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Summa Phytopathologica

versão impressa ISSN 0100-5405versão On-line ISSN 1980-5454

Resumo

BONALDO, Solange Maria  e  PASCHOLATI, Sérgio Florentino. Effect of fractions partially purified from Saccharomyces cerevisiae on conidium germination and appressorium formation by Colletotrichum sublineolum and Colletotrichum lagenarium. Summa phytopathol. [online]. 2007, vol.33, n.3, pp.233-238. ISSN 0100-5405.  https://doi.org/10.1590/S0100-54052007000300004.

The objective of this study was to verify the effect of preparations or fractions partially purified from S. cerevisiae, autoclavad for 4 hours sequentialy, submitted to ion-exchange chromatography (IEC), using Tris-HCl or ammonium bicarbonate buffers, on the in vitro conidium germination (CG) and appressorium formation (AF) of C. lagenarium and C. sublineolum. A total of 40 µL of each preparation or fraction was placed inside the wells of ELISA plates with 40 µL of a spore suspension (1 x 105 conidia/mL) of C. lagenarium or C. sublineolum. After incubation, CG and AF were determined. Distilled water was used as control. All the preparations from the autoclavad yeast stimulated CG, without AF for both pathogens. Fractions from IEC, with Tris-HCl buffer, induced CG for C. sublineolum and C. lagenarium. For AF by C. lagenarium there was a stimulus by the fractions IV, V and VI without difference in AF by C. sublineolum. With the fractions obtained by IEC, using ammonium bicarbonate buffer, there was a stimulation of CG by C. lagenarium by the fractions I and IV and an inhibitory effect of the germination by the fractions V, VI and VII. There was no AF in the presence of fraction I and the other fractions exhibited inhibitory effect on AF by C. lagenarium. The fractions I and II stimulated CG and AF by C. sublineolum and other fractions presented inhibitory effect. Thus, it was showed the importance to select specific buffers during the purification of fractions of S. cerevisiae. This can result in fractions that stimulate CG and AF of these pathogens or in fractions with inhibitory activity on conidium germination that can contribute to control dispasps caused by these pathogens.

Palavras-chave : Ion-exchange chromatography; yeast; phytopathogens.

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