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Occurrence of arbuscular mycorrhizal fungi on King George Island, South Shetland Islands, Antarctica Anais da ABC (AABC)
BARBOSA,MARISÂNGELA V.; PEREIRA,ELISMARA A.; CURY,JULIANO C.; CARNEIRO,MARCO A.C..
ABSTRACT Arbuscular mycorrhizal fungi make up an important ecological niche in ecosystems, and knowledge of their diversity in extreme environments is still incipient. The objective of this work was to evaluate the density and diversity of arbuscular mycorrhizal fungi in the soil of King George Island in the South Shetland Islands archipelago, Antarctica. For that, soil and roots of Deschampsia antarctica were collected at the brazilian research station in Antarctica. The spore density, species diversity and mycorrhizal colonization in the roots were evaluated. There was a low density of spores (27.4 ± 17.7) and root mycorrhizal colonization (6 ± 5.1%), which did not present statistical difference. Four species of arbuscular mycorrhizal fungi were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; Deschampsia antarctica; Low temperatures; Mycorrhizal fungi.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401737
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Production of phenolic metabolites by Deschampsia antarctica shoots using UV-B treatments during cultivation in a photobioreactor Electron. J. Biotechnol.
Sequeida,Álvaro; Tapia,Eduardo; Ortega,Marcelo; Zamora,Pablo; Castro,Álvaro; Montes,Christian; Zúñiga,Gustavo E; Prieto,Humberto.
Deschampsia antarctica (DA), the only species in the Gramineae family endemic to the Antarctic territory, is characterized by a combination of high levels of free endogenous phenylpropanoid compounds under normal in situ and in vitro growth conditions. In this article, we describe the design and use of a specific temporary immersion photobioreactor to produce both increased DA biomass and secondary metabolite accumulation by UV-B elicitation during cultivation. Three min-long immersions in an induction medium applied every 4 hrs at 14ºC ± 1 and 20/4 hrs light/darkness photoperiod increased DA biomass production over previous in vitro reports. Biomass duplication was obtained at day 10.7 of culturing, and maximum total phenolics and antioxidant activity...
Tipo: Journal article Palavras-chave: Deschampsia antarctica; Phenolic compounds; Temporary immersion bioreactor; UV-B elicitation.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000400008
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