soil pH, electrical conductivity (EC) and ion concentrations. To demonstrate the effect of selected Bacillus strains on rhizosphere microbial community, soil microbial diversity and abundance were evaluated with Illumina MiSeq sequencing, and primer sets of 341F/805R and ITS3/ITS4 were used for bacterial and fungal communities, respectively. As a result, when the bacterial strains were inoculated and then salinity stress was imposed, the inoculation decreases the stress susceptibility including reduction in lipid peroxidation, enhanced pigmentation and proline accumulation which subsequently resulted in better plant growth. However, bacterial inoculations did not affect diversity (observed OTUs, ACE, Chao1 and Shannon) and structure (principle coordinate analysis) of microbial communities under salinity stress. Furthermore, relative abundance in microbial communities had no significant difference between bacterial treated- and untreated-soils under salinity stress. CONCLUSION: Inoculation of Bacillus strains could affect plant responses and soil pH of tomato plants under salinity stress, whereas microbial diversity and abundance had no significant difference by the bacterial treatments. These findings demonstrated that Bacillus strains could alleviate plant's salinity damages by regulating pigments, proline, and MDA contents without significant changes of microbial community in tomato plants, and can be used as effective biostimulators against salinity stress for sustainable agriculture.
미생물제(Sphingobium sp. Cam5-1) 처리에 따른 토양 중 카두사포스의 분해효과
연제형 ( Jehyeong Yeon ),정준휘 ( Joon-hui Chung ),최한석 ( Han Suk Choi ),고영준 ( Young-joon Ko ),김다연 ( Dayeon Kim ),안시현 ( Sihyun An ),안재형 ( Jae-hyung Ahn ),한귀환 ( Gui Hwan Han ),원항연 ( Hang-yeon Weon ) 한국환경농학회 2023 한국환경농학회지 Vol.42 No.4
Cadusafos, an organophosphorus insecticide, has been commonly used against various pests worldwide. Organophosphorus pesticides have shorter half-lives and lower toxicities than organochlorine pesticides. However, excessive use of Cadusafos can increase pest resistance and issues with acetylcholine biomagnification, potentially resulting in human toxicity. In this study, we investigated the effect of a Cadusafos-degrading microbial agent (CDMA) prepared using Sphingobium sp. Cam5-1, which was previously reported to effectively degrade residual Cadusafos in soil. Experiments were conducted under both controlled laboratory and greenhouse field conditions. Under laboratory conditions, CDMA (10<sup>6</sup> cfu/g soil application rate) decomposed 97% of Cadusafos in the soil in the untreated control after 21 days. Additionally, when CDMA (10<sup>6</sup> cfu/g soil) was mixed with quicklime, 99% of Cadusafos was decomposed within 3 days. Under greenhouse field conditions, the combined effect of CDMA (10<sup>6</sup> cfu/g soil) and quicklime was not observed. However, CDMA (10<sup>6</sup> cfu/g soil) application alone was capable of decompos- ing 91% of Cadusafos after 3 days. These results indicate that CDMA can effectively decompose high residual levels of Cadusafos in soils under field conditions using a low inoculum rate.
김수연 ( Su Yeon Kim ),김정봉 ( Jung Bong Kim ),김헌웅 ( Heon Woong Kim ),김세나 ( Se Na Kim ),김소영 ( So Young Kim ),조영숙 ( Young Sook Cho ),김재현 ( Jae Hyun Kim ),원항연 ( Hang Yun Weon ),함경식 ( Kyung Sik Ham ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.4
BACKGROUND: Inorganic component is made up largely of salt, because the criteria are difficult to split into domestic and imported ingredients, organic examined the fatty acid composition is to see a possible use as a marker using gas chromatography-mass spectrometry (GC-MS). The 14 domestic samples and 8 imported samples were collected from China, India and other countries were investigated on item of 37 fatty acids. METHODS AND RESULTS: The major components were six species, myristic acid (C14: 0), palmitic acid (C16: 0), palmitoleic acid (C16: 1), stearic acid (C18: 0), oleic acid (C18: 2, n9), linoleic acid (C18: 2, n6) among detected twenty fatty acids including 9 unknowns. The content of palmitic acid were highest as 25.2 to 50.8% of total fatty acids contents. Domestic has seen the most amount of salt in the Taepyeong salts 250.8㎍/100g, imports 135.2㎍/100g salt in Chinese Weifang salts showed the lowest content. CONCLUSION(s): The total fatty acid content has seen the most amount of salt in 352.3 ug/100g Christmas island salts showed the lowest content of 164.0㎍/100g, as a result it is difficult to distinguish the domestic salts and imported by the composition of fatty acid.