• Journal of Plant Biology
• /
• v.21 no.1_4
• /
• pp.39-44
• /
• 1978

Acid phosphatase activities were analyzed in $\mu\textrm{g}$ tissue samples from an angiosperm parasite (Cuscuta cephalanthi) and its host plant (Hedera helix) by a fluorometric microtechnique. The apex and the coiling portion of the parasite axis exhibited greater enzyme activies than other portions of the hypha. Acid phosphatase activity in the haustorium was 2-3 times that in the hyphal axis. The vascular bundles of the normal host exhibited the greatest enzyme activity. The acid phosphatase activity in the host infected by the parasite decreased to the activity level of the haustorium.

• Animal Systematics, Evolution and Diversity
• /
• v.18 no.1
• /
• pp.127-133
• /
• 2002

Macromyzus woodwardiae(Takahashi, 1921) is recognized on Cyrdomium falcatum(L.f.) C. Presl (Dryopteridaceae), a htherto unknown host plant, from Jeju Island, Korea. Apterous viviparous female and alate viviparous female are described. This is the first record of genus Macromyzus in Korea.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2007.11a
• /
• pp.355.2-355.2
• /
• 2007

• Korean journal of applied entomology
• /
• v.52 no.4
• /
• pp.327-333
• /
• 2013

Plant parasitic nematodes were isolated from 274 soil samples collected from soybean fields in Korea. Nematode importance rating in soybean is proposed based on this study and by reviewing other reports. Soybean cyst nematode, Heterodera glycines is the most important nematode species and rated as $1^{st}$ because it detected from 38%(range 25-51%) of soil samples with high density except Jeju province. Root-knot nematode, Meloidogyne spp. is rated $2^{nd}$ and is more widely distributed in southern provinces, Gyeongnam, Jeonnam, and Jeju province (detection rate ranged 16-44%). Pratylenchus is rated $3^{rd}$ and is more frequently detected from northern provinces such as Gyeonggi and Gangwon (detection rate ranged 10-13%). Helicotylenchus is rated $4^{th}$ and is particularly important in Jeju province (detection rate is 62% and numbers averaged 571 nematodes/$300cm^3$ soil), which is the main production area for sprouting soybean in Korea. Tylenchorhynchus, Paratylenchus, Criconema, Criconemoide, Mesocriconema, Ogma, Xiphinema, Paratrichodorus, and Trichodorus occur in low frequency and density, thus they are rated to $5^{th}$. We propose to delete following nematode genus from the list of soybean parasitic nematode in Korea because their parasitism on soybean is unconfirmed or negligible; Tylenchus, Aphelenchus, Aphelenchoides, Ditylenchus, Hirschmanniella immamuri, Basiria graminophila, Psilenchus, and Pseudhalenchus. Therefore, we revised 30 species in 16 genera as soybean parasitic nematodes in Korea. Importance rating is $1^{st}$ Heterodera glycines, $2^{nd}$ Meloidogyne spp., $3^{rd}$ Pratylenchus spp. and $4^{th}$ Helicotylenchus spp. especially in Jeju province.

• Korean Journal of Plant Resources
• /
• v.22 no.2
• /
• pp.136-144
• /
• 2009

Germination tests on 3 species that have potential for use as sprout vegetables, such as Coreopsis tinctoria, Saussurea pulchella, and Matricaria recutica, were conducted for 20 days under different temperatures of $15{\sim}30^{\circ}C$, and conditions of light and dark. C. tinctoria showed germination of 83% under $15^{\circ}C$ and dark condition after 4 days, S. pulchella 51.7% under $25^{\circ}C$ and light condition after 20 days, and M. recutica 90.3% under $25^{\circ}C$ and dark condition after 4 days. To investigate optimum plantlet size before greening treatment, seeds germinated were allowed to grow under darkness. The optimum growth of C. tinctoria was obtained under $30^{\circ}C$ after 5 days, S. pulchella under $25^{\circ}C$ after 6 days, and M. recutica under $20^{\circ}C$ after 6 days. Greening treatment resulted in diminished longitudinal growth, but C. tinctoria and S. pulchella showed more vigorous latitudinal growth. Days required before marketing as sprout vegetables were different according to species - Three days of greening was good for C. tinctoria, 2 for S. pulchella, no greening for M. recutica. Generally, tightly sealed containers for minimum water loss were recommended for storage of sprout vegetables after harvest. However, storage methods for each species were different depending on various factors like temperature of storage, presence of ventilation holes of storage packages and forms of marketing. More detailed research for above 3 species is proposed.

• Research in Plant Disease
• /
• v.22 no.4
• /
• pp.249-256
• /
• 2016

To investigate the incidence of plant-parasitic nematodes from plastic-house fields of strawberry, 170 soil samples were collected from the main producing area of strawberry in Korea from 2014 to 2015. Based on the investigation, root-lesion nematode (RLN; Pratylenchus spp.) and root-knot nematode (RKN; Meloidogyne spp.) are the most important pests in plastic-house fields of strawberry with 57% and 36% incidences, respectively. Among the collected fields, 96 and 63 fields were infected RNL and RKN, respectively with 44 fields (38.8%) being detected at both nematode. High degree of incidence of both nematodes were observed in the regions of Jinju, Gyeonnam Province, Korea. For identification of species level, phylogenetic and distance analysis were performed using RLN and RKN isolates generated from the regions of Jinju. The results indicated that the RLN and RKN isolates were Pratylenchus vulnus and Meloidogyne hapla, respectively. This study showed that P. vulnus and M. hapla could be most dominant species in plastic-house fields of strawberry. This data will provide basic knowledge for development of effective control strategies.

• Korean Journal of Plant Taxonomy
• /
• v.43 no.4
• /
• pp.252-262
• /
• 2013

During the floristic survey on Phnom Bokor National Park, Kampot, Cambodia, we encountered Balanophora fungosa var. indica, which is a tropical holoparasitic plant. To identify its host species, we collected host roots and trees nearby and tried to identify them using DNA barcoding approach. We applied plastid rbcL and matK gene regions as DNA barcode markers, and successfully amplified and sequenced the markers from 15 host roots and seven tree samples. Obtained host root sequences were identified as Primulaceae, Celastraceae, Myrtaceae, and Oleaceae, while trees nearby are Oleaceae, Myrtaceae, Sapindaceae, Rosaceae, Clusiaceae, Ericaceae, and Lauraceae. At genus level, host species are identified as Myrsine, Euonymus, Syzygium, and Olea, but failed in species discrimination. Myrsine (Primulaceae) and Olea (Oleaceae) are reported here as host species of B. fungosa var. indica for the first time. Further sampling and comparative work, and DNA barcoding will help recognize the biodiversity of the area and host species of Balanophora, together with their evolution.

• Korean journal of applied entomology
• /
• v.42 no.2
• /
• pp.169-171
• /
• 2003

The life history and natural enemies of Coleophora obducia Meyrick which is a defoliating pest of Larix leptolepis were studied mainly in Chungchongbuk Province. Larix leptoiepis was the only host plant of this pest. Coleophora obducia had one generation per you and the adults emerged from mid May to late May with a peak emergence around May 14th. The mean number of eggs in an ovary was 44.5 and most females oviposited one egg on each needle. The duration of the egg stage was about two weeks. Larvae passed the winter in a pouch made by spinning the needles. Pupation began in the late April, and the pupal period was two weeks on average. The natural enemies observed were parasitoids and predators.

• Korean Journal Plant Pathology
• /
• v.14 no.6
• /
• pp.622-624
• /
• 1998

During the course of study on plant parasitic nematodes associated with medicinal herbs in Korea, high population of different stages of citrus nematode, Tylenchulus semipentrans was found in association with Pyrola japonia Klenze in Imsil, Chunbuk province. The second stage larvae and males were isolated from rhizosphere soil ; immature and mature females were detached from the roots of infested plants of Pyrola japonica. Besides citrus it has been reported to parasitize on roots of Syringa vulgaris, Diospyros lotus, olive, grapevine, and pear in different parts of the world. This is the first record of T. semipenetrans parasitized on a medicinal plant, Pyrola japonica.

• Journal of Wetlands Research
• /
• v.14 no.1
• /
• pp.101-120
• /
• 2012

We investigated the ecological characteristics of Jilmoe-neup conservation area which is one of wetlands designated as a Ramsar convention site in Mt. Odae from 2007 to 2011. Average out-flow of water was 0.80 $m^3/min$ during observation period. Average pH of water was 6.1, electric conductivity was 19 ${\mu}S/cm$ and contents of potassium, calcium and ammonium, nitrate and available phosphorus in water were recorded below average 2.0 mg/L. Peat layer was less developed than in other montane wetlands such as Yong-neup and Wangdeungjae-neup. Plants were recorded as 49 family, 118 genus, 163 species, 3 subspecies, 29 variety and 6 forma, total 163 taxa. Trientalis europaea L., which was designated in endangered level 2 by Ministry of Environment, inhabited at Sphagnum dominated area and Carex tussocks. Vegetation analysis showed that dominance value was changed as species distribution area were increased or decreased periodically. Although Jilmoe-neup deserved conservation value for Sphagnum fen which has diverse flora, it was affected from various factors such as ranch in the vicinity. Therefore, it must be monitored and managed continuously.