• Journal of Plant Biology
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• v.27 no.2
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• pp.81-94
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• 1984

Anatomical features and cell dimensions of the secondary xylem in the stem of the korean Lauraceas including 6 genera and 12 species were investigated under a light microscope and scanning electron microscope. Key to identification among genera or species was made from the anatomical features and systematic correlation investigated. The stem woods of Lauraceae exhibit the following characters: (1) quite evenly distributed pores (diffuse-porous wood) (2) perforation plates simple or occasionally scalariform in the latewood vessels (3) almostly 2-seriate and heterocellular rays (4) abundant paratracheal-vasicentric parenchyma (5) oil cells. Especially, the appearance of simple perforation plates suggest the Lauraceae to be more or less advanced. It is considered that the series of specialization in the Lauraceae from the perforation plates and the height of rays is as LinderalongrightarrowNeolitsealongrightarrow(Machilus, Litsea, Iozoste)longrightarrowCinnamomum, and Lindera sericea is the most pribitive in the Lauraceae.

• YAKHAK HOEJI
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• v.35 no.2
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• pp.142-145
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• 1991

Two flavonoids have been isolated from the leaves of Machilus thunbergii Sieb. et Zucc. (Lauraceae) and identified as hyperin and isoquercitrin.

• Journal of the Korean Wood Science and Technology
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• v.50 no.6
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• pp.414-426
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• 2022

The Lauraceae family has commercial uses, such as in the food, pharmaceutical, and perfume industries. This study was conducted to investigate anti-asthmatic activity of essential oils from the seven species in the Lauraceae family. The essential oils were extracted from the leaves of seven species, and the chemical composition was investigated by gas chromatography-mass spectrometry. The major constituents of essential oils differed depending on the species, even if they belonged to the same family. The main constituents were camphor (89.09%) in Cinnamomum camphora, linalool (26.91%) in Cinnamomum cassia, 1,8-cineole (23.90%) in Cinnamomum japonicum, d-limonene (10.27%) and β-eudesmol (10.03%) in Lindera obtusiloba, δ-cadinene (13.85%) and α-phellandrene (11.57%) in Machilus japonica, cis-,trans-β-ocimene (13.80% and 12.06%) and elemol (11.46%) in Neolitsea aciculata, and cis-β-ocimene (37.94%) and sabinene (24.91%) in Neolitsea sericea. The anti-asthmatic activity of essential oils was investigated using the lipopolysaccharide-induced NCI-H292 cells. The relative expression levels of the pro-inflammatory cytokines [interleukin (IL)-1β and IL-6] and mucus gene (MUC5AC and MUC5B) were significantly reduced by essential oils from seven species in the Lauraceae family. Among the seven essential oils, the essential oil from L. obtusiloba had the most superior anti-asthmatic activity. These results suggest that the essential oil of L. obtusiloba leaves could be used as an agent to suppress mucus hypersecretion.

• Korean Journal of Pharmacognosy
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• v.25 no.2
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• pp.188-193
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• 1994

'Hoo Bak' is one of the Chinese crude drugs used mainly to cure a headache, apoplexy and dyspepsia. With regard to the botanical origin of 'Hoo Bak', it has been considered to be Machilus thunbergii of Lauraceae in Korea. But there has no pharmacognostical confirmation on it. To clarify the botanical origin of 'Hoo Bak', the anatomical characteristics of the bark of Machilus thunbergii, Magnolia officinalis and Magnolia obovata were studied. As a result, it was clarified that 'Hoo Bak' from Korea was the bark of Machilus thunbergii of Lauraceae.

• Plant Resources
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• v.1 no.2
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• pp.121-125
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• 1998

Wood and bark structure of Laurus, which is considered as an important spice resources was characterized by several transitional and advanced features. Annual rings are distinct: vessel elements are moderately short and narrow, both simple and sealariform perforation plates. alternate intervascular pitting; irregularly septate fiber are present; parenchyma strands are scanty paratracheal: rays are both homogeneous and heterogeneous with multiseriate: phloem rays are dilated. Comparisons with other genera of Lauraceae suggest that Laurus is transitional and advanced state in evolutionary trends in the family.

• Korean Journal of Pharmacognosy
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• v.21 no.3
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• pp.197-200
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• 1990

Quercetin, trifolin and quercitrin were isolated from the leaves of Machilus thunbergii Sieb. et Zucc. (Lauraceae) and characterized by spectral data. These are reported for the first time from this plant.

• Korean Journal of Pharmacognosy
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• v.21 no.1
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• pp.60-63
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• 1990

From the leaves of Machilus thunbergii Sieb. et Zucc. (Lauraceae) afzelin, guaiyaverin and rutin were isolated and identified by chemical and spectral analysis.

• Journal of Korean Society of Forest Science
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• v.72 no.1
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• pp.9-15
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• 1986

The taxonomy of the broad-leaf evergreen trees (4 genera, 5 species) of Lauraceae was studied by the morphological characteristics of stipules. The results obtained were summarized as follows; 1) The stipules of Lauraceae were arranged alternately with 5-31 stipules of simple leaf. The venations or stipules were basal reticulate and pinnated vein. The shapes of stipule blade were oblong, oblanceolate, rhomboid and oval. The stipule apex was acuminate and obtuse, the stipule base was attenuate, and the stipule margin was entire margin. The trichomes of stipules were sericeous, tomentose and villous. The five species of Lauraceae could be identified by the morphological characteristics of stipules. 2) The morphologically changing forms of stipule vein were classified into three groups; A form - the form of pinnate vein with the distinguished main vein (lozoste lancifolia), B form - the three vein grows into the form of basal reticulate vein (Neolitsea sericea, Cinnamomum japonicum and C. camphora), C form - the parallel vein grows into the form of basal reticulate vein (Marhilus thunbergii). 3) The changing forms of stipule's width from stipule "a" to "j" were three forms; (1) a>d>g>j form: C. japonicum, C. camphora and I. lancifolia, (2) a>cj,(aj,(a

• Korean Journal of Environment and Ecology
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• v.34 no.6
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• pp.503-514
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• 2020

Climate change leads to changes in phenological response and movement of plant habitats. Korea's evergreen broad-leaved forest has widened its distribution area compared for the past 20 years, and the range of its native habitats is moving northward. We analyzed climate indices such as the warmth index, the cold index, the lowest temperature in the coldest month, and the annual average temperature, which are closely related to vegetation distribution, to predict the change in the native habitat of Lauraceae evergreen broad-leaved trees. We also analyzed the change and spatial distribution to identify the habitat climate characteristics of 8 species of Lauraceae evergreen broad-leaved trees distributed in the warm temperate zone in Korea. Moreover, we predicted the natural habitat change in the 21st century according to the climate change scenario (RCP 4.5/8.5), applying the MaxEnt species distribution model. The monthly average climate index of the 8 species of Lauraceae evergreen broad-leaved trees was 116.9±10.8℃ for the temperate index, the cold index 3.9±3.8℃, 1495.7±455.4mm for the annual precipitation, 11.7±3.5 for the humidity index, 14.4±1.1℃ for the annual average temperature, and 1.0±2.1℃ for the lowest temperature of winter. Based on the climate change scenario RCP 4.5, the distribution of the Lauraceae evergreen broad-leaved trees was analyzed to expand to islands of Jeollanam-do and Gyeongsangnam-do, adjacent areas of the west and south coasts, and Goseong, Gangwon-do on the east coast. In the case of the distribution based on the climate change scenario RCP 8.5, it was analyzed that the distribution would expand to all of Jeollanam-do and Gyeongsangnam-do, and most regions except for some parts of Jeollabuk-do, Chungcheongnam-do, Gyeongsangbuk-do, and the capital region. For the conservation of Lauraceae evergreen broad-leaved trees to prepare for climate change, it is necessary to establish standards for conservation plans such as in-situ and ex-situ conservation and analyze various physical and chemical characteristics of native habitats. Moreover, it is necessary to preemptively detect changes such as distribution, migration, and decline of Lauraceae evergreen broad-leaved trees following climate change based on phenological response data based on climate indicators and establish conservation management plans.

• Archives of Pharmacal Research
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• v.22 no.4
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• pp.417-422
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• 1999

Two new furanolignans (3, 5), together with three known lignans (1, 2, 4,), were isolated from the stem of Lindera obtusiloba (Lauraceae). The structures of the compounds were determined as actifolin (1), pluviatilol (2), 5,6-dihydroxymatairesinol (3), (+)-syringaresinol (4), and $(+)-9^{l}$-O-trans-feruloyl-5,51-dimethoxylariciresinol (5) on the basis of physicochemical and spectroscopic evidences. Compounds 1, 2, 3, and 5 showed cytotoxicity against a small panel of human tumor cell lines with values of $3.40{\sim}19.27 {\mu}g/ml$.