• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.460-464
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• 2007

개구리밥, 생이가래, 은행이끼, 수련, 부들 등 5종의 식물을 대상으로 카드뮴 $(Cd^{2+})$의 농도를 달리하여 처리한 후 시간별로 식물의 광합성효율을 분석하였다. 그 결과, 개구리밥, 생이가래, 은행이끼, 부들 등 4종은 카드뮴에 민감한 것으로 조사되었고, 수련은 다른 식물종에 비해 덜 민감한 것으로 나타났다. O-J-I-P 곡선의 패턴을 살펴보면, 종에 따라 다소의 차이는 있으나 개구리밥, 생이가래, 은행이끼, 부들 등 4종의 식물은 카드뮴 농도가 증가할 수록 J, I, P값이 크게 감소하는 것을 볼 수 있었다. 특히 P-단계의 감소는 개구리밥에서 현저하게 나타나 다른 3종 보다 카드뮴에 민감한 것으로 보인다. 광계II의 광합성효율(Fv/Fm) 변화양상을 보면, 개구리밥과 생이가래는 카드뮴 농도가 50uM 이상에서는 배양 1일부터 Fv/Fm값이 급격하게 감소하였으며, 은행이끼와 부들은 3일 이후부터 50uM 이상의 카드뮴 농도하에서 Fv/Fm값이 감소하였다. 수련은 큰 변화를 보이지 않았다.

• Agrochemical news magazine
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• v.23 no.5 s.178
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• pp.42-44
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• 2002

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.941-946
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• 2012

Macrophyte plays an important role in purification of wastewater. They have capacity to improve the water quality by absorbing nutrients, with their effective root system. In this study, removal of nutrient as well as organic matter was observed by some important macrophytes i.e. Pistia stratoites, Hydrocharis dubia and Salvinia sp. indepe ndently as well as in mixed culture under the laboratory condition. The highest total nitrogen removal was observed for Pistia stratoites (86.47%) in monoculture and Salvinia sp. + P. stratoites (76.11%) in mixed culture system. Corresponding figures for total phosphorous were observed for P. stratoites (75.60%) in monoculture and Salvinia sp. + P. stratoites (71.11%) in mixed culture system. Similar result was observed for ammonia removal in both systems. Additionally, P. stratoites showed the highest removal of organic matter, in monoculture system (68.46%) where as Salvinia sp. + P. stratoites showed the highest removal of organic matter in mixed culture system (82.73 %).

• Applied Microscopy
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• v.38 no.2
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• pp.117-124
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• 2008

Salvinia is an aquatic plant forming dimorphic leaves that have been modified into floating and submerged leaves. A air of floating leaves plays an important role for the floating and photosynthesis while the submerged leaves, which are lim and long, have the form and function of root. Many aquatic plants develop trichomes in the epidermis but in Salvinia, richomes grow densely in the epidermis of the dimorphic leaves. The present study examined the differentiation pattern of trichomes developing in the floating leaves of S. natans and S. molesta by scanning and transmission electron microscopy. Trichomes developing in the floating leaves of Salvinia showed very different patterns. In S. natans, they were arranged in a V-shape form, having 20${\sim}$25 rows at $18{\sim}25^{\circ}$ on both sides of the lamina divided by the midrib in the floating leaf. In each row, 8${\sim}$10 oval-shaped cells, $200{\sim}290{\mu}m$ in length, were arranged in a spiral fashion. Four trichomes of this form made a trichome unit, but their apical parts were separated from one another and developed into the so-called 'knuckle-crane' type. On the other hand, in S. molesta, trichomes differentiated in a unique pattern quite different from those of S. natans. At the early stage of differentiation, trichomes protruded from the epidermis and then 4${\sim}$6 cylindrical cells grew $400{\sim}600{\mu}m$ long and the four trichomes formed as an unit. The four grouped trichomes were interconnected through their apex and developed in the 'egg-beater' type. Then $300{\sim}600{\mu}m$ long multi-cellular stalk cells grew and protruded out of the epidermal surface from the basal part of the trichomes. Such a structural characteristic of trichomes is considered to play a very important role along with the aerenchyma tissue in the leaf mesophyll tissue for the floating of Salvinia on the water surface.

• 한국전자현미경학회:학술대회논문집
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• 2001.11a
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• pp.37-38
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• 2001

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2008.11a
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• pp.159-161
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• 2008

중금속에 대한 식물의 내성여부와 중금속 스트레스하에서 식물의 생리적 특성을 파악하기 위해 좀개구리밥, 생이가래, 은행이끼, 수련, 부들 등 5종의 식물을 대상으로 카드뮴(Cd$^{2+}$)의 농도를 달리하여 처리한 후 시간별로 식물의 광합성효율을 분석하였다. 그 결과 좀개구리밥는 카드뮴에 가장 민감하게, 생이가래와 은행이끼 등은 조금 민감하게 반응하였으며, 수련 등은 다른 식물종에 비해 덜 민감한 것으로 나타나고 있다. 좀개구리밥은 카드뮴 농도가 증가할수록 정상적인 O-J-I-P 곡선에서 J, I, P의 값이 큰 폭으로 떨어지고 있으며, 이는 카드뮴 농도가 증가할수록 명반응 중심이 손상을 입거나 어떤 원인에 의해서 불활성됨으로써 광합성 효율 즉 Fv/Fm의 감소를 일으키기 때문이다.

• Applied Microscopy
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• v.32 no.4
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• pp.319-327
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• 2002

Salvinia natans, an unique water fern having a small rootless body, developed three different types of trichomes throughout the plant. The most peculiar type exhibiting rows of obvious, whitish, multicellular trichome clusters was noticed in the upper surface of the floating leaves. Eight to ten branches within a cluster extended ca. $370{\sim}420{\mu}m$ from the leaf surface. No stalk cell was found, however, four large epidermal cells were discernable at the base of four central branches in the cluster. Each branch consisted of $8{\sim}10$ obliquely-oriented small cells that gradually decreased in size toward the branch tip. The second type was found in the lower surface of the floating leaves, stems, and sporocarps. Multicellular uniseriate trichomes, ca. $430{\sim}980{\mu}m$ long, were distributed all over these structures. The tip of trichome was acicular, but a semi-spheric protuberance of approximately $24{\sim}32{\mu}m$ in diameter occurred at the base of each trichome. The protuberance appeared to be firmly attached to the side of the basal cell, however, internal connection to the trichome cell itself was uncertain. The third type was similar to the second in that multicellur uniseriate trichomes with acicular tip and a protuberance at the base were present. However, the trichomes were considerably long relative to the second type, and only occurred along the surface of highly dissected, submerged leaves. A majority of the trichomes exceeded more than 2 mm in length that hung downward in the water. Regardless of trichome type, all trichomes contained a huge central vacuole with very thin cytoplasm, resulting from the fusion of several vacuoles during early trichome development. The various densely-distributed trichomes formed in Salvinia natans probably play an important role in plant buoyancy.

• Korean journal of applied entomology
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• v.46 no.1 s.145
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• pp.13-18
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• 2007

Morphological characters of adult and immature stages on Elophila turbata (Butler, 1881) belonging to subfamily Nymphulinae, family Crambidae are redescribed base on Korean materials. Also we observed biological characters of this species including host plants, Spirodela polyrhiza(L.) Schleiden, Salvinia natans ($Linn\acute{e}$) Allioni and Lemna perpusilla Torre. And, photographs of adult, genitalia and immature stages are provided.

• The Korean Journal of Pesticide Science
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• v.9 no.3
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• pp.205-213
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• 2005

This study was conducted to evaluate the response of the selected aquatic plants to sulfonylurea(SU)-herbicides, which have been used widely in rice-cultivating areas in Korea, and the possibility of using them as bio-indicator species for biodiversity conservation. The aquatic plants identified in Kangwon province where butachlor have been used extensively for many years were much more varied than those in Chonnam where SU-herbicides have been used extensively for many years. The growth responses of Monochoria korsakowii, Marsilea quadrifolia and Salvinia natans to sulfonylurea herbicides such as bensulfuron-methyl(BSM) and pyrazosulfuron-ethyl(PSE), were much more sensitive than those to butachlor and molinate. The $GR_{50}$ values of BSM and PSE for M. korsakowii, M. quadrifolia and S. natans were relatively very low when compared with those of butachlor and molinate. The number of internode and dry weight of M. quadrifolia which was exposed to herbicides runoff from rice fields were seriously affected. The acetolactate synthase(ALS) activities of M. quadrifolia sensitively inhibited by BSM and PSE were, and $I_{50}$(Inhibition 50%) were 5.6 and 2.1 nM, respectively.

• The Korean Journal of Mycology
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• v.43 no.2
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• pp.92-98
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• 2015

Hydrocharis dubia Backer and Salvinia natans All. were sampled from the Junam and Dongpan reservoirs, representative freshwater wetlands of Korea. A total of 19 endophytic fungal strains were isolated from hydrophytes native to the Junam wetlands and 5 strains were isolated from the Dongpan wetlands. Depending on phylogenetic analysis based on internal transcribed spacer (ITS) region, strains from Junam belonged to 11 genera and from Dongpan belonged to 5 genera. Fusarium, Phoma and Talaromyces were commonly distributed genera from two wetlands. The fungal diversity index showed clear differences between each wetlands or each host hydrophyte. Above all, the highest diversity value was observed from Salvinia natans All., which have been reported as promising biological resources as eutrophication controller in environmental ecology.