• 환경생물
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• 제39권4호
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• pp.581-589
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• 2021

본 연구는 메꽃과 6종의 식물에 대해 신속하고 비파괴적으로 분류하기 위해 근적외선(Vis-NIR) 스펙트럼을 이용하였고 데이터의 전처리와 머신러닝 기술을 적용하였다. 전국적으로 분포하는 메꽃과 6종에 대해 야외에서 휴대용 분광기를 이용하여 판별하였다. 식물의 잎의 표면에서 400~1,075 nm의 근적외선 스펙트럼(1.5 nm)을 수집하였다. 수집된 스펙트럼 데이터는 3가지의 전처리와 raw데이터를 이용하였고 4종류의 머신러닝 모델을 적용하여 높은 판별 정확도를 확인하였다. 전처리와 머신러닝 모델의 조합을 통해 분석된 판별의 정확도는 43~99%의 범위로 분석되었고, standard normal variate 전처리와 support vector machine 머신러닝 모델의 조합에서 판별 정확도가 98.6%로 가장 높게 나타났다. 본 연구에서 수집된 스펙트럼은 식물의 성장단계, 다양한 측정 지역 및 잎에서의 측정 위치 등과 같은 요인과 더불어 데이터 분석을 위한 조건으로 최적의 전처리와 머신러닝 기술을 적용한다면 메꽃과 식물의 야외에서의 정확한 분류가 가능하고 이들 식물의 효과적인 관리와 모니터링에 활용할 수 있을 것으로 판단되었다.

• 식물분류학회지
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• 제53권1호
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• pp.60-64
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• 2023

Ipomoea cristulata Hallier f. (Convolvulaceae), native to the desert regions of the central USA to Mexico, was newly found in Gojeong-ri, Deokgwa-myeon, Namwon-si, Jeollabuk-do. This species can be distinguished from I. coccinea by leaves with 3-5 lobes, hirsute distributed adaxially, and corolla entirely red or orange-red. Its Korean name is 'Nabi-ip-yu-hong-cho' based on its butterfly-shaped leaves. We provide a detailed description, photographs, habitat details, and a taxonomic key to related taxa.

• 식물분류학회지
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• 제50권3호
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• pp.351-355
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• 2020

Argyreia gyrobracteata Traiperm & Chitchak (Convolvulaceae) is newly recorded in Vietnam. It is similar to A. mekongensis Gagnep & Courch in having a white campanulate corolla but differs from that species by having whitish surface of the abaxial leaf, narrowly lanceolate or linear-oblong, curly, rolled up the bract with a longer length of the petiole and a shorter pedicel. It was previously known only in Thailand, but was recently found in Lam Dong Province, Vietnam, for the first time. The present study provides a detailed description, colorful photos and the distribution of the species. Furthermore, a comparison of the diagnostic characters between this species and a related species in Vietnam, A. mekongensis Gagnep & Courch, is provided.

• Natural Product Sciences
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• 제13권4호
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• pp.273-278
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• 2007

This paper presents a detailed pharmacognostical study of the stem and root of the crude drug Ipomoea quamoclit Linn. (Convolvulaceae). Morphoanatomy of the stem and root have been studied with the aim to aid pharmacognostic and taxonomic species identification using light and confocal microscopy, WHO recommended physico-chemical determinations and authentic phytochemical procedures. The physico-chemical, morphological and histological parameters presented in this paper may be proposed as parameters to establish the authenticity of stem and root of I. quamoclit and may possibly help to differentiate the drug from its other species.

• 생약학회지
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• 제13권2호
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• pp.62-69
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• 1982

Fiftythree species(35 families and 52 genera)of Korean medicinal plants which have been frequently used in oriental herb prescriptions or have been used as folklorics were evaluated on their short term acute toxicity and potential antitumor activities against P-388 murine lymphocytic leukemia model in vivo. Among these plants Acorus gramineus (Araceae), Agrimonia pilosa (Rosaceae), Aralia elata (Araliaceae), Dryopteris crassirhizoma (Aspidiaceae), Syringa reticulata (Oleaceae) and Calystegia japonica (Convolvulaceae) exhibited potent acute toxicity resulting from severe weight loss and death. Agrimonia pilosa (Rosaceae) showed about 33% of increased life span in comparison with that of control group mouse, but others exhibited no significant antitumor activities.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.368.3-369
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• 2002

Pharbitis nil Choisy (convolvulaceae) is an annual vine plant and grows at the wayside of Korea. Japan. China and India. The seeds of blue or red Pharbitis nil Choisy. Pharbitidis Semen, is black or red-brown. This seeds have been used as a purgative. From a preliminary experiment. Pharbitidis Semen exhibited anti-cancer activity. MeOH extract of this seeds was subsequently fractionated into four parts: methylene chloride, ethylacetate, n-butanol and water fractions. (omitted)

• Natural Product Sciences
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• 제6권3호
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• pp.135-138
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• 2000

MeOH extract of Cuscuta chinensis seeds was fractionated with n-hexane, EtOAc and BuOH successively, and antioxidant activities were tested for all fractions using DPPH free radical scavenging method. In the tested fractions, EtOAc fraction showed high antioxidant activity$(EC_{50},\;50\;{\mu}g)$ From the EtOAc fraction, five compounds have been isolated. On the basis of spectral data, these compounds were identified as ${\beta}-sitosterol$, methyl 4-hydroxy-3,5-dimethoxycinnamate, ${\beta}-sitosterol-3-O-{\beta}-D-glucopyranoside$, caffeic acid, quercetin, kaempferol and calycopteretin. Among these compounds, ${\beta}-sitosterol$ and ${\beta}-sitosterol-3-O-{\beta}-D-glucopyranoside$ showed no antioxidant activity. $EC_{50}$ values of methyl 4-hydroxy-3,5-dimethoxycinnamate, caffeic acid, quercetin, kaempferol and calycopteretin were 0.6, 8, 19, 17 and $12\;{\mu}g$, respectively.

• Journal of Plant Biology
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• 제35권2호
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• pp.173-182
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• 1992

The parasitic flowering plants obtain nutrients and water from their host plants through a parasitic organ, haustorium, which connects both structurally and physiologically host and parasite. The parasitism in angiosperms thus can be understood from the knowledge of the haustorial structure. The haustoria have evolve convergently and independently in several unrelated taxa; therefore, they have similar morphology. Many anatomical studies on the haustoria in several parasites in the pst have been carried out by light microscopy. Ultrastructural studies on the haustoria, which are started from the end of 1060s', have provided new information relating to the phenomenon of parasitism in angiosperms. The purpose of this paper is to introduce and compare the structure of haustoria between parasitic plants. The results may help an understanding of phylogenetic relationships of parasitic angiosperms. The haustoria of some families, such as Santalaceae, Orobancaceae, Scrophulariaceae, Loranthaceae (or Viscaceae), and Convolvulaceae (Cuscuta) will be discussed.

• Natural Product Sciences
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• 제5권3호
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• pp.124-126
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• 1999

A new natural product $stigmast-5-en-3-O-{\beta}-D-glucopyranoside$ tetraacetate (1) along with known compounds $stigmast-5-en-3-O-{\beta}-D-glucopyranoside$ (2), stigmast-5-en-3-yl-cetate (3) and ${\beta}-sitosterol$ (4) have been isolated from the stems of Cuscuta reflexa. Their structures were elucidated on the basis of chemical and spectroscopic evidence.

• 한국균학회지
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• 제50권1호
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• pp.55-59
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• 2022

Anamorph of a powdery mildew was collected from Convolvulus arvensis (Convolvulaceae) in 2021 in Korea. Based on the morphological examination and molecular phylogenetic analyses of the internal transcribed spacer and large subunit rDNA gene, the powdery mildew was identified as Erysiphe convolvuli. This powdery mildew species is commonly found in Europe and North America, but rarely in East Asia. The holomorph of this powdery mildew was first recorded on Calystegia hederacea in Korea. Conclusively, this is the first report of E. convolvuli on C. arvensis and the second record of this powdery mildew species in Korea.