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A Seedbrone Fungus Bipolaris spicifera Deteced from Imported Grass Seeds
구한모,정일민,Sang-HunLee,Se-ChulChun 한국식물병리학회 2003 Plant Pathology Journal Vol.19 No.3
Seedborne fungus Bipolaris spicifera, which has not been previously reported in Korea, was detected from imported grass seeds in the country. The most frequently detected fungi from the seeds were Fusarium species, Ulocladium atrum, B. spicifera, Alternaria, and Cuvularia lunata among 17 different seed samples of the family Gramineae. Detection frequencies of B. spicifera were 11, 8, 5% in Bermuda grass, tall fescue, and mixed lawn grass imported from USA, respectively, and 9% in mixed lawn grass imported from Italy. This suggests that important seedborne pathogen could be spread between countries through seed sources. The pathogen was seed-transmitted causing damping-off of Bermuda grass seedlings and showed strong pathogenicity to rice, corn, Bermuda grass, sorghum, and tall fescue. However, it did not infect wheat and blue grass.
Eui-JooKim ( 김의주 ),Mi-HeeKim ( 김미희 ),Sang-HunLee ( 이상훈 ),Young-HanYou ( 유영한 ) 한국환경생태학회 2017 한국환경생태학회 학술대회지 Vol.2017 No.2
The aim of this research is to study the impact of invasive species Ambrosia trifida on the vitality of Polygonatum stenophyllum which is endangered species. We removed the cover degree of the invasive species at different levels(C, T1, T2) in the natural habitat where both invasive plant and endangered species and observed ecological responses of P. stenophyllum for two years. C(control) which removed none of A. trifida, T1(treatment 1) removed 40~60% coverage of A. trifida and T2(treatment 2) removed all A. trifida. Plant species number, shoot length, aboveground biomass weight, shoot weight, leaf weight, fruit weight, fruit number, seed weight, fruit number, seed number per fruit were higher in the treatments of removed invasive plant cover(T1, T2) than control(C) that didn't remove it both the first year and the second year(p<0.05). However, death rate and seed weight between the control(C) and treatment(T1, T2) were almost same in the first year but showed difference in second year. This result reveals that the A. trifida has significant impact on the performance reduction of Polygonatum stenophyllum. In conclusion, removal of more than 40% of invasive plant cover degree is required to conserve the endangered species.
Jae-KeunLee ( 이재근 ),Young-HoJung ( 정영호 ),Seung-YunLee ( 이승연 ),Kyu-TaeCho ( 조규태 ),Sang-HunLee ( 이상훈 ),Young-HanYou ( 유영한 ) 한국환경생태학회 2017 한국환경생태학회 학술대회지 Vol.2017 No.2
This study investigated growth response of Korean exotic woody plants Acer saccharinum L. and Amorpha fruticosa L., on the climate change. We also examined the growth on nitrogen treatment of them. Acer saccharinum L. and Amorpha fruticosa L. were sown in March 2014 and then transplanted to each environment conditions in May 2015. Atmospheric conditions were divided into the outdoor environment treatment(AC-AT), the temperature elevation treatment(AC-ET), and the climate change treatment (EC-ET). In each atmospheric condition, non-treated (Control; C) pots were placed without nitrogen fertilizer treatment. Acer saccharinum L. treated 2g (N1), 20g (N2) of nitrogen fertilizer, respectively. And Amorpha fruticosa L. treated 1g (N1), 5g (N2) of nitrogen fertilizer, respectively. After the adaptation to each environmental condition until October 2016, the length, diameter of stem-root border, aboveground biomass, underground biomass, and leaves weight of Acer saccharinum L. and Amorpha fruticosa L. were measured. The above results show that Acer saccharinum L. was affected the length of shoot under conditions of increased temperature. Amorpha fruticosaL. means that When the nitrogen increases under the condition that the temperature and the CO<sub>2</sub> concentration are increased together, the length of shoot and the Diameter of stem-root increase, but the Underground biomass decrease.