Effect of virulence and serial transfers of Xanthomonas campestris on xanthan gum production

Brazilian Journal of Microbiology

Marcia Nitschke¹  Vanessa Rodrigues¹ 

[1] ,Universidade de Passo Fundo Faculdade de Agronomia Instituto de Ciências BiológicasPasso Fundo RS ,Brasil

关键词: Xanthomonas campestris;    serial transfers;    virulence;    xanthan;    Xanthomonas campestris;    repasses sucessivos;    virulência;    xantana;   

DOI  :  10.1590/S1517-83822000000100014

来源: SciELO

【 摘 要 】

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 vitro" production of xanthan or on viscosity levels, suggesting that the increasing interaction between plant and bacteria did not stimulate the increase in xanthan production and viscosity.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License