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오창호,이태수,이상선,백기엽 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 1998 연구보고서 Vol.3 No.-
한국의 춘란 자생지의 춘란(Cymbidium goeringii) 뿌리에서 공생하는 10개의 균근균을 분리하였다. 분리된 난 균근균을 PDA에서 배양한 결과 균총은 다양한 색깔을 나타내었으며, 생장 속도도 달랐다. 분리된 난 균근균을 현미경으로 관찰한 결과 Rhizoctonia repens 또는 R. endophytica var endophytica로 동정되었다. R. repens는 자생란인 춘란의 뿌리에서 많이 분리되었으며, R. endophytica var endophytica는 상업적으로 재배되는 외국산의 난 뿌리에서 분리되었다. 분리된 균들 중에 R. repens와 유사한 5개의 분리균을 oatmeal agar에 접종하고 배양한 후 여러종의 난 유묘를 이식하여 난의 생장을 관찰하였다. 그 결과 난의 생장은 분리 균에 따라서 다양하였으나 대부분의 난은 생장촉진 반응을 나타내서, 분리균과 각각의 난과의 공생 관계를 관찰할 수 있었다. Ten isolates of the orchid mycorrhizal fungi were isolated from the roots of Korean native orchid plants (cymbidium goeringii) which inhabitate mainly in southern and western areas of Korea. The growth rates and color of the isolates in potato dextrose agar (PDA) were various. Microscopic observations of the hyphae isolated were identified as Rhizoctonia repens and R. endophytica var endophytica or their related species. R. repens was isolated from the roots of the Korean native orchids, but R. endophytica var endophytica was only isolated from the roots of the commercial orchids introduced from foreign countries. Also, the polymorphic patterns of genomic DNA extracted from selected isolates were compared with those of DNA extracted from the orchid mycorrhizal fungi isolated previously and similar band patterns were observed among those isolates. Five isolates of R. repens were selected and cultured at the oatmeal agar for investigating their symbiosis with orchid plants. The symbiotic specificity between orchid plants and isolated orchid mycorrhizal fungi was observed by growing orchids about six months in the greenhouse. The symbiotic responses of the commercial orchid plants with selected isolates were quite different from different isolates due to the genetic variations.
온실에서 동양란인 심비디움 재배에 공생균의 효과에 관한 연구
이상선,이준기,이정우,박소영,백기엽 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-
The orchid symbiotic fungus (Tulsanella repens P-01; OSF) was cultured on the soil materials by solid culture and inoculated in the two varieties of GwanUm and SaGae of Cymbidium hybrids with the barks. The two varieties of the oriental orchid were measured after 12 months' cultivation under the conditions of greenhouse; fresh weight, numbers of bulb, and rate of dead bulb for an individual plant. The fresh weight of plants were measured to be different for the individual plant. The fresh weight of plants were measured to be different for the individual plants treated with the OSF or not, depending on the varieties, but the rates of dead bulb were significant, disregarding with the varieties. The roots of the plants treated were observed to be more health and heavier weight than those not treated. The bulbs of the plants not treated were measured to be dead at the rate of 20% for a year's cultivation. The roots of two varieties were also observed by naked eyes and by microscope; Several peletons were observed to be in the root cells in the individual plants treated with OSF, but not in the individual plants treated without the OSF. Further, the pathogenic fungal hyphae were observed to be in the roots under the dead bulbs of both varieties not treated; appessorium or hasutorium on the epidermal cells of root. The inoculation of OSF was speculated to stimulate the growth of plants by absorption of mineral nutrition and defense the invasions of soil pathogenic fungi for the cultivations of Cymbidium hybrids.
난 자생지 토양이 조직배양한 춘란과 한란의 생장에 미치는 영향과 난 공생균의 관찰
김태중,이상선,박성수,백기엽 충북대학교 한국과학재단 지정 첨단원예기술개발연구센터 1996 연구보고서 Vol.1 No.-
현재, 난재배가들이 사용하는 다양한 용토와 춘란자생지 용토를 사용하여 춘란과 한란을 재배하였다. 용토 실험에서 자생지 토양과 바크가 춘란 재배에 가장 좋았으며, 한란재배에서도 비멸균한 토양에서 동일한 결과를 얻었다. 이러한 난생장과 관련되는 난뿌리에서는 난균근 형성과 관련되는 것으로 나타났다. 난균근이 형성되는 난뿌리 부분에서 질소 함량이 높게 측정되어, 이는 질소성분이 난생장에 효과적으로 작용하였다고 생각되었다. 이상의 결과를 근거로하여 난의 자생을 미친다는 것과 난균근의 차이점을 파악하였다. 또한 난균근 형성에서 난균근과 난의 상호관계에서 숙주와 균의 특이성을 관찰하였다. 본실험에 사용된 춘란자생지 토양에서는 최소한 동양란에 관련되는 공생균이 최소한 두 개 이상이라는 것을 밝혔으며, 이에 대한 공생과정도 서로 다를 것이라는 것으로 추측되었다. The temperate and terrestrial orchids of C. goeringii and C. Kanran were cultivated for 16 months under the conditions of green house, using the various culture media and the soils collected from Korean native orchid inhabiting areas (KNOA). The growth of C. goeringii were observed to grow well in the pine bark and the soil of KNOA as culture medium, and to form orchid mycorrhizae in the roots. The plantlets of C. kanran grew better in the non-sterilized soils than in the sterilized soils collected from two different KNOA. The values of total-nitrogen of the roots grown in the non-sterilized soils were measured to be higher than those in the other culture media, and even though higher than those of the shoots grown in the same soils. These growths of young plantlets of C. goeringii and C. karnan were revealed to be related to the orchid mycorrhizae, and speculated to be involved in the metabolism of nitrogen sources. Thus, based on this result, the soils of KNOA were collected from various areas, mainly Southern and Western Korea, and applied to cultivations of three different orient orchid plants. The formation of orchid mycorrhizae (mainly peletons in the root cells) and the periods of infection by orchid mycorrhizal fungi (8 to 12 weeks) were different for three different orchid plants. Host specificity were speculated to be resulted from the interactions between orchid plants and fungi. Also, more than two types of fungus were, at least, confirmed to be involved in the orchid mycorrhizae for the oriental orchids.
백기엽,오창호,선정훈,이상선 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 1997 연구보고서 Vol.2 No.-
For cultivations of orchid plants, the Korean native orchid plant inhabiting (KNO) soils were collected from the Southern and Western areas in Korea, and employed for understanding the role of symbiotic fungi on the orchids. The parameters related to growth of the orchid plant were investigated after the young nurseries (plantlets) of Cymbidium goeringii, C. kanran, and Neofinetia falcata planted on the sterilized or unsterilized soils of KNO under the conditions of green house. The fresh weights or dried weights of all orchid plants grown on the unsterilized soil for 17 months were highly heavier than those grown on the sterilized soils. Thus, the differences of the plant growth were not found among the four different KNO soils. The various stages of peletons in the root cells of the orchid plants were distinguished from unsterilized soils, while those not quite often in the sterilized soils. Mineral nutrients (K, Ca, Mg, P) related to nitrogen were also measured in the individual plantlets for understanding the plant symbiosis. The nitrogen of the orchid plants absorbed in the unsterilized soils were measured to be comparatively greater than those in sterilized soils during the orchid plant growth. The other minerals of the orchid plants absorbed in the unsterilized soils were also measured to be comparatively greater than those in the sterilized soils. The metabolism of nitrogen were concluded to be much important, and were considered to stimulate the other mineral absorptions in growth of the orchid plants symbiotic with the fungi.