Fig. 4
Principal components (PCA) statistical analysis of the argan oil effects on the physiological and biochemical biomarkers with a total variance represented of 70 %. Component 1 reflects a 39.55 % total variance (with a positive correlation with biomass yield, fermentative capacity and trehalose levels) and Component 2 reflects a 30.45 % total variance (with a positive correlation with glutathione reductase activity). The lines belong to variance of dependent variables or biochemical biomarkers measured (biomass yield, fermentative capacity, lipid peroxidation, protein carbonylation, protective metabolites and enzymatic activities) arranged in two dimensions according to the components 1 and 2. Study strains and conditions (control and argan oil supplementation) are labelled with different symbols: T73 (+); D18 (unfilled square); D170 (filled circle); D301 (unfilled diamond); D128 (Asterisk); D272 (−); P6 (triangle) and they appear associated with the dependent variable that differs from other strains and conditions