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Microbiota of Fossil Animals Preserved in Yakut Permafrost

Journal of Earth Science and Engineering 2014年第8期4卷 484-489页

作者： Neustroev Mikhail Petrovich Tarabukina Nadezhda Petrovna Neustroev Mikhail Mikhailovich Fedorova Marfa Pavlovna stepanova anna mikhailovna Parnikova Svetlana Ivanovna Baishev AlekseyAntonovich Laboratory of Veterinary Biotechnology SSI YSRIA (Yakut Scientific Research Institute of Agriculture) Yakutsk 677001 Russia Laboratory of Microbial Preparations Development SSI YSRIA (Yakut Scientific Research Institute of Agricluture) Yakutsk677001 Russia Institute of Natural Sciences NEFU (North-Eastern Federal University) Yakutsk 677001 Russia

Microbiological investigation of the fossil animals preserved in permafrost represents obvious interest for science. Lack of data in this sphere gives even greater importance to any findings giving us opportunity to learn more about remote past of microorganisms. In this respect, preserved remains of fossil are considered as unique biological materials for scientific investigations. Bacillus bacteria strains isolated from the paleomicrobiota of mammoth fauna are not only have high durability （20-30 thousand of years） in permafrost, but are still able to produce biologically active substances. Strains of bacteria of the genus Bacillus, isolated from the tissues of the representatives of the mammoth fauna have strong antagonistic properties to hemolytic streptococci--Streptococcus equi, pathogenic for animals--Salmonella abortus equi, also toxigenic micromycetes genera Aspergillus, Alternuria, Penicillum and fungal pathogens of plant diseases--Botrytis cimeria and Fuzarium oxysporium. The strains of bacteria of the genus Bacillus are not pathogenic to plants and animals, but initially resistant to wide range of antibiotics. Dominance strains of Bacillus bacteria, producing strong bacteriocins in the soft tissues of fossil animals, contributing to their long cryo bio conservation. In addition, bacterial strains of Bacillus subtilis, isolated from paleo microbiota have strong oxidizing properties. Microbiota of fossils preserved in permafrost of Yakutia is of particular interest for microbiology and modem biotechnology.

关键词： Permafrost mammoth fauna microflora Bacillus modem biotechnology.

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Molecular Mechanisms of Ethylene-Auxin Interaction

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Molecular Plant 2013年第6期6卷 1734-1737页

作者： Linda Robles anna stepanova Jose Alonso Department of Plant and Microbial Biology North Carolina State University Raleigh NC 27695 USA

During the century-long history of plant hormone research, the focus in this area has shifted from the original physi- ological experiments to molecular, genetic, biochemical, and, more recently, genomic approaches. During this jour- ney, we have learned about the many effects these natural compounds have on plant growth and development at the morphological and molecular levels. We have also uncov- ered how these molecules are sensed by the plant cell and how they trigger signaling cascades that relay information to the nucleus, ultimately culminating in a transcriptional cas- cade. With this fundamental knowledge at hand, the main efforts in the field have turned towards a more integrative systems approach, in which the function of a hormone is considered in the context of the complex and dynamic net of interactions with other hormones or, more broadly, with other developmental and environmental signals. Initially, due to the complexity of the problem, most crosstalk studies have focused on pairwise interactions between two or few hormones. Special attention has been given to the interac- tions between ethylene and auxin, perhaps in part because of the experimental tractability of some of the processes in which the interaction between these two hormones is most manifested. An excellent review has been recently written describing the many different processes in which these two hormones are known to interact, either synergistically, such as root growth inhibition, or antagonistically, as is the case for lateral root formation （Muday et al., 2012）. Rather than following this process-centered approach, herein we decided to focus on the molecular mechanisms involved in the inter- action between ethylene and auxin. We take a closer look at the best-known transcriptional and posttranscriptional points of interaction, as well as revisit the most recent experimental findings that suggested additional levels of ethylene-auxin crosstalk.

关键词： Ethylene Auxin Interaction

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Establishment of Rhodiola quadrifida Hairy Roots and Callus Culture to Produce Bioactive Compounds

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 543-552页

作者： anna stepanova Maria Malunova Svetlana Salamaikina Renat Selimov Aleksandra Solov’eva Group of Specialized Root Metabolism К.А.Timiryazev Institute of Plant Physiology RASMoscow127276Russia Bioanalytical laboratory OOO“NVC Agrovetzaschita”Moscow129329Russia

Rhodiola quadrifida is a rare mountain medicinal plant whose root extracts are used in traditional Chinese medicine as a hemostatic,antitussive,and tonic in the treatment of gynecological *** aim of the study was to obtain *** cultures at different degrees of differentiation in vitro and compare their growth characteristics and the content of salidroside and *** roots were obtained by incubating cotyledons and hypocotyls in a suspension of Agrobacterium rhizogenes strain *** presence of the rolB and rolC genes was proven by polymerase chain *** obtained roots were cultivated in Murashige-Skoog medium(MS).Calluses were obtained from the hairy roots in MS medium with the addition of hormones:3 mg/L 2,4 D and 0.5 mg/L *** presence of the main secondary metabolites of ***,salidroside and rosavin,in calluses and salidroside in hairy roots by HPLC/MS was *** content of salidroside in callus culture was significantly higher than in hairy roots,0.158 and 0.047%,*** content of rosavin in callus culture was 0.07%.The content of rosavin and salidroside in callus culture was close to the level of these substances in the rhizomes of *** plants growing in vivo,making this culture promising for its possible biotechnological use.

关键词： Rhodiola quadrifida hairy roots callus culture HPLC salidroside rosavin

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