“”에 대한
게시판
결과는 총 13,048건 입니다.
게시판 (13,048)
-
Notes on Sparganium coreanum(Typhaceae) rediscovered on the Korean Peninsula
2020-05-26
Abstract Sparganium coreanum , a barely recognized species in Korea, was rediscovered during a field survey by the authors, who conducted a re-examination of specimens deposited in the Herbarium of the Korea National Arboretum (KH). This species was described initially by H. Léveillé from a specimen collected by F. Taquet from Jeju-do (Taquet 2150). Subsequently, however, it was overlooked and unrecognized among South Korean flora. Several populations of S. coreanum were found in the southern part of the Korean Peninsula and on Jeju-do, although it has long been recognized as S. erectum owing to certain vegetative morphological characteristics shared between the two species, such as robust stems, a similar plant height, and globose rhizomes. However, it is distinct from S. erectum by the number of female heads on the lowest inflorescence branch and the size and shape of the fruit. In this study, we provide a detailed description, illustrations, and photographs with a revised taxonomic key for identification of Sparganium species in Korea.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
Characterization of β-Glycosidase from Caldicellulosiruptor owensensis
2020-05-26
ABSTRACT Platycodin D has diverse pharmacological activities. An efficient and economical mechanism for obtaining platycosides (platycodin D in particular) would be very useful. Balloon flower leaf extract (BFLE) was obtained by recycling leaves discarded from Platycodi radix production, as they have a high platycoside E content. A recombinant β-glycosidase from Caldicellulosiruptor owensensis was characterized and applied to BFLE for platycoside bioconversion. The enzyme specifically hydrolyzed the glucose residue at the C-3 position in platycosides and was suitable for platycodin D production. Under optimized reaction conditions, β-glycosidase from C. owensensis completely converted platycoside E from BFLE into platycodin D with the highest concentration and productivity reported so far. These results greatly improve the production process for deglycosylated platycosides.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
Pollen morphology of Persicaria section Cephalophilon (Polygonaceae)
2021-05-12
ABSTRACT Pollen morphology of 19 taxa in Persicaria section Cephalophilon and four related taxa in the genus Koenigia was examined.Pollen grains shed as a monad were oblate to subprolate in shape (P/E = 0.50–1.20), small to large in size (13.44–51.16 μm), and tricolpate, octocolpate, or pantoporate. Three types of exine ornamentation were identified: (I) reticulate (P. sect. Cephalophilon), (II) reticulate with microechinae (Koenigia delicatula), and (III) microechinate (studied taxa of Koenigia except K. delicatula). The quantitative pollen characteristics analyzed using principal component analysis showed diag‑ nostic importance among the taxa. The comprehensive consideration of pollen characteristics (aperture type, pollen size, and detailed exine ornamentation) is systematically informative, particularly at the series level of P. sect. Cephalophilon. Furthermore, the results also support the separation of some taxa of uncertain taxonomic affinities between Koenigia and P. sect. Cephalophilon. Orbicules were absent in all taxa of P. sect. Cephalophilon but were consistently found in Koenigia. The examined orbicules were spherical with a psilate surface, and the studied orbicule characteristics provided additional evidence to clarify the taxonomic position of some taxa of Koenigia. The orbicule and pollen morphology, especially aper‑ ture types, has proven to be a useful diagnostic characteristic in P. sect. Cephalophilon and related taxa, and their systematic importance is further discussed in this study.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
식물 이름과 관리법이 궁금합니다!
2025-05-19
1. 식물 상담 분류를 오른쪽 괄호 안에 기입해 주세요 . (1, 3 e : ③ 1식물ㅇ ① 식물 이름 ②식물 병해충 ③ 식물 관리법 ④ 기타 2. 식물의 분류를 오른쪽 괄호 안에 기입해 주세요. ( 2 ex : ② ① 초본 ②목본 3. 키우는 장소를 오른쪽 괄호 안에 기입해 주세요. ( 2 ex : ③ 실외 ) ① 베란다 ②실내 ③ 실외 4. 물주는 시기를 오른쪽괄호 안에 기입해 주세요 . ( 3 ex : ③ 1회/주 ) ① 1회/일 ② 2회/일 ③ 1회/주 ④ 기타 5. 물주는 방법을 오른쪽 괄호 안에 기입해 주세요. ( 1ex : ②흙겉만 젖게 ) ① 흙이 충분히 젖도록 ②흙겉만 젖게 6. 식물의 증상(부위 작성)을 작성해 주세요. →11
HOME > 마이페이지 > 활동내역 > 반려식물 Q&A 제출내역
-
Heat unit model for classifying the environmentally controlled period during ecodormancy
2020-05-26
ABSTRACT Ecodormancy is a state in which the growth of a tree is inhibited by external environmental conditions. In this study, the concept of temperature range-based growth inhibition during the ecodormancy period was applied to estimate the heat requirements of the Niitaka oriental pear. Hourly temperature and flowering data from 12 regions of South Korea from 1999 to 2014 were analyzed, and the results were validated by flowering data from 2015–2017. Temperature ranges equal to 7 °C or higher had a heat accumulation effect that advanced flowering, whereas temperatures below 6.0 °C delayed flowering and negated the heat accumulation effect. In particular, 1 h at −2.0 to 6.0 °C and below −2.0 °C negated the heat accumulation effects of 1 and 8 h at temperatures of 7.0 °C or higher, respectively. Due to these negating effects, a 'limited heat accumulation period' occurred that maintained the heat accumulation values at 0. Furthermore, this period was consistent with the basic concept of ecodormancy because it indicated that the heat effect required for bud burst and flowering could not be achieved under low-temperature environmental conditions. The 'limited heat accumulation period' exempted the heat requirements from being confounded by errors in the estimation of the ecodormancy starting point, even though this point varied by up to 19 days depending on the chilling requirement model. The developed model was validated in terms of the consistency of the heat requirements and the accuracy of the flowering prediction. The heat requirement of Niitaka pear from 1999 to 2014 was 334.0 heat units (Hus), and the values were similar in 2015, 2016 and 2017 when this was not inputted into the model. The developed model presented errors of 2.5–2.8 days between the actual and estimated flowering dates.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
RE: 유칼립투스 관리 ㅡ잎이 자꾸 노랗게 변합니다ㅡ실내
2025-05-28
HOME > 마이페이지 > 활동내역 > 반려식물 Q&A 제출내역
-
천축산 일대 금강소나무림의 군집구조 및 종조성
2021-05-11
This study was conducted to analyze community structure and species composition of Pinus densiflora for. erecta Stand in Mt. Cheonchuk (653 m). Field survey was carried out from June to September in 2013. 74 plots (20×20 m) were set up, 5 herb layer plots (3×3 m) were constructed for each plot, and there, Diameter at Breast Heigh t(DBH), height, environmental factor, annual growth were measured. Vascular plants were surveyed as following; 66 family, 165 genus, 211 species, 2 sub species, 29 variety, 6 form 248 taxa. Results of cluster analysis for P. densiflora for. erecta forest, 3 communities were divided into; Quercus mongolica (P-1), Quercus variabilis (P-2) and Quercus aliena-Stephanandra incisa (P-3). There were significant environmental factors that organic layer, annual growth, CEC, total total nitrogen, organic matter and pH for each community. As a result of DCA, P-1 and P-2 were distributed large range of environmental factors but relatively limited in P-3. Distributions of herb layer were affected by sand, cation exchange capacity, silt and total nitrogen. Results of MRPP test for herb layer communities, it was significantly analyzed (A=0.003, P https://doi.org/10.7732/kjpr.2020.33.1.1
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
천축산 일대 금강소나무림의 군집구조 및 종조성
2021-05-11
Abstract This study was conducted to analyze community structure and species composition of Pinus densiflora for. erecta Stand in Mt. Cheonchuk (653 m). Field survey was carried out from June to September in 2013. 74 plots (20×20 m) were set up, 5 herb layer plots (3×3 m) were constructed for each plot, and there, Diameter at Breast Heigh t(DBH), height, environmental factor, annual growth were measured. Vascular plants were surveyed as following; 66 family, 165 genus, 211 species, 2 sub species, 29 variety, 6 form 248 taxa. Results of cluster analysis for P. densiflora for. erecta forest, 3 communities were divided into; Quercus mongolica (P-1), Quercus variabilis (P-2) and Quercus aliena-Stephanandra incisa (P-3). There were significant environmental factors that organic layer, annual growth, CEC, total total nitrogen, organic matter and pH for each community. As a result of DCA, P-1 and P-2 were distributed large range of environmental factors but relatively limited in P-3. Distributions of herb layer were affected by sand, cation exchange capacity, silt and total nitrogen. Results of MRPP test for herb layer communities, it was significantly analyzed (A=0.003, P
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
Development of a model to estimate the chilling requirement of oriental pear by standardizing
2020-05-26
ABSTRACT The objective of this study was to develop a model to estimate the chilling requirements of 10 oriental pear cultivars by standardizing dormancy depth. The dormancy depth of these cultivars was standardized to a range of 0–100 by setting the lowest bud burst rate during endodormancy as 0 and the bud burst rate immediately after the completion of endodormancy as 100. The endodormancy period was divided into periods. Stage I represented continuously increasing dormancy depth until the deepest dormancy was reached. Stage II represented the period of decreasing dormancy depth following the deepest dormancy; this stage included the breaking of dormancy. In addition, the 10 studied cultivars were classified into three types according to their dormancy depth changing pattern: stage I drop type, stage II leap-up type, and stage I·II symmetric type. A chilling accumulation model was derived based on both the endodormancy period and the dormancy depth of each cultivar. The results showed that − 1.9 to 12.0 °C was an effective range for chilling accumulation and that 2.1–4.0 °C was the most effective range for chilling accumulation. The results also revealed that negative accumulation, the reverse reaction of chilling accumulation, occurred under high-temperature conditions (above 14 °C). The results of the model verification process ed that the high-temperature conditions (above 14 °C) exhibited negative accumulation values due to an inverse relationship with dormancy depth during endodormancy stage I and that the chilling accumulation for the actual dormancy break mostly occurred during endodormancy stage II.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
-
Conversion of Glycosylated Platycoside E to Deapiose-Xylosylated Platycodin D by Cytolase PCL5
2020-05-26
Abstract Platycosides, the saponins abundant in Platycodi radix (the root of Platycodon grandiflorum), have diverse pharmacological activities and have been used as food supplements. Since deglycosylated saponins exhibit higher biological activity than glycosylated saponins, efforts are on to enzymatically convert glycosylated platycosides to deglycosylated platycosides; however, the lack of diversity and specificities of these enzymes has limited the kinds of platycosides that can be deglycosylated. In the present study, we examined the enzymatic conversion of platycosides and showed that Cytolase PCL5 completely converted platycoside E and polygalacin D3 into deapiose-xylosylated platycodin D and deapiose-xylosylated polygalacin D, respectively, which were identified by LC-MS analysis. The platycoside substrates were hydrolyzed through the following novel hydrolytic pathways: platycoside E → platycodin D3 → platycodin D → deapiosylated platycodin D → deapiose-xylosylated platycodin D; and polygalacin D3 → polygalacin D → deapiosylated polygalacin D → deapiose-xylosylated polygalacin D. Our results show that cytolast PCL5 may have a potential role in the development of biologically active platycosides that may be used for their diverse pharmacological activities.
HOME > 주요사업 > 산림생물 보전·활용 증진 > 기술개발 성과 > 학술논문
이 누리집은 산림청 산하 공공기관 누리집입니다.
