Expression of the stress marker genes in grapevine normalised with the different Best Combinations or L2. Expression of the four possible abiotic stress marker genes in grapevine plants subjected to WS (A), HS (B), a combination of both (C): PCO – negative marker of WS; Galsynt – positive marker of WS; BkcoAS – negative marker of HS; HSP17– positive marker of HS. Expression was normalised using the three Best Combinations of genes and the worst possible gene (L2). Significant differences (p < 0.05) are represented by ★ when compared to the opposite treatment in the case of WS and HS and in comparison with the respective single treatment in the case of WSHS. ★ of different colours represent the significant differences of the gene expression with the correspondent colour of the reference genes combination.