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Endophytic colonization of rice (Oryza sativa L.) by the diazotrophic bacterium Burkholderia kururiensis and its ability to enhance plant growth Anais da ABC (AABC)
Mattos,Katherine A.; Pádua,Vania L.M.; Romeiro,Alexandre; Hallack,Leticia F.; Neves,Bianca C.; Ulisses,Tecia M.U.; Barros,Claudia F.; Todeschini,Adriane R.; Previato,José O.; Mendonça-Previato,Lucia.
Burkholderia kururiensis is a diazotrophic bacterium originally isolated from a polluted aquifer environment and presents a high level of similarity with the rice endophyte "B. brasilensis" species. This work assessed the ability of B. kururiensis to endophytically colonize rice plantlets by monitoring different tissues of root-inoculated plants for the presence of bacterial growth in different media, electron microscopy and by 16S rDNA analysis. Observations of roots, stems and leaves of inoculated rice plantlets by electron microscopy revealed B. kururiensis colonization predominantly on root hair zones, demonstrating endophytic colonization primarily through the endodermis, followed by spreading into xylem vessels, a possible pathway leading to aerial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Burkholderia kururiensis; Colonization; Rice; Diazotrophic bacterium; Auxin.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300009
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Sperm and Egg Jelly Coat from Sea Urchin Lytechinus variegatus Collected in Rio de Janeiro Contain Distinct Sialic Acid-Rich Polysaccharides BABT
Valle,Gabrielle M.; Cinelli,Leonardo P.; Todeschini,Adriane R.; Brito-Gitirana,Lycia de; Vilela-Silva,Ana-Cristina E.S.; Mourão,Paulo A.S..
This work found the occurrence of a distinct sialic acid-rich polysaccharide in the sperm surface of the sea urchin Lytechinus variegatus, which differed significantly from a similar molecule found in the egg jelly. The sperm polysaccharide extracted by protease digestion was purified using anion exchange chromatography and characterized using agarose gel electrophoresis, gas chromatography/mass spectrometry and NMR spectroscopy. This polysaccharide was highly sulfated and composed almost exclusively of N-acetylneuraminic acid. In contrast, the sialic acid-rich polysaccharide from the egg jelly was composed of N-glycolylneuraminic acid and contains several other hexoses in its structure. This new molecule could help to characterize in further detail the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sea urchin; Sperm; Egg jelly coat; Fertilization; Sialic acid; Sulfated polysaccharide.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000400617
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