Dominant bacterial genera in tobacco leaf positions of cured tobacco for wrapper. Influence of nicotine and pH in their population density
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Abstract
fermentation process, in Cuba never has been identified the
genera present in the cured tobacco for wrapper, neither the
variables that affect their populations. This knowledge will be
aid to management the process in which the microorganisms
are involved. The objective of this research was to determine
the relationship between population density of the bacterial
genera with dominant populations in cured tobacco leaves of
different leaf positions of the stalk and nicotine concentrations
and pH values in these environments. The isolation and generic
identification of bacterial microbiota was done for each tobacco
leaves positions and pH values and nicotine concentrations
were obtained too. Members of the genus Bacillus were
isolated in all leaf positions. Staphylococcus members were
not isolated at the «leaf» tobacco stalk positions.
Representatives of the Arthrobacter genus were isolated only
in both leaves positions «cutters» and «leaf». Bacillus
populations were always higher than the other genera isolated.
Nicotine was significantly increase and pH was show a slight
nonsignificant (p<0,01) decrease, the population density of
bacteria isolated in all genres decreased from lowest to highest
leaf positions. The regression model reveals that the decrease
in population density of bacterial genera that is appraised to
climb different leaves positions is more related to the increased
of nicotine concentration in the leaves than with the variation
of pH.
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