The diversity and antibacterial activity of culturable actinobacteria isolated from the rhizosphere soil of Deschampsia antarctica (Galindez Island, Maritime Antarctic)

Polar Biology ◽  
2021 ◽  
Author(s):  
Stepan Tistechok ◽  
Maryna Skvortsova ◽  
Yuliia Mytsyk ◽  
Victor Fedorenko ◽  
Ivan Parnikoza ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Rhizosphere Soil ◽  
Deschampsia Antarctica ◽  
Maritime Antarctic

scholarly journals New forms of chromosome polymorphism in Deschampsia Antarctica Desv. from the Argentine Islands of the Maritime Antarctic region

2014 ◽  
pp. 185-191 ◽  
Author(s):  
D. O. Navrotska ◽  
◽  
M. O. Twardovska ◽  
I. O. Andreev ◽  
I. Yu. Parnikoza ◽  
...  
Keyword(s):  
Deschampsia Antarctica ◽  
Chromosome Polymorphism ◽  
Maritime Antarctic ◽  
Antarctic Region

Adaptation of the seed reproduction system to conditions of Maritime Antarctic in Deschampsia antarctica E. Desv.

2016 ◽  
Vol 47 (3) ◽  
pp. 138-146 ◽  
Author(s):  
O. I. Yudakova ◽  
V. S. Tyrnov ◽  
V. A. Kunakh ◽  
I. A. Kozeretskaya ◽  
I. Yu. Parnikoza
Keyword(s):  
Deschampsia Antarctica ◽  
Maritime Antarctic ◽  
Seed Reproduction ◽  
Reproduction System

Lipid content in leaves of Deschampsia antarctica from the maritime antarctic

1994 ◽  
Vol 37 (3) ◽  
pp. 669-672 ◽  
Author(s):  
Gustavo E. Zúñiga ◽  
Miren Alberdi ◽  
Julio Fernández ◽  
Pedro Móntiel ◽  
Luis J. Corcuera
Keyword(s):  
Lipid Content ◽  
Deschampsia Antarctica ◽  
Maritime Antarctic

Reproduction of Antarctic flowering plants

1996 ◽  
Vol 8 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Peter Convey
Keyword(s):  
Seed Production ◽  
Higher Plants ◽  
Deschampsia Antarctica ◽  
Maritime Antarctic ◽  
South Georgia ◽  
Reproductive Structures ◽  
Signy Island ◽  
Reproductive Biomass ◽  
Vegetative Biomass ◽  
Time Required

Reproductive allocation (reproductive biomass relative to vegetative biomass) and seed production were measured for samples of the two native phanerogams occurring in Antarctica. Material collected on South Georgia (subantarctic), Signy Island (northern maritime Antarctic) and Léonie Island (southern maritime Antarctic) allowed an initial comparison of reproduction over a wide latitudinal range. Sizes of vegetative and reproductive structures of Colobanthus quitensis were smaller in Signy Island samples than those from South Georgia or Léonie Island. This pattern was reflected in the pattern of seed production. Vegetative and reproductive structures of Deschampsia antarctica were generally similar in size at both maritime Antarctic sites, but larger at subantarctic South Georgia. Seed production was similar in each season assessed and at all three sites. In most samples of both species there were close relationships between reproductive and vegetative biomass, and seed output and reproductive biomass. Subantartic C. quitensis showed greater allocation to seed production than material from maritime Antarctic sites. D. antarctica showed the reverse pattern, with greater allocation to reproductive biomass and seed production in most samples of maritime Antarctic material, particularly those from Signy Island. Reproductive strategies do not form any specific adaptation to the Antarctic environment for these species. Reasons for the failure of other higher plants to become established in the maritime Antarctic are discussed, and it is concluded that geographical isolation is the main factor. The most important proximate factors influencing propagules which reach potential colonization sites are likely to be the short length and low temperature of the summer season in relation to the time required for establishment.

scholarly journals The occurrence and development of peat mounds on King George Island (Maritime Antarctic)

2014 ◽  
Vol 66 (2) ◽  
pp. 223-229 ◽  
Author(s):  
Jerzy Fabiszewski ◽  
Bronisław Wojtuń
Keyword(s):  
Initial Phase ◽  
Radiocarbon Dating ◽  
Floristic Composition ◽  
Deschampsia Antarctica ◽  
King George Island ◽  
Maritime Antarctic ◽  
South Shetlands ◽  
Peat Formation ◽  
The Antarctic ◽  
Further Development

On King George Island, South Shetlands Islands, a type of peat formation has been discovered which has not previously been reported from the Antarctic. These formations are in shape of mounds up to 7x 15 m in area, with a peat layer of about I m thick. About twenty five cm below the surface there is a layer of permanently frozen peat. The mounds are covered by living mosses (<em>Polytrichum alpinum</em> and <em>Drepanocladus uncinatus</em>), Antarctic hair grass (<em>Deschampsia antarctica</em>) and lichens. Erosion fissures occurring on the surface are evidence of contemporary drying and cessation of the mound's growth. The initial phase of the development of the mounds began with a community dominated by <em>Calliergidium austro-stramineum</em> and <em>Deschampsia antarctica</em>, and their further development has been due to peat accumulation formed almost entirely by <em>Calliergidium</em>. The location of the mounds is near a penguin rookery, which clearly conditioned the minerotrophic character of these formations, as compared with the "moss peat banks" formed by <em>Chorisodontium aciphyllum</em> and <em>Polytrichum al-pestre</em>. Moreover, the peat mounds differ from the latter in several ways, e.g. rate of growth and floristic composition. Radiocarbon dating of peat from the base of one mound gave an age of 4090±60 years B.P. This suggests that the age of the tundra on King George Island is about 5000-4000 years.

scholarly journals First record of the endophytic bacteria of Deschampsia antarctica Ė. Desv. from two distant localities of the maritime Antarctic

2021 ◽  
Vol 11 (1) ◽  
pp. 134-153
Author(s):  
Olga Podolich ◽  
Ievgeniia Prekrasna ◽  
Ivan Parnikoza ◽  
Tamara Voznyuk ◽  
Ganna Zubova ◽  
...  
Keyword(s):  
Endophytic Bacteria ◽  
Bacterial Species ◽  
Vascular Plant ◽  
South Shetland Islands ◽  
Deschampsia Antarctica ◽  
Rrna Gene ◽  
King George Island ◽  
Maritime Antarctic ◽  
Organic Input

Endophytic bacteria, recognized for their beneficial effects on plant development and adaptation, can facilitate the survival of Antarctic plants in severe environments. Here we studied endophytes of the vascular plant Deschampsia antarctica Ė. Desv. from two distantly located regions in the maritime Antarctic: King George Island (South Shetland Islands) and Galindez Island (Argentine Islands). Bacterial group-specific PCR indicated presence of Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Firmicutes, Cytophaga-Flavobacteria and Actinobacteria in root and leaf endosphere of D. antarctica sampled at four distinct sites of both locations. The diversity of endophytic bacteria was significantly higher in the leaves compared to the roots in plants from Galindez Island. Similarly, the diversity of endophytes was higher in the leaves rather than roots of plants from the King George Island. Twelve bacterial species were isolated from roots of D. antarctica of Galindez Island (the Karpaty Ridge and the Meteo Point) and identified by sequencing the 16S rRNA gene. Isolates were dominated by the Pseudomonas genus, followed by the genera Bacillus and Micrococcus. The vast majority of the isolates exhibited cellulase and pectinase activities, however, Bacillus spp. expressed neither of them, suggesting lack of genetic flow of these traits in endophytic bacilli in the maritime Antarctic. Pseudomonas sp. IMBG305 promoted an increase in the leaf number in most of the treated plant genotypes when compared with non-inoculated plants, and a rapid vegetation period of D. antarctica cultured in vitro, albeit the length of leaves in the treated plants was significantly lower, and flavonoid content leveled off in all treated plants. D. antarctica is known to develop diverse ecotypes with regard to ecological conditions, such as organic input, moisture or wind exposition. The D. antarctica phenotype could be extended further through the endophyte colonization, since phenotypic changes were observed in the inoculated D. antarcticaplants grown in vitro in our study. Herewith, endophytes can contribute to plant phenotypic plasticity, potentially beneficial for adaptation of D. antarctica.

scholarly journals Comparative analysis of Deschampsia antarctica Desv. population adaptability in the natural environment of the Admiralty Bay region (King George Island, maritime Antarctic)

Polar Biology ◽  
2015 ◽  
Vol 38 (9) ◽  
pp. 1401-1411 ◽  
Author(s):  
Ivan Parnikoza ◽  
Natalia Miryuta ◽  
Iryna Ozheredova ◽  
Iryna Kozeretska ◽  
Jerzy Smykla ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Natural Environment ◽  
Deschampsia Antarctica ◽  
King George Island ◽  
Maritime Antarctic ◽  
Admiralty Bay

Salt tolerance traits in Deschampsia antarctica Desv.

2016 ◽  
Vol 28 (6) ◽  
pp. 462-472 ◽  
Author(s):  
Daisy Tapia-Valdebenito ◽  
León A. Bravo Ramirez ◽  
Patricio Arce–Johnson ◽  
Ana Gutiérrez-Moraga
Keyword(s):  
Sea Spray ◽  
Deschampsia Antarctica ◽  
Leaf Epidermis ◽  
Salt Tolerant ◽  
Maritime Antarctic ◽  
Root Cells ◽  
Sodium Transporters ◽  
Sodium Flux ◽  
Salt Crystals ◽  
Salt Overly Sensitive

AbstractDeschampsia antarctica Desv. (Poaceae) grows in coastal habitats in the Maritime Antarctic where it is often exposed to sea spray. Salt crystals have been observed on the surface of leaves in plants treated with high NaCl. We investigated if D. antarctica is a salt tolerant species that allows sodium ions to diffuse into the root where a salt overly sensitive (SOS) system extrudes Na+ from root cells and facilitates its movement through the xylem up to the leaves. Leaf epidermis, physiological parameters and sodium transporters in D. antarctica plants exposed to NaCl were studied over 21 days. Epidermal scanning electron microscopy showed trichome induction in the leaves of salt treated plants. In addition, salt treated plants showed increased sodium and proline levels with a concomitant increased expression of SOS genes (1 and 3). These results indicate that Na+ is taken up by the roots of D. antarctica and transported to the leaves. The sodium flux may be controlled by SOS1 activity. Up-regulation of the SOS1 gene may be involved in the increased sodium levels observed in the leaves of salt treated plants. Trichomes may also be involved in sodium exudation through the leaves under saline conditions.

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