Reference Gene Selection for Quantitative Real-Time RT-PCR Normalization in Iris. lactea var. chinensis Roots under Cadmium, Lead, and Salt Stress Conditions

Figure 1

Absolute cycle threshold values (𝐶_𝑡) for seven reference genes. Boxes indicate the 25th/75th percentiles, the line marks the median, squares represent the means, and whiskers indicate the ranges for total samples.