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| Cavalcanti,Fábio Rossi; Resende,Mário Lúcio Vilela de; Pereira,Ricardo Borges; Costa,João de Cássia do Bonfim; Carvalho,Cristina Paiva da Silveira. |
| O objetivo deste trabalho foi avaliar a influência de eliciadores biológicos e químicos sobre as atividades de duas proteínas relacionadas à patogênese (PR), quitinase e beta-1,3-glucanase, em folhas de tomateiro, e avaliar o potencial desses eliciadores na redução do progresso da mancha-foliar causada por Xanthomonas campestris pv. vesicatoria. Plantas de tomateiro da cultivar Santa Cruz Kada foram pulverizadas com: acibenzolar-S-metil (ASM; 0,2 g L-1); formulação biológica proveniente de biomassa cítrica, denominada Ecolife (5 mL L-1); suspensão de quitosana (MCp; 200 g L-1), proveniente de micélio de Crinipellis perniciosa; extrato aquoso de ramos de lobeira (Solanum lycocarpum) infectados por C. perniciosa (VLA; 300 g L-1). As plantas foram desafiadas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycocarpum; Xanthomonas campestris; Acibenzolar-S-metil; Extratos biológicos; Resistência induzida. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006001200006 |
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| Luvielmo,Márcia de Mello; Borges,Caroline Dellinghausen; Toyama,Daniela de Oliveira; Vendruscolo,Claire Tondo; Scamparini,Adilma Regina Pippa. |
| Abstract The effect of alkali stress on the yield, viscosity, gum structure, and cell ultrastructure of xanthan gum was evaluated at the end of fermentation process of xanthan production by Xanthomonas campestris pv. manihotis 280-95. Although greater xanthan production was observed after a 24 h-alkali stress process, a lower viscosity was observed when compared to the alkali stress-free gum, regardless of the alkali stress time. However, this outcome is not conclusive as further studies on gum purification are required to remove excess sodium, verify the efficiency loss and the consequent increase in the polymer viscosity. Alkali stress altered the structure of xanthan gum from a polygon-like shape to a star-like form. At the end of the fermentation,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xanthomonas campestris; Xanthan production; Alkali stress; Transmission microscopy; Scanning electron microscopy. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000100102 |
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| Nitschke,Marcia; Rodrigues,Vanessa. |
| The virulence of six Xanthomonas campestris isolates was evaluated using the percentage of lesion area of leaves in Brassica oleraceae host plant, compared to diameter of colonies, xanthan production and gum viscosity. In terms of virulence, the isolates belonged to two statistically different groups: isolates B, UPF and C7 showed values between 52 and 69%, while isolates CF, C and strain B-1459 gave 0-30% of lesion area. Final xanthan concentration, gum viscosity and colony diameter did not correlate with virulence calculated by percentage of lesion area, showing that this parameter is not a good criterium for selection of potential xanthan producer isolates. Serial transfers of X. campestris isolates in host plant did not show a significant effect on "in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xanthomonas campestris; Serial transfers; Virulence; Xanthan. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000100014 |
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