Figure 1.

Culturable bacterial population densities [colony forming units (cfu)/ml] present in xylem sap of different olive genotypes extracted with the Scholander chamber or from woody chips macerates from three independent trees per genotype, irrespective of the culture medium used. The number of bacterial isolates selected for 16S taxonomic identification for each treatment is indicated between brackets. For each extraction method, bars with the same letter do not differ significantly among olive genotypes. The “*” indicate for each genotype the existence of significant differences at P≤ 0.05 between both xylem sap extraction methods.