지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2017.10
- 수록면
- 7 - 10 (4page)
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초록· 키워드
오류제보하기
Phytophthora and Pythium are commonly known as water molds, and can cause enormous losses to many floriculture and vegetable crops worldwide, including seedling damping-off, stunting, crown, stem and root rot as well as environmental damage in natural ecosystems. It is challenging to control these pathogens because plants are infected and do not show symptoms until the disease is too advanced to respond to treatment. The pathogens can also easily develop resistance to effective fungicides. Recycled water irrigation system is getting popular in the United States and worldwide because there are benefits for both environmental and economic perspectives. However, this practical system can aggravate their transmission in the greenhouse. To deal with the problem, various physical and chemical disinfection methods have been proposed to control recirculation of contaminated nutrient solution in the greenhouse. These methods, however, have shown problems, such as high cost of installation or maintenance and environmental damage.
In this regard, my first study investigated the transport and retention of Phytophthora. capsici zoospores in saturated columns packed with iron oxide coated sand (IOCS) or uncoated sand in Na<SUP>+</SUP> or Ca<SUP>2+</SUP> background solution at pH 7.2 or 4.4, in combination with XDLVO interaction energy calculations and microscopic visualizations. Significantly more encysted zoospores were retained in IOCS than in uncoated sand, and at pH 4.4 than at pH 7.2, which likely resulted from increased electrostatic attraction between zoospores and grain surface. At pH 7.2, up to 99% and 96% of the encysted zoospores were removed in IOCS and uncoated sand, respectively, due to a combination of strong surface attachment, pore straining, and adhesive interactions. Motile biflagellate zoospores were more readily transported than encysted zoospores, thus posing a greater dispersal and infection risk.
The second and third studies were conducted in greenhouses to demonstrate a proof-of-concept of using fast-flow filtration to control Pythium and Phytophthora and Pythium diseases in greenhouse floriculture and vegetable crops. The second study showed that Pythium aphanidermatum could be effectively removed by the sand and AC filters during fast-flow filtration with low water pressure. The rapid sand filter had the best performance because no decrease in the poinsettia quality was observed when compared to the non-inoculated control plants. Because the AC filter can also remove the essential nutrients from the irrigation water, and cause the Fe deficiency in the poinsettias, it is less desirable to be used unless the nutrients can be supplied separately instead of through irrigation water. The third study found that the filter with iron oxide coated media [IOCM] could effectively protect the squash plants from Phytophthora capsici, but caused the nutrient deficiency in the squash. The sand filter could not prevent, but only slow the disease development in the squash. Again, it shows that the IOCM filter has the potential to be used in treating irrigation water in the greenhouse vegetable production, but the sufficient nutrients need to be provided. Overall, the results suggested that physical removal of pathogens using fast-flow filtration can overcome many limitations of fungicide application, and may be a promising alternative for disease management in the greenhouses.
In this regard, my first study investigated the transport and retention of Phytophthora. capsici zoospores in saturated columns packed with iron oxide coated sand (IOCS) or uncoated sand in Na<SUP>+</SUP> or Ca<SUP>2+</SUP> background solution at pH 7.2 or 4.4, in combination with XDLVO interaction energy calculations and microscopic visualizations. Significantly more encysted zoospores were retained in IOCS than in uncoated sand, and at pH 4.4 than at pH 7.2, which likely resulted from increased electrostatic attraction between zoospores and grain surface. At pH 7.2, up to 99% and 96% of the encysted zoospores were removed in IOCS and uncoated sand, respectively, due to a combination of strong surface attachment, pore straining, and adhesive interactions. Motile biflagellate zoospores were more readily transported than encysted zoospores, thus posing a greater dispersal and infection risk.
The second and third studies were conducted in greenhouses to demonstrate a proof-of-concept of using fast-flow filtration to control Pythium and Phytophthora and Pythium diseases in greenhouse floriculture and vegetable crops. The second study showed that Pythium aphanidermatum could be effectively removed by the sand and AC filters during fast-flow filtration with low water pressure. The rapid sand filter had the best performance because no decrease in the poinsettia quality was observed when compared to the non-inoculated control plants. Because the AC filter can also remove the essential nutrients from the irrigation water, and cause the Fe deficiency in the poinsettias, it is less desirable to be used unless the nutrients can be supplied separately instead of through irrigation water. The third study found that the filter with iron oxide coated media [IOCM] could effectively protect the squash plants from Phytophthora capsici, but caused the nutrient deficiency in the squash. The sand filter could not prevent, but only slow the disease development in the squash. Again, it shows that the IOCM filter has the potential to be used in treating irrigation water in the greenhouse vegetable production, but the sufficient nutrients need to be provided. Overall, the results suggested that physical removal of pathogens using fast-flow filtration can overcome many limitations of fungicide application, and may be a promising alternative for disease management in the greenhouses.
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UCI(KEPA) : I410-ECN-0101-2018-523-001420218