Fig. 1

Heatmaps of correlation between GRY and other studied traits in (a) E1, (b) E2, (c) E3, (d) E4. Positive correlations of traits with grain yield are shown in green and negative correlations of grain yield with other traits are shown in red. The intensity of the colors indicates the strength of the correlation. The environments E1, E2, E3, E4 are defined in Table 3, Grain yield: GRY, Leaf proline content: PRN, Soluble leaf sugars: CBD, Anthocyanin: ANT, Phenolic compound content: PNL, Root colonization percentage: CPR, Polyphenol oxidase: POX, Superoxide dismutase: SOD, Catalase: CAT, Ascorbate peroxidase: APX, Guaiacol peroxidase: GPX., OM: magnesium oxide treatments, MI: Mycorrhizal fungi treatments.