• 한국산림과학회지
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• 제94권2호통권159호
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• pp.67-72
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• 2005

The objectives of this study were to identify the period of initiation of floral primordia in black locust (Robinia pseudoacacia L.) and subsequent development of floral buds until following spring. Four mature trees of black locust located in Suwon, Korea were selected. Bud samples were collected from the current-year shoots, starting from mid June to July every week, from August to October and from February to April every month. The buds were fixed in FAA solution, dehydrated, and imbedded in paraffin for microscopic observation. Buds collected on June 16, and 23, 1997, contained primitive primordia that might be interpreted as early floral primordia. By June 30, a bud showed a positive indication of inflorescence primordium with a well-formed shoot apex. All the inflorescence primordia observed throughout the collection periods were always associated with unique hairy appendages around the primordium and enclosed within a sclerenchymatous chamber. By July 7 and 15, a floral apex had early bud scales. By July 22, primitive inflorescence developed into visible arrangement of individual floral primordial By July 29, the inflorescence developed into whirl arrangement of individual floral primordia in a transverse section, but showed little further development until October 15. The inflorescence primordia seemed to over-winter at this stage. Buds collected from February 15 and March 24 the following year also showed no further development of inflorescence primordia. By April 7 the inflorescence started to show further development with elongated axis. At this time individual flowers were easily recognized.

• 생명과학회지
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• 제24권6호
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• pp.633-641
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• 2014

천연색소로 사용되는 식물류 11종(쪽, 아카시아, 코치닐, 아선약, 포도과피, 태수, 헤나, 국화, 붉은백단향, 대황, 서양꼭두서니)의 생리활성 규명을 위해 열수 추출 분말을 제조하여 항산화 및 항비만 활성을 비교 분석하였다. 총 페놀 함량은 아선약 추출물이 348.23 mg/g으로 가장 높았다. DPPH, ABTS 라디칼 소거능 및 FRAP법에 의한 환원력도 아선약 추출물의 활성이 가장 높았다. ${\beta}$-carotene linoleic acid system을 이용한 항산화 활성은 아카시아 추출물이 가장 높았다. 소화효소 저해 효과를 측정한 결과, ${\alpha}$-glucosidase 저해 활성은 아카시아 추출물이 93.93%로 가장 높았고, ${\alpha}$-amylase 저해 활성은 아선약 추출물이 64.53%로 가장 높았다. Trypsin 저해 활성은 아카시아 추출물이 60% 이상으로 가장 높았고, ${\alpha}$-chymotrypsin 저해 활성은 아선약 추출물이 40% 이상으로 가장 높았다. ipase 저해 활성은 아카시아 추출물이 52.73%로 가장 높았다. 3T3-L1 세포에 대한 지방 축적률은 아선약 추출물이 55.8%로 가장 낮아 지방세포 분화 억제 효과가 큰 것으로 나타났다. 결론적으로 식물류 색소원료의 중 아선약 추출물과 아카시아 추출물은 높은 항산화 활성을 나타내었으며, 탄수화물, 단백질 및 지방 분해효소 저해에도 상당한 효과를 가지는 것으로 나타났는데, 이러한 결과는 페놀 함량과 상관관계가 높은 것으로 판단된다. 특히 아선약 추출물의 경우 지방세포 분화 억제를 통해 항비만 활성을 나타내는 것으로 판단이 되며 그와 관련된 메커니즘 연구는 좀 더 진행되어야 할 것으로 사료된다.

• 한국자원식물학회지
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• 제36권1호
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• pp.91-99
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• 2023

기후변화 대응 바이오매스 생산이 우수한 활엽수 경제 조림수종 개발에 대한 수요가 증가하고 있다. 아까시나무는 탄소흡수능이 우수한 속성수로서 국내 적응성이 뛰어나고 경제적, 환경적 기능이 우수하다. 본 연구는 비교선발법을 이용하여 용재수로서 가치가 높은 아까시나무 우량개체 64본을 선발하였다. 경기, 강원, 충청, 경상 등 4개 지역으로 나누어서 생장특성을 비교한 결과 선발목들은 비교목들에 비해 수고, 흉고직경, 지하고, 통직성에서 유의적으로 우수한 형질을 보였다. 특히 충청지역의 선발목들이 가장 우수한 생장특성을 나타냈으며, 임분별로는 고성, 천안, 안동 집단이 우량집단으로 나타났다. 생장에 영향을 주는 요인 중에서 토양 성분은 상관관계가 없었으며, 대단위 산림 조림 지역 혹은 호수와 저수지가 인접한 지역의 선발목이 수고 생장이 우수한 것으로 나타났다.

• 한국산림과학회지
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• 제112권1호
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• pp.11-22
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• 2023

본 연구는 경북 일대 산지 아까시나무림의 자연성 회복을 위한 생태적 관리에 필요한 기초정보 제공을 위하여 총200개 임분에서 수집된 식생자료를 바탕으로 이원지표종분석법(TWINSPAN)으로 식생유형을 분류하고, DCA 분석으로 환경구배에 따른 그 공간배열 상태를 파악함과 아울러 식생유형별 군락적합도(Φ) 판정으로 결정된 진단종을 기준으로 군락조성요약표를 작성하였다. 식생유형은 신갈나무-둥굴레형, 밤나무-청미래덩굴형, 철쭉-인동덩굴형, 찔레꽃-쑥형, 감태나무-댕댕이덩굴형, 참느릅나무-팽나무형, 그리고 귀룽나무-푼지나무형 등 모두 7개 유형으로 분류되었으며, 대개 해발고도, 수분 체계, 천이 단계 및 교란 체제 등 복합적 요인의 차이를 반영하고 있었다. 구성종의 평균상대중요치는 아까시나무(39.7)가 단연 높게 나타났지만, 굴참나무, 졸참나무, 신갈나무, 상수리나무, 갈참나무 등 참나무류가 상위중요치 구성종으로 나타나고 있어 잠재천이경향을 가늠할 수 있었다. 또한, 식생유형별 구성종의 총피도, 생활형 조성, 종다양성 지수, 그리고 지표종 등도 비교하였다.

• 한국산림과학회지
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• 제26권1호
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• pp.43-47
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• 1975

이것은 서울, 광릉(光陵), 전주(全州), 경주지방(慶州地方)에서 솔잎혹파리성충(成虫)의 우화시기(羽化時期)와 이의 표현표식(表現標識)으로 아까시나무의 개화시기(開花時期)를 조사(調査)한 것이다. 1. 솔잎혹파리성충(成虫)의 우화(羽化)는 그 지방(地方)의 아까시나무꽃의 개화(開花)가 시작되는 시기(時期)에 시작된다. 2. 솔잎혹파리성충(成虫)의 우화(羽化)는 그 지방(地方)의 아까시나무꽃의 만개(滿開)하는 시기(時期)에 그 최성기(最盛期)에 드러가며 주락기(淍落期)까지 계속(繼續)된다. 3. 솔잎혹파리성충(成虫)의 우화최성기(羽化最盛期)에 꽃이 만개(滿開)하는 식물(植物)은 아까시나무이외(以外)에 백당나무, 찔레나무, 꽃창포 등(等)이 있다.

• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.21-26
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• 2001

Acquisition of precise information on drying characteristics of wood is indispensable for the improvement of drying schedules and wood quality. Recognition of the exact moisture content at which drying defects such as checks occur during drying with given drying conditions may be essential to reduce drying losses. In this study an image-processing system was combined with a laboratory-scale wood dry kiln for experiments and the surface of tree disk of black locust (Robinia pseudoacacia L.) was monitored to investigate the behavior of check formation over all the drying process. This system showed good potential for improving drying schedules and wood product quality.

• Journal of the Korean Wood Science and Technology
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• 제26권4호
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• pp.34-42
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• 1998

Three hardwood (ash, alder and black locust) and three softwood (Japanese red pine, radiata pine and Western hemlock) specimens were dried in microwave(MlW) oven and their drying rates were obtained. Their specific permeabilities were also measured by using a modified liquid permeability measuring device. The correlation between the M/W drying rates and permeabilities of six species were statistically analyzed. It was revealed that within a species there is a logarithmic relationship between the M/W drying rates and average moisture contents and that among species there is a linear relationship between the M/W maximum drying rates and the average specific permeabilities. A exception was Western hemlock, which was of low permeability and of high drying rate. A Me-time equation, which showed a good agreement with the actual data, was derived. Thus using this equation the moisture contents of wood and the drying end points of M/W drying could be predicted. Infrared images of the thermal distribution in wood were illustrated.

• 한국대기환경학회지
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• 제23권1호
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• pp.29-38
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• 2007

Recently, the tropospheric ozone has gained a global attention for its adverse effect on vegetation as well as its contribution to the global warming. Although a number of studies have been carried out for the urban ozone, the effect of ozone on vegetation is still largely unknown in Korea. The present work aimed at performing the first evaluation of forest damage by ozone using the national air monitoring data from the year 2000 to the year 2005. Moreover, it also explored the relevance of adverse effect of ozone to the recent events on leaf chlorosis of black locust, Robinia pseudo-acacia, leading to early foliage widely observed in Korea since 2001. In the nineties, forest damages caused by ozone such as leaf chlorosis occurred in Europe and North America and led to invoke comprehensive field and laboratory studies. As a result, AOT40, implying the accumulated dose over a threshold 40 ppb, was developed to assess the forest damage by ozone. 19 air monitoring stations were selected across Korea to calculate AOT40 from the year 2000 to the year 2005. The calculated AOT40 generally increased during April and May and reached the maximum after May. The increase of AOT40 diminished substantially from the mid-June as the rainy season started. The calculated AOT40 in the nine rural sites from the year 2002 to th ε year 2005 ranged from 6.8 to 29.4 ppm-hr. And all the AOT40 at th ε year 2005 exceeded the critical value of 10 ppm-hr for forest damage. Morevoer the calculated AOT40 of Korea appeared higher than the AOT40 of Europe in the year 2004/2005 and comparable to the AOT40 of China in the year 2000. Despite the high levels of the calculated AOT40 since the year 2001 and the consistency of time of seasons between high AOT40 values and occurrence of chlorosis of black locust, further studies are required to conclude that the chlorosis of black locust occurred from the year 2001 to the year 2005 were resulted from a damage by ozone.

• 한국산림과학회지
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• 제84권2호
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• pp.145-150
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• 1995

기내배양된 아까시나무(Robinia pseudoacacia L.)의 줄기기부에서 발생된 callus로부터 기관발생을 통하여 식물체재분화 시스템을 확립하였다. Callus는 줄기를 BA 또는 NAA가 함유된 MS배지에 배양하였을 때 유도되었으며, BA처리구가 NAA처리구보다 유도율이 높았다. BA가 첨가된 배지에 줄기를 배양하였을 때 기부 callus의 생장은 광조건 및 암조건에서도 잘 증식되었다. 줄기기부에서 발생된 callus는 녹색과 희면서 노란색을 띠는 callus로 분리되어 2.0mg/l BA와 0.5mg/l NAA가 함유된 mMS배지에 배양하였을 때 녹색의 callus로부터 줄기가 재분화되었다. 재분화된 줄기는 생장조절제가 함유되지 않은 ${\frac{1}{2}}MS$배지에서 발근되었다.

• The Plant Pathology Journal
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• 제22권2호
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• pp.125-130
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• 2006

An isolate of Peanut stunt virus (PSV) isolated from black locust tree (Robinia pseudo-acacia L.) showing severe mosaic and malformation symptoms, was designated as PSV-Rp. PSV-Rp was characterized by the tests of host range, physical properties, RNA and coat protein composition and RT-PCR analysis. Nucleotide sequences of the cucumoviruses CP genes were also used for identification and differentiation of PSV-Rp. Six plant species were used in the host range test of PSV-Rp. PSV-Rp could be differentiated from each Cucumovirus strain used as a control by symptoms of the plants. The physical properties of PSV-Rp virus were TIP $65^{\circ}C$, DEP $10^{-3}$, and LIP $2{\sim}3$ days. In dsRNA analysis, PSV-Rp consisted of four dsRNAs, but satellite RNA was not detected. Analysis of the coat proteins by SDS-PAGE showed one major protein band of about 31 kDa. RT-PCR using a part of Cucumovirus RNA3 specific primer amplified ${\sim}950bp$ DNA fragments from the crude sap of virus-infected black locust leaves. RFLP analysis of the RT-PCR product could differential PSV-RP from CMV The nucleotide sequence identity between the PSV-Rp CP and the TAV-P CP genes and the PS-V-RP CP and CMV-Y CP genes were 61.6% and 40.5%, respectively. On the other hand, the nucleotide sequence identity of the PSV-Rp CP gene was $70.9%{\sim}73.4%$ in comparison with those of PSV subgroup I (PSV-ER and PSV-J) and 67.3% with that of PSV subgroup II(PSV-W). Especially, the nucleotide sequence identity of PSV-Rp CP gene and that of PSV-Mi that was proposed recently as the type member of a novel PSV subgroup III was 92.4%.