Correlation analysis and network construction
R-packages “MASS”, “Hmisc”, “VGAM”, “gplots” and “graphics” (https://www.r-project.org/) were used for analysis and construction of the Spearman correlation between all known metabolites and also between the metabolites and the seed phenotypic traits. In addition, by using the “rcorr” R-package for each sub-population the Spearman correlation between the known metabolites was analysed and the significance level of correlations was described as false discovery rate (FDR). Correlation values with FDR≤0.05 were used to create a correlation network for each maternal environment by using Cytoscape v.3.4.0. The NetworkAnalyser tool of Cytoscape was used to obtain additional characteristics of the metabolic networks.