• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 춘계학술대회
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• pp.71-71
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• 2020

Xanthoceras sorbifolia Bunge, the sole species in the genus Xanthoceras, is a flowering plant in the family Sapindaceae. It is an important tree species being a source of edible oil and biodiesel with a capacity as a pioneer of degraded and desert land. Seeds of X. sorbifolia were collected from two plantations and two superior trees in Inner Mongolia; and one plantation and one superior tree in Liaoning, China. An inter simple sequence repeat (ISSR) analysis showed genetic variation among four artificial populations in China: two in Inner Mongolia (IM), one in Liaoning (LN), and one in Shandong (SD). The average percentage of polymorphic loci was 81.25 % for these four populations. Based on an analysis of molecular variance, 23 % of the total genetic variation was found among populations, and 77 % within populations. Traits of seeds varied considerably between and among areas, for example two trees produced quite different seeds in several traits although they are adjacent to each other in the same farm. As much attention has not been paid to the traits of seeds, there should be a genetic test to understand this variation. It is necessary to obtain information on seed characteristics first and then provide basic information for further research on the selection of superior trees and provenances.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제1권1호
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• pp.58-67
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• 2020

Terrestrial ecosystems influence climate change via their climate regulation function, which is manifested within the carbon, water, and energy circulation between the atmosphere and surface. However, it has been challenging to quantify the climate regulation of terrestrial ecosystems and identify its regional distribution, which provides useful information for establishing regional climate-mitigation plans as well as facilitates better understanding of the interactions between the climate and land processes. In this study, a land surface model (LSM) that represents the land-atmosphere interactions and plant phenological variations was introduced to assess the contributions of terrestrial ecosystems to atmospheric warming or cooling effects over East Asia over the last half century. Three main climate-regulating components were simulated: net radiation flux, carbon exchange, and moisture flux at the surface. Then, the contribution of each component to the atmospheric warming or cooling (negative or positive feedback to the atmosphere, respectively) was investigated. The results showed that the terrestrial ecosystem over the Siberian region has shown a relatively large increase in positive feedback due to the enhancement of biogeochemical processes, indicating an offset effect to delay global warming. Meanwhile, the Gobi Desert shows different regional variations: increase in positive feedback in its southern part but increase in negative one in its eastern part, which implies the eastward movements of desert areas. As such, even though the LSM has limitations, this model approach to quantify the climate regulation is useful to extract the relevant characteristics in its spatio-temporal variations.

• Journal of Microbiology and Biotechnology
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• 제33권5호
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• pp.607-620
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• 2023

The biocontrol approach using beneficial microorganisms to control crop diseases is becoming an essential alternative to chemical fungicides. Therefore, new and efficient biocontrol agents (BCA) are needed. In this study, a rhizospheric actinomycete isolate showed unique and promising antagonistic activity against three of the most common phytopathogenic fungi, Fusarium oxysporum MH105, Rhizoctonia solani To18, and Alternaria brassicicola CBS107. Identification of the antagonistic strain, which was performed according to spore morphology and cell wall chemotype, suggested that it belongs to the Nocardiopsaceae. Furthermore, cultural, physiological, and biochemical characteristics, together with phylogenetic analysis of the 16S rRNA gene (OP869859.1), indicated the identity of this strain to Nocardiopsis alba. The cell-free filtrate (CFF) of the strain was evaluated for its antifungal potency, and the resultant inhibition zone diameters ranged from 17.0 ± 0.92 to 19.5 ± 0.28 mm for the tested fungal species. Additionally, the CFF was evaluated in vitro to control Fusarium wilt disease in Vicia faba using the spraying method under greenhouse conditions, and the results showed marked differences in virulence between the control and treatment plants, indicating the biocontrol efficacy of this actinomycete. A promising plant-growth promoting (PGP) ability in seed germination and seedling growth of V. faba was also recorded in vitro for the CFF, which displayed PGP traits of phosphate solubilization (48 mg/100 ml) as well as production of indole acetic acid (34 ㎍/ml) and ammonia (20 ㎍/ml). This study provided scientific validation that the new rhizobacterium Nocardiopsis alba strain BH35 could be further utilized in bioformulation and possesses biocontrol and plant growth-promoting capabilities.

• 한국태양에너지학회 논문집
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• 제35권2호
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• pp.63-71
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• 2015

Soiling is the accumulation of dirt on photovoltaic (PV) modules and can reduce the performance of the PV power plant depending on the site location. Nevertheless, the reason which can not be the great interest to researchers of PV reliability is the phenomenon of performance loss caused by external environmental factors, not the internal degradation of the PV module. In this paper, we provide the phenomenon, history, research overview and mitigation method in order to help understanding of the soiling.

• Mycobiology
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• 제47권3호
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• pp.261-272
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• 2019

Oomycetes are widely distributed in various environments, including desert and polar regions. Depending upon different habits and hosts, they have evolved with both saprophytic and pathogenic nutritional modes. Freshwater ecosystem is one of the most important habitats for members of oomycetes. Most studies on oomycete diversity, however, have been biased mostly towards terrestrial phytopathogenic species, rather than aquatic species, although their roles as saprophytes and parasites are essential for freshwater ecosystems. In this study, we isolated oomycete strains from soil sediment, algae, and decaying plant debris in freshwater streams of Korea. The strains were identified based on cultural and morphological characteristics, as well as molecular phylogenetic analyses of ITS rDNA, cox1, and cox2 mtDNA sequences. As a result, we discovered eight oomycete species previously unknown in Korea, namely Phytopythium chamaehyphon, Phytopythium litorale, Phytopythium vexans, Pythium diclinum, Pythium heterothallicum, Pythium inflatum, Pythium intermedium, and Pythium oopapillum. Diversity and ecology of freshwater oomycetes in Korea are poorly understood. This study could contribute to understand their distribution and ecological function in freshwater ecosystem.

• The Plant Pathology Journal
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• 제39권3호
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• pp.265-274
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• 2023

Citrus black rot is a serious disease of citrus plants caused by Alternaria citri. The current study aimed to synthesize zinc oxide nanoparticles (ZnO-NPs) by chemically or green method and investigate their antifungal activity against A. citri. The sizes of synthesized as measured by transmission electron microscope of ZnO-NPs were 88 and 65 nm for chemical and green methods, respectively. The studied prepared ZnO-NPs were applied, in vitro and in situ, at different concentrations (500, 1,000, and 2,000 ㎍/ml) in post-harvest treatment on navel orange fruits to verify the possible control effect against A. citri. Results of in vitro assay demonstrated that, at concentration 2,000 ㎍/ml, the green ZnO-NPs was able to inhibit about 61% of the fungal growth followed by 52% of chemical ZnO-NPs. In addition, scanning electron microscopy of A. citri treated in vitro with green ZnO-NPs showed swelling and deformation of conidia. Results showed also that, using a chemically and green ZnO-NPs at 2,000 ㎍/ml in situ in post-harvest treatment of orange, artificially-infected with A. citri, has reduced the disease severity to 6.92% and 9.23%, respectively, compared to 23.84% of positive control (non-treated fruits) after 20 days of storage. The out findings of this study may contribute to the development of a natural, effective, and eco-friendly strategy for eradicating harmful phytopathogenic fungi.

• 한국토양비료학회지
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• 제6권3호
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• pp.193-197
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• 1973

1. 두 다년생(多年生) 사막식물(沙膜植物) (Lycium andersonii, Atriplex confertifolia)이 Na($NO_3{^-}$, $Cl^-$, $H_2PO_4{^-}$)의 다른 기원으로 식물체내(植物體內) cation-anion 균형에 대(對)한 영향을 평가하기 위해 온실에서 토양재배(土壤裁培)를 하였다. 2. 각(各) anion은 다른 anion과 상호작용(交互作用)이 있을지라도 시비(施肥)에 따라 주(主)로 엽(葉)에 증가되였다. 3. 측정(測定)된 전(全) anion(N. P. Cl)은 각(各) 식물(植物) 부분(部分)에 증가되였다. 4. 동시에 전(全) cation도 증가현상을 보였다. 5. Cation-action의 비율은 $NaNO_3$의 경우 현저(顯著)히 감소(減少)되였다. cation-anion 비율(比率)은 보통 1을 넘고 있다. 6. 염내(鹽內) Cl 및 N의 최고(最高) 함량은 이들 성분(成分)이 부여(附加)될 때 Lycium andersonii에서 13.51% 및 6.37%로 각각(各各) 나타나고 있다. 7. Na 농도(濃度)는 Lycium andersonii 보다 Atriplex confertifolia 에서 더 높았다. 8. Na의 각 처리간에 유의차가 있을지라도 전(全) cation은 일정(一定)하게 유지(維持)되는 것으로 봐 처리구(處理區)에서 Na가 증가 됨으로서 다른 Cation들 사이에 약간의 보상작용(補償作用)이 나타났다. 9. Lycium andersonii는 Li의 축적자(蓄績者)로 나타나고 있다.

• 식물분류학회지
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• 제47권3호
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• pp.171-179
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• 2017

Ten species of vascular plants newly recorded in Uzbekistan are presented. The first record of Anthemis ruthenica from the northern side of the Alay range is confirmed, and the species was found for the second time in a neighborhood of Tashkent as an alien. Carduus arabicus as a native plant in Central Asia is recorded for the first time from Western Pamir-Alay. Chondrilla brevirostris, C. macrocarpa, and C. phaeocephala are from the desert and adyrs zones. Crinitaria tatarica and Crepis mira collected from Western Tien-Shan are presented, Olgaea baldschuanica first recorded on the Babatag range of mountains as a subendemic species and Erigeron andryaloides from the Hissar range are reported here as among the flora of Uzbekistan. The former Centaurea apiculata Ledeb. was accepted as a synonym of C. scabiosa L. subsp. apiculata. All records were collected in different habitats of Uzbekistan. Taxonomic remarks, pictures and distribution maps for these species are provided.

• 한국농림기상학회:학술대회논문집
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• 한국농림기상학회 2016년도 추계 학술발표논문집
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• pp.41-43
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• 2016

• 식물병연구
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• 제16권3호
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• pp.294-298
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• 2010

고구마 뿌리혹선충(Meloidogyne incognita)에 대한 저항 성품종을 스크리닝하고자 32개 완숙 토마토 품종, 11개 방울 토마토 품종 및 8개 대목 토마토 품종을 대상으로 포트 검정을 통해 조사하였다. 완숙 토마토 32 품종중에서 저항성인 품종은 홈런킹이었고, 중간 저항성 품종은 레전드썸머, 레전드, 선명, 핑크탑, Top3, 델리스, 타샤, 릴리앙스 등 8 품종이었다. 방울 토마토 11 품종중에서는 레드체리가 저항성 품종이었고, 텐텐, 디저트, 레드스타, 베리킹, 아리가또 등이 중간 저항성 품종이었다. 8개의 대목 토마토 품종중에서는 부킹하계, 스페셜이 저항성 품종이었고, B-블로킹, 솔류션, 동반자, 그린파워가 등이 중간 저항성 품종이었다.