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One new indole diterpenoid, drechmerin I (1), was isolated from the fermentation broth of Drechmeria sp. isolated from the root of Panax notoginseng. Its structure was elucidated based on 1 D and 2 D nuclear magnetic resonance (NMR), high resolution electrospray ionization mass spectrum (HRESIMS), and electronic circular dichroism (ECD) spectroscopic analyses as well as TD DFT calculations of ECD spectra. Drechmerin I (1) was assayed for its antimicrobial activity against Candida albicans, Staphylococcus aureus, Bacillus cereus, B. subtillis, Pseudomonas aeruginosa, and Klebsiella pneumonia, respectively. Drechmerin I (1) showed antimicrobial activities against B. subtillis with an MIC value of 200 μg/mL. The interaction of S. aureus peptide deformylase with drechmerin I (1) was investigated by molecular docking. [ABSTRACT FROM AUTHOR]

The Panax notoginseng is an important Chinese herbal medicine (CHM) and the quality is affected by growing environment. UV spectra approach was used to study the relationships between UV spectra of P. notoginseng and locations, rapidly. The UV spectra of fifty P. notoginseng samples which collected from ten regions were obtained and processed by using mean value, smoothing and derivative. The numbers of common peaks of chloroform, ethanol and water extractions were compared, respectively and the best extraction solvent was confirmed. The differences and relationships of P. notoginseng samples from different locations were investigated by comparing the characteristics of UV spectra combined with partial least square discriminant analysis (PLS-DA). The results showed that the extract ratio was the best in chloroform and the RSD% of precision, repeatability and stability in 30 h were 0.00～0.42, 0.00～0.54 and 0.00～0.60, respectively. The spectra of samples collected from different areas were similar except the absorbance. It could display the fingerprint characteristics. The common peaks of UV spectra were 194, 200, 204, 210 and 218 nm and the peaks absorption value ranged from 0.00 to 4.00. It showed that the main constituent had low correlation with collection regions while the content may be affected by the collection areas. The PLS-DA score plots could show the relationships among the P. notoginseng from different locations. In conclusion, this qualitative method could evaluate P. notoginseng samples from different locations rapidly and exactly. Moreover, it could provide the reference for source discrimination of CHM.

Objective: To find out variety of the fungal diseases of cultivated Gentiana rigescens and provide important basis for prevention., Methods: The diseases were diagnosed based on field investigate, symptoms observation, pathogen isolation, determination the size of morphological and verification following the Koch's Postulate procedures., Results: Anthracnose (Colletotrichum gloeosporioides), grey mould (Botrytis cinerea), brown spot (Alternaria tenuis), rust (Aecidiumpers), circular spot (Pestalotiopsis), leaf blight (Stemphylium, Ascochyta, Pleospora) and nematodes (Heterodera spp., Meloidogyne spp.) were found on Gentiana rigescens. Anthracnose was the first main disease, the diseased plant rate was over 40% and disease severity was 4 - 5 degree and second disease was rust, incidence of rate was less 10% and other diseases rate was not enough 2%., Conclusion: All these diseases on Gentiana rigescens are reported for the first time and Gentiana rigescens is the new host plant of the diseases.