• Environmental engineer
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• v.25 s.261
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• pp.12-12
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• 2008

• Korean Journal of Environment and Ecology
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• v.31 no.3
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• pp.287-296
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• 2017

In order to check host plant diversity and to confirm the potential risk to be invaded, we documented host plant flora and plant part of C. pentagona, an invasive parasitic plant in field survey and induced parasitic infection by them in the laboratory experiment. Parasitic interaction(12% of total tree species) was found in twig and leaf of tree such as Quercus mongolica and Abies holophylla that was not developed into ligninfication. There were most host plant species belong to Compositae, but the species parasitic rate of family was higher in Cyperaceae, Polygonaceae and Leguminoceae. Through the inducible infection experiment with C. pentagona, all species except one species show parasitic interaction between host plan and C. pentagona. These result means that the limiting stage for invading area is dispersion process for invading other area in Korea. Infection plant part by C. pentagona was dominantly both shoot and leaf, rather than only leaf or only shoot. We found newly 12 families and 45 host plant species including 33 herbacious one and 12 woody one. Crop plant such as Setaria italica and 6 endangerd one such as Scrophularia takesimensis, especially the later rare endemic plant was to death by parasitic infection of C. pentagona. These results indicate that C. pentagona is potential risk to both wild and cultivated plant in Korea.

• Journal of Plant Biology
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• v.2 no.1
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• pp.56-60
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• 1959

• Journal of Plant Biology
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• v.1 no.1
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• pp.21-26
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• 1958

• Korean Journal of Plant Resources
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• v.19 no.5
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• pp.617-627
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• 2006

The wild plants of the studied area in the Gosan recreational forest was listed 327 taxa: 99 families, 252 genera, 289 species,1 subspecies, 34 varieties and 3 forms. Based on the list of the rare plants by the Forest Research Institute, 2 taxa were recorded in the studied areas; Lilium distichum (Presevation priority order: No. 159), Aristolochia contorta (No. 151) and based on the list of Korean endemic plants, 4 taxa were recorded; Cephalotaxus koreana, Carex okamotoi, Salix purpurea var. japonica, Weigela subsessilis. Specific plant species by floral region were total 21 taxa; 2 taxa (Asperula lasiantha, Lonicera subhispida) in class III, 4 taxa (Lilium distichum, Potentilla dickinsii, Caryopteris incana, Ligularia fischeri) in class II, 15 taxa (Hosta capitata, Alnus hirsuta, Ribes mandshuricum, Cayratia japonica, Vaccinium oldhami, etc.) in class I. The naturalized plants in this site were 12 families, 28 genera, 31 species, 1 varieties, 32 taxa and naturalization rate was 9.8%. So, wild plants disturbing ecosystem like Ambrosia artemisiifolia var. elatior have been increasing and it needs continuing control and conservation measures on the plant ecosystem.

• Korean Journal of Plant Tissue Culture
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• v.27 no.3
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• pp.219-226
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• 2000

Lycopersicon peruvianum has a gametophytic self-incompatibility (GSI) mechanism controlled by a single genetic locus (S locus) with multiple alleles. S RNases, an allelic series of abundant stylar proteins, are products of the S locus in L. peruvianum and other Solanaceous plants. The $S_{11}$ RNase gene from L. peruvianum was introduced into a self-compatible (SC) species (Lycopersicon esculentum) to examine whether the expression pattern in the heterologous host mimics that in L. peruvianum. The resultant transgenic L. esculentum plants expressed the introduced gene highly in their styles, which is similar manner to the expresion in L. peruvianum. The $S_{11}$ RNase gene was expressed in the syle at a similar stage of flower development in both transgenic plants of L. esculentum and L. peruvianum without any morphological changes.

• Korean Journal of Plant Resources
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• v.23 no.1
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• pp.25-30
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• 2010

This study was carried out to understand the effect of low temperature($4^{\circ}C$), heat shock($37^{\circ}C$) and drought stresses on the growth and gene expression of Arabidopsis ATSIZ3(at1g08910) mutants. The seedling growth of SIZ3-mutants were markedly inhibited by the treatment of heat shock or chilling stresses. However, there was no significant differences between wild type and SIZ3-mutants in seeding fresh weight. As compared to wild type plants, SIZ3-mutants showed 63.9% inhibition of seedling fresh weight by the treatment of 10 days drought stress, suggesting that SIZ3 is involved in the resistance of Arabidopsis to drought stress. Base on RT-PCR analysis, expression of SIZ3 mRNA in the wild type showed 20% inhibition by chilling stress, 3.7 and 4.5 fold increase by the treatment of heat shock or drought stresses, respectively.

• Research in Plant Disease
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• v.30 no.2
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• pp.148-156
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• 2024

Ralstonia pseudosolanacearum, a plant pathogenic bacterium that can survive for a long time in soil and water, causes lethal wilt in the Solanaceae family. Sigma S is a part of the RNA polymerase complex, which regulates gene expression during bacterial stress response or stationary phase. In this study, we investigated the role of sigma S in R. pseudosolanacearum under stress conditions using a rpoS-defective mutant strain of R. pseudosolanacearum and its wild-type strain. The phenotypes of rpoS-defective mutant were complemented by introducing the original rpoS gene. There were no differences observed in bacterial growth rate and exopolysaccharide production between the wild-type strain and the rpoS mutant. However, the wild-type strain responded more sensitively to nutrient deficiency compared to the mutant strain. Under the nutrient deficiency, the rpoS mutant maintained a high bacterial viability for a longer period, while the viability of the wild-type strain declined rapidly. Furthermore, a significant difference in pH was observed between the culture supernatant of the wild-type strain and the mutant strain. The pH of the culture supernatant for the wild-type strain decreased rapidly during bacterial growth, leading to medium acidification. The rapid decline in the wild-type strain's viability may be associated with medium acidification and bacterial sensitivity to acidity during transition to the stationary phase. Interestingly, the rpoS mutant strain cannot utilize acetic acid, D-alanine, D-trehalose, and L-histidine. These results suggest that sigma S of R. pseudosolanacearum regulates the production or utilization of organic acids and controls cell death during stationary phase under nutrient deficiency.

• Korean Journal of Plant Tissue Culture
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• v.25 no.2
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• pp.119-123
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• 1998

In order to investigate the possibility of in vitro mass propagation via somatic embryogenesis from Sicyos angulatus L., effects of plant growth regulators and carbon sources on callus induction and somatic embryogenesis were evaluated. Optimal combinations of plant growth regulator for callus induction from cotyledon and inflorescence explants were 2,4-D 2.0 mg/L + BA 0.1 mg/L and 2,4-D 1.0 mg/L + BA 0.1 mg/L in MS basal medium supplemented with sucrose 30 g/L,, respectively. Somatic embryogenesis was observed from cultured inflorescence explants, but it could not be achieved from leaf or cotyledon explants. The most effective plant growth regulators for somatic embryogenesis from callus was NAA 1.0 mg/L + kinetin 10 mg/L in the half strength of MS basal medium supplemented with 20 g/L sucrose.

• The Korean Journal of Ecology
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• v.25 no.5
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• pp.275-282
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• 2002

Preference of food plants of wild birds was shown in the order of Pinus densiflora, Celtis sinensis, Celastrus orbiculatus, Rosa multiflora, Taxus cuspidata, and Euonymus japonica, etc. The wild birds preferred the animal food(92.2%) rather than the vegetable food(32.7%) in breeding season(May through June), but preferred both animal and vegetable foods in non-breeding season(November through December). The rates utilzing artficial nest were 77.5%, 50.3%, 44.1% and 42.2% in Nosan, Sanho, Chinju-castle and Bibong parks, respectively. The wild birds used more the 3cm hole than 5cm hole.