Expression profiles of <i>SiNAC</i> genes in roots of drought-tolerant (DT) and drought-sensitive (DS) cultivars after drought treatment.

<p>d0 (control), d1, d2, and d3 indicated the samples harvested with the soil water content at 35%, 15%, 9%, and 6%, respectively. Log₂-transformed values of the relative expression levels of the <i>SiNAC</i> genes under drought stress were used to create the heat map. Changes in gene expression are shown in color as the scale.