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Saint Petersburg, Russia

The Komarov Botanical Institute of the Russian Academy of science is a leading botanical institution in Russia, It is located on Aptekarsky Island in St. Petersburg, and is named after the Russian botanist Vladimir Leontyevich Komarov . The institute was established in 1931 as merger of the Botanical Garden and the Botanical Museum of the Academy of science.The institute hosts Saint Petersburg Botanical Garden as well as herbarium collections that house over seven million specimens of plants and fungi. The latter is the largest collection in Russia, and among the three largest in the world. Wikipedia.

Golovneva L.B.,RAS Komarov Botanical Institute
Stratigraphy and Geological Correlation | Year: 2014

The following provinces are recognized in the Late Cretaceous within the Asian part of the Siberian-Canadian paleofloristic region: Chulym-Yenisei, Lena-Vilyui, North Siberian, Verkhoyansk, Mountain Okhotsk-Chukotka, Anadyr’, Amur, Sikhote-Alin, and Sakhalin-Japanese. It is proposed to consider the Central Asian (Turan) Province as belonging to the Euro-Sinian paleofloristic region. In the Cenomanian, the province also included the area of the southern Chulym-Yenisei Depression. In the maritime and northern provinces, a considerable occurrence of Mesozoic relics compared to the southern and continental ones is recorded. Similarity and distinctions between the floras of different provinces varied during the Late Cretaceous. Climatic conditions played a considerable role in species diversity and degree of differentiation or unification of the floras. © 2014, Pleiades Publishing, Ltd. Source

Pawlowski K.,University of Stockholm | Demchenko K.N.,RAS Komarov Botanical Institute
Protoplasma | Year: 2012

Filamentous aerobic soil actinobacteria of the genus Frankia can induce the formation of nitrogen-fixing nodules on the roots of a diverse group of plants from eight dicotyledonous families, collectively called actinorhizal plants. Within nodules, Frankia can fix nitrogen while being hosted inside plant cells. Like in legume/rhizobia symbioses, bacteria can enter the plant root either intracellularly through an infection thread formed in a curled root hair, or intercellularly without root hair involvement, and the entry mechanism is determined by the host plant species. Nodule primordium formation is induced in the root pericycle as for lateral root primordia. Mature actinorhizal nodules are coralloid structures consisting of multiple lobes, each of which represents a modified lateral root without a root cap, a superficial periderm and with infected cells in the expanded cortex. In this review, an overview of nodule induction mechanisms and nodule structure is presented including comparisons with the corresponding mechanisms in legume symbioses. © 2012 Springer-Verlag. Source

Nosova N.,RAS Komarov Botanical Institute
Review of Palaeobotany and Palynology | Year: 2013

The revision of the material from the Middle Jurassic sediments of Angren (Uzbekistan), comprising leaves, collar complexes, and seeds originally described together as a new putative pteridosperm genus Grenana Samylina (1990), suggests a ginkgoalean affinity of these plant remains. Morphological and epidermal characters of Grenana leaves fit the diagnosis of Sphenobaiera Florin, on the basis of which a new combination Sphenobaiera angrenica comb. nov. is designated, turning the generic name Grenana into a younger synonym of Sphenobaiera. ". Grenana" collar complexes, considered by Samylina to represent ultimate leaf segments with terminal cupules, are reinterpreted as compound generative axes consisting of peduncles, pedicels, and collars, and similar to female fructifications of the modern and fossil Ginkgo L. A new genus Nagrenia gen. nov. and species Nagrenia samylinae sp. nov. are erected to accommodate this kind of remains. It is confirmed that leaves and collar complexes share a similar epidermal pattern and thus likely represent parts of the same plant. Seeds of three types, all with characteristic ginkgoalean structure, are discovered in association with the leaves of S. angrenica comb. nov. Two kinds of seeds are placed within Allicospermum Harris and one in Ginkgo; a new species Allicospermum angrenicum sp. nov. is described. © 2013 Elsevier B.V. Source

Ilina E.L.,RAS Komarov Botanical Institute
Annals of botany | Year: 2012

In most plant species, initiation of lateral root primordia occurs above the elongation zone. However, in cucurbits and some other species, lateral root primordia initiation and development takes place in the apical meristem of the parental root. Composite transgenic plants obtained by Agrobacterium rhizogenes-mediated transformation are known as a suitable model to study root development. The aim of the present study was to establish this transformation technique for squash. The auxin-responsive promoter DR5 was cloned into the binary vectors pKGW-RR-MGW and pMDC162-GFP. Incorporation of 5-ethynyl-2'-deoxyuridine (EdU) was used to evaluate the presence of DNA-synthesizing cells in the hypocotyl of squash seedlings to find out whether they were suitable for infection. Two A. rhizogenes strains, R1000 and MSU440, were used. Roots containing the respective constructs were selected based on DsRED1 or green fluorescent protein (GFP) fluorescence, and DR5::Egfp-gusA or DR5::gusA insertion, respectively, was verified by PCR. Distribution of the response to auxin was visualized by GFP fluorescence or β-glucuronidase (GUS) activity staining and confirmed by immunolocalization of GFP and GUS proteins, respectively. Based on the distribution of EdU-labelled cells, it was determined that 6-day-old squash seedlings were suited for inoculation by A. rhizogenes since their root pericycle and the adjacent layers contain enough proliferating cells. Agrobacterium rhizogenes R1000 proved to be the most virulent strain on squash seedlings. Squash roots containing the respective constructs did not exhibit the hairy root phenotype and were morphologically and structurally similar to wild-type roots. The auxin response pattern in the root apex of squash resembled that in arabidopsis roots. Composite squash plants obtained by A. rhizogenes-mediated transformation are a good tool for the investigation of root apical meristem development and root branching. Source

Geltman D.V.,RAS Komarov Botanical Institute
Willdenowia | Year: 2013

After the rearrangement of the system of Euphorbia subg. Esula Pers., E. sect. Chylogala (Fourr.) Prokh. contains four species: E. alaica (Prokh.) Prokh. (mountains of Middle Asia), E. heteradena Jaub. & Spach (Southwest Asia), E. retusa Forrsk. (deserts of North Africa and Southwest Asia) and E. serrata L. (West Mediterranean). This group is revised here. Special attention is given to E. alaica, a poorly known species from Kyrgyzstan and Tadjikistan. Lectotypes are designated for the names Euphorbia coriacea K. Koch, E. megalantha Boiss. and E. megalantha var. denticulata Boiss. © 2013 BGBM Berlin-Dahlem. Source

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