highly significantp ≤ 0.001
To evaluate whether an increasing BtMV content in BtMV‐MYB‐infected plants correlates with an increased gene expression of BvMYB1 , BvDODA and BvCYP76AD1 , a linear regression model was used to prove a highly significant correlation ( r 2 ≥ 0.95, p ≤ 0.001) between increasing BtMV content and increased gene expression for the betalain biosynthesis genes (Figure 8 ).