In this study, we investigated the amino acids content of shiitake mushrooms grown in eight different media and under three different temperature conditions. The sawdust media were supplemented with 4 kinds of nutrients - rice bran, barley, bean curd refuse, and red ginseng refuse in an 8:2 ratio with or without 0.5% calcium chloride, and the fruiting temperature was set to low (13–15oC), medium (18–20oC), or high temperatures (24–26oC). Seventeen amino acids were detected, and the content varied depending on the compositions of the media. The highest total amino acid content (209.7 mg/g) was measured in mushrooms from the media with red ginseng refuse, and the glutamic acid content was the highest (51.3 mg/g) in mushrooms from the media with barley. In terms of fruiting temperature, the amino acid content was the highest (38.2%) at medium temperature followed by the content at low (32.5%) and high temperature (29.3%). The amino acid composition of shiitake mushrooms was similar between the medium and low temperature conditions.

표고 “수향고”는 Di-mon 교잡에 의해 육성되어 품종으로 등록요건에 적합한 조건시험을 거쳐 품종출원 되었다. 균사생장은 25℃에서 가장 우수하였다. 버섯의 형태는 평반구형의 대엽, 후육으로 갓직경은 약 52㎜이고 갓의 두께는 약 17mm이다. 주름살 측면은 평활형이며 주름살 폭은 보통으로 갓과 대의 위치는 중심생이고 갓의 가장자리에 인피가 있다. 도목살수에 의한 버섯발생에 적합한 품종으로 집중발생형이다. 버섯의 발이온도는 18~28℃로 발생시기가 6월, 8~9월인 고온성 품종이다. 재배시험지에서 4년간 140kg/㎥의 표고가 생산되었다.

New shiitake (Lentinula edodes) strains “Dasanhyang”, “Chunjang-1ho” and “Poongnyunko” were breeded for bed-log cultivation. Fruit-body production of “Dasanhyang” was most at summer and autumn. The total amount of fruit-body production during 4 years(one generation) was 31kg/㎥ log. The fruit-body is hemispherical shape, brown colored and diameter of pileus is ca. 54 mm. Optimal temperature of fruit-body formation was 14~2 2℃, and the fruiting is concentrated. Fruit-body production of “Chunjang-1ho” was most at spring and autumn. Optimal temperature of fruit-body formation was 12~22℃ and range of fruiting temperature is broad. The diameter of pileus is ca. 46 mm. The fruiting is concentrated, and the total amount of fruit-body production during 4 years(one generation) was ca. 18kg/㎥ log. Fruit-body production of “Poongnyunko” was most at summer and autumn. Optimal temperature fruit-body formation was 17~24℃. It is high-temperature type strain. The diameter of pileus is ca. 46 mm. The total amount of fruit-body production during 4 years(one generation) was 22kg/㎥ log.

A harmful fungus occurred seriously in bed-log of shiitake(Lentinula edodes) in Jangheung-Gun, Korea. The fungus was identified as Bjerkandera adusta by its morphology and ITS(Internal Transcribed Spacer) analysis. The fungus was reported as causal agent of stem-rot of Populus euramericana in Korea, but not reported in bed-log of shiitake until this notification. Thus, studies were made to investigate inside condition of bed-log of shiitake damaged by B. adusta, physiological characteristics of B. adusta and antagonism between these two fungi. First of all, B. adusta is white-rotting fungus like shiitake and wood-rotting condition is similar to that of shiitake. But, there are a lot of small spots in damaged wood tissue under bark which are not seen in case of shiitake. Optimal temperature for mycelial growth of B. adusta is ca. 30℃ while that of shiitake is ca. 25 ℃. When confrontation cultures were made between these two fungi under 15℃, 20℃, 25℃ and 30℃, B. adusta has antagonistic ability against shiitake in all the temperatures. From the results of experiments, if the bed-logs of shiitake are exposed to high temperature, there should be mass propagation of B. adusta, and shiitake mycelia will be seriously injured by the fungus. Therefore, to prevent the damage by B. adusta, it is needed to grow the mycelia of shiitake fast in the bed-log, and to avoid exposure of the bed-log to high temperature in summer.

For diversification of materials for sawdust cultivation of Lentinula edodes, this study was carried out to examine adding effects of corncob and cottonseed meal on sawdust cultivation. All treatments of corncob except 100% corncob have produced fruiting-bodies. Mushroom productivity of the fungus was decreased from 174g to 45g per 2kg sawdust-based substrate in proportion to increasing corncob contents in sawdust cultivation. Meanwhile, in treatments including less than 20% cottonseed meal, the mycelial growth of the fungus was similar to control. But, the other treatments were not suitable for the mycelial growth of fungus on sawdust-based substrate. All treatments of cottonseed meal did not produce the fruiting-body of the fungus.