FIG 5.

Three two-dimensional (2-D) principal component analyses (PCA), visualizing the aromatic diversity introduced by the newly developed interspecific hybrids (black dots) and 7 reference Saaz-type (light blue dots) and 10 reference Frohberg-type (dark blue dots) S. pastorianus strains. Ninety-percent confidence ellipses are drawn in the corresponding colors. The component scores for the 12 aroma compounds are depicted as red lines numbered as follows: 1, acetaldehyde; 2, ethyl acetate; 3, ethyl propionate; 4, isobutyl acetate; 5, ethyl butyrate; 6, propanol; 7, isobutanol; 8, isoamyl acetate; 9, butanol; 10, isoamyl alcohol; 11, phenylethyl acetate; 12, phenyl ethanol. The three 2-D PCA plots represent 66.87% of the total variance of the data set.