As a class of small non-coding RNAs, microRNA (miRNA) is widely present and plays important regulatory roles in plant growth, development and stress response. Based on the mechanism of miRNAs in plants, we review the identification of miRNAs in some genera of Orchidaceae, the specific functions of several miRNAs and other relevant studies on miRNAs in the last decade, in order to provide a reference for better understanding function and regulatory network of small RNAs in orchids.
MicroRNAs/genetics* ; Orchidaceae/genetics* ; Plants/genetics*

Three different origins of Anoectochilus roburghii were used as experimental materials to study the effect of three different substrate( peat soil-river sand-peanut shell) radio on survival rate,plant height,stem diameter,plant fresh weight,root number,the longest root length,root diameter,and the contents of polysaccharide,flavonoids,and polyphenol. The results showed that when the substrate ratio was 4 ∶2 ∶2,the survival rate of A. roburghii from different origins was the highest,and the plant height,stem diameter,plant fresh weight,the longest root length and root diameter were also the largest. The cultivation substrate had no significant effect on the polysaccharide content of A. roxburghii and A. formosanus. When the substrate ratio was 4 ∶ 2 ∶ 2,the polysaccharide content of A.chapaensis was significantly lower than that of the other two combinations. When the substrate ratio was 4 ∶2 ∶1,the flavonoid content of A. formosanus was higher than that of the other two combinations. When the substrate ratio was 4 ∶2 ∶2,A. formosanus and A. chapaensis had higher polyphenol content.
Flavonoids ; analysis ; Orchidaceae ; chemistry ; growth & development ; Polyphenols ; analysis ; Polysaccharides ; analysis

Fourteen compoumds were isolated from the ethyl acetate portion of the 95% ethanolic extract of Pleione bulbocodioides by a combination of various chromatographic techniques including silica gel, ODS, macroporous adsorbent resin, Sephadex LH-20, and preparative HPLC, of which ten compoumds were phenanthrenes and dihydrophenanthrenes, two compoumds were bibenzyls, one was lignan and a sterol. Their structures were identified on the basis of spectroscopic data as monbarbatain A(1), 2, 7, 2'-trihy-droxy-4, 4', 7'-trimethoxy-1, 1'- biphenanthrene(2), blestriarene A(3), pleionesin B(4), shanciol H(5), 17-hydroxy-7'-(4'-hy-droxy-3 '-methoxyphenyl)- 4-methoxy-9, 10, 7', 8'-tetrahydrophenanthro[2, 3-b]furan-8'-yl methyl acetate(6), 1-p-hydroxybenzyl-4-methoxy phenanthrene-2, 7-diol(7), 1-p-hydroxybenzyl-4-met-hoxy-9, 10-dihydrophenanthrene-2, 7-diol(8), hircinol(9), coelonin( 10), gigantol(11), batatasin 11 (12), syringaresinol(13) and ergosta4, 6, 8 ( 14) , 22-tetraen-3-one (14). Compounds 1-3, 9, 13 and 14 were isolated from this genus for the first time.
Drugs, Chinese Herbal ; chemistry ; Orchidaceae ; chemistry ; Organic Chemicals ; analysis

To establish an HPLC method for determination of dactylorhin A and militarine in Cremastrae Pseudobulbus/Pleiones Pseudobulbus. The analysis was achieved on an Alltech Prevail C18 column (4. 6 mm x 250 mm, 5 microm) using a mobile phase of acetonitrile (A), water (B) gradient elution in a total run time of 35 min (0 min, 20:80; 30 min, 55:45; 35 min, 55:45) and a diode array detector was set at 224 nm. The flow rate was 0.8 mL x min(-1). The assay displayed good linearity over the concentration range of 0.257-9.95 microg (r = 0.999 8), and 0.128-10.27 microg (r = 0.999 9), respectively. The average recoveries (n = 9) were 94.70% and 102.8% for dactylorhin A and militarine, respectively. The method is accurate, quick, simple and reproducibility. It can be used for the quality control of Pleione bulbocodioides and Pleione yunnanensis.
Chromatography, High Pressure Liquid ; Glucosides ; analysis ; Orchidaceae ; chemistry ; Succinates ; analysis

The plants of Bletilla are one of the groups in Orchidaceae with the highest economic value. As the traditional Chinese medicinal material, Bletillae Rhizoma exhibits excellent efficacy in hemostatic, antibiosis, detumescent, anticancer activities and regenerating tissue to heal wound, which has great development potential. However, Bletillae Rhizoma is mainly collected from wild resources. At present, the quantity of wild resources of Bletilla plants has sharply decreased and is far from meeting the needs. Resource appraisal and breeding and cultivation of excellent germplasms of Bletilla plants are important for scientific utilization of the resources of the genus. This paper reviewed the following researches of Chinese Bletilla resources: species and distribution, genetic diversity, active ingredient evaluation, breeding, as well as seeding production and cultivation techniques. Suggestions were also provided in further researches on the resources evaluation, sustainable development and efficient utilization of Chinese Bletilla plants.
Drugs, Chinese Herbal ; Hemostatics ; Orchidaceae ; Plant Breeding ; Plants, Medicinal ; Rhizome

As the main active ingredient of the orchidaceous herb Bletilla striata, B. striata polysaccharide(BSP) has pharmacological activities such as promoting coagulation, anti-inflammation, anti-oxidation, promoting wound healing, anti-tumor, and immunomodulation, and is biodegradable and non-toxic. Additionally, it has the material properties of suspension thickening, film-forming adhesion, coating and solubilizing, targeting and slow releasing, effect-enhancing and toxicity-reducing, etc., playing the role of unification of medicines and excipients. Therefore, BSP has a wide application prospect in the fields of drug delivery system and trauma repair. This paper reviews the research progress of BSP application in new drug delivery systems and biomaterials based on the related li-terature in recent years, with the aim of providing reference for the further research and application of BSP.
Biocompatible Materials ; Drug Delivery Systems ; Orchidaceae ; Polysaccharides ; Wound Healing

Traditional Chinese medicine is planted in mountainous areas with suitable natural conditions. The planting area is complex in terrain,and the planting plots are mostly irregularly shaped. It is difficult to accurately calculate the planting area by traditional survey methods. The method of extracting Chinese herbal medicine planting area combined with remote sensing and GIS technology is of great significance for the rational development and utilization of traditional Chinese medicine resources. Taking Bletilla striata planting in Ningshan county of Shaanxi province as an example,the extraction method of planting area of traditional Chinese medicine in county was studied. High-resolution ZY-3 and GF-1 multi-spectral multi-temporal remote sensing images were used as data sources. Through field sampling,samples such as B. striata,cultivated land,forest land,water body,artificial surface,alpine meadow,etc. are collected. The spectral features,texture features and shape features of remotely identifiable objects in different planting areas and cultivated land,vegetable sheds were analyzed,confusing ground objects were eliminated and interpretation marks were establish. The method of visual interpretation is used to realize the extraction of B. striata planting areas,and the B. striata planting area are calculated by combining GIS technology. The results showed that the method of visual interpretation,using high-resolution ZY-3 and GF-1 multi-spectral multi-temporal remote sensing image data extracted the planting area of 403.05 mu. It can effectively extract the B. striata planting area in research region.
Forests ; Medicine, Chinese Traditional ; Orchidaceae ; Remote Sensing Technology

OBJECTIVETo study the chemical constituents of the corm of the planted Cremastra appendiculata.

METHODThe compounds were isolated by column chromatography with silica gel and Sephadex LH-20, and their structures were elucidated by means of spectroscopic methods including 2D NMR techniques.

RESULTSix compounds were isolated, and identified as isohircinol (I), flavanthrinin (II), p-hydroxyphenylethyl alcohol (III), 3,4-dihydroxyphenylethyl alcohol (IV), daucosterol (V), beta-sitosterol (VI).

CONCLUSIONThese compounds were not previously isolated from this plant, and isohircinol (I) was obtained from natural source for the first time.

Orchidaceae ; chemistry ; Phenylethyl Alcohol ; analogs & derivatives ; chemistry ; isolation & purification ; Plants, Medicinal ; chemistry ; Sitosterols ; chemistry ; isolation & purification

OBJECTIVETo isolate and elucidate the constituents from rhizome of Arundina graminifolia.

METHODTheconstituents were extracted with 95% alcohol and isolated by chromatography on silica gel, Sephedax LH-20. The structures were determined by UV, IR, NMR and MS spectral analysis.

RESULTFive phenanthrene constituents were identified as 7-hydroxy-2, 4-dimethoxy-9, 10-dihydrophenanthrene( I ), 4, 7-dihydroxy-2-methoxy-9, 10-dihydrophenanthrene ( II ), 2, 7-dihydroxy-4-methoxy-9, 10-dihydrophenanthrene ( III ), 7-hydroxy-2-methoxyphenanthrene-1,4-dione ( IV ), 7-hydroxy-2-methoxy-9, 10-dihydrophenanthrene-1,4-dione (V), respectively.

CONCLUSIONAll compounds were isolated from rhizome of A. graminifolia for the first time.

Orchidaceae ; chemistry ; Phenanthrenes ; chemistry ; isolation & purification ; Plants, Medicinal ; chemistry ; Rhizome ; chemistry

To study the chemical constituents of Nervilia fordii (Hance) Schltr., various chromatographic methods were used, including D101 macroporous resin, silica gel, ODS and preparative HPLC chromatographic techniques. A new labdane diterpenoid glycoside named as nervilifordoside A was isolated from 60% EtOH extract of Nerviliafordii. The structure of compound 1 was elucidated as 12, 17-epoxy-3-hydroxy-17-methoxy-labdan-13-en-16, 15-olide 3-O-alpha-rhamnopyranosyl-(1 --> 2)-O-beta-glucopyranoside on the basis of HR-MS, 1D and 2D NMR spectroscopic data as well as chemical methods.
Chromatography, High Pressure Liquid ; Molecular Structure ; Orchidaceae ; chemistry ; Plants, Medicinal ; chemistry