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Li Q.-Q.,Yunnan Normal University | Li Q.-Q.,China Tobacco Yunnan Industrial Co. | Li Q.-Q.,Yunnan Haoruo Institute of Biotechnology | Dang L.-Z.,China Tobacco Yunnan Industrial Co. | And 5 more authors.
Journal of Asian Natural Products Research | Year: 2015

Three new isocoumarins, terrecoumarins A-C (1-3), together with six known isocoumarins (4-9) were isolated from the fermentation products of the fungus Penicillium oxalicum 0403. Their structures were elucidated by spectroscopic methods, including extensive 1D and 2D NMR techniques. The anti-tobacco mosaic virus (anti-TMV) activities of 1-9 were evaluated. The results revealed that compound 1 showed high anti-TMV activity with inhibition rate 25.4 ± 3.5%. Other compounds also showed weak activity with inhibition rate in the range of 11.3-18.9%. © 2015 Taylor & Francis.

Li Q.-Q.,Yunnan Normal University | Li Q.-Q.,Yunnan Haoruo Institute of Biotechnology | Zhou X.-K.,China Tobacco Yunnan Industrial Co. | Dang L.-Z.,China Tobacco Yunnan Industrial Co. | And 6 more authors.
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology | Year: 2014

A Gram-stain positive, facultative anaerobic endospore-forming bacterium, designated strain YIM h-19T, was isolated from a tobacco sample. Cells were observed to be motile rods by means of peritrichous flagella and colonies were observed to be convex, yellow, circular and showed catalase-positive and oxidase-negative reactions. Strain YIM h-19T was able to grow at 4–45 °C, pH 6.0–8.0 and 0–3 % NaCl (w/v). The predominant respiratory quinone was identified as MK-7. Major fatty acids were identified as anteiso-C15:0, anteiso-C17:0 and C16:0. The polar lipids were found to be phosphatidylethanolamine, diphosphatidylglycerol, phosphatidylglycerol and two unidentified polar lipids. The genomic DNA G+C content was determined to be 54 mol%. 16S rRNA gene sequence analysis showed the strain YIM h-19T was most closely related to Paenibacillus hordei RH-N24T and Paenibacillus hunanensis FeL05T with similarities of 98.30 and 94.64 % respectively. However, DNA–DNA hybridization data indicated that the isolate represented a novel genomic species with the genus Paenibacillus. All data from genotypic and phenotypic analyses support the conclusion that strain YIM h-19T represents a novel species of the genus Paenibacillus, for which the name Paenibacillus nicotianae sp. nov. is proposed. The type strain is YIM h-19T (=CGMCC1.12819T = NRRL B-59112T). © 2014, Springer International Publishing Switzerland.

Yang Z.L.,CAS Kunming Institute of Botany | Qin J.,CAS Kunming Institute of Botany | Qin J.,University of Chinese Academy of Sciences | Xia C.,CAS Kunming Institute of Botany | And 2 more authors.
Phytotaxa | Year: 2015

A new species of Ophiocordycipitaceae, Ophiocordyceps highlandensis, from southwestern China is described using morphological and molecular evidence. It is morphologically characterized by the combination of the following characters: dark-brown to blackish stromata on larvae of Scarabaeidae, fully immersed perithecia with non-protruding ostioles, 3-septate filiform ascospores breaking easily into four part-spores (20) 33–55 × 1.5–2 μm and a hymeniform cortex layer of stipe. Molecular phylogenetic analyses using DNA nucleotide sequences of the nuclear ribosomal small subunit, and the genes encoding the largest subunit of RNA polymerase II and the second-largest subunit of RNA polymerase II indicated that O. highlandensis was related to O. konnoana, O. barnesii, O. nigrella, O. ravenelii and O. superficialis. Ophiocordyceps highlandensis and its related species were all characterized by dark-brown stromata and an affinity for melolonthid larval hosts. A description, line drawings, phylogenetic placement and comparison with allied taxa are presented. © 2015 Magnolia Press.

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