RT-qPCR analysis of the abundances of the Vvi-MIR399 gene family members under various stress conditions. (a) Expression patterns of the 9 Vvi-MIR399 genes treated with 1000 lx low light for 0, 1, 2, 4, 8, and 12 h. (b) Expression patterns of the 9 Vvi-MIR399 genes treated with 30,000 lx high light for 0, 1, 2, 4, 8, and 12 h. (c) Expression patterns of the 9 Vvi-MIR399 genes in seedlings under 0, 1, 2, and 4 h of heat stress at 45 °C. (d) Expression patterns of the 9 Vvi-MIR399 genes in seedlings under 0, 1, 2, 4, 8, 12, and 24 h of cold stress at 2 °C. (e) Expression patterns of the 9 Vvi-MIR399 genes exposed to drought stress at 0, −0.2, −0.4, −0.6, −0.8, and −1.0 Mpa. (f) Expression patterns of the 9 Vvi-MIR399 genes after exposure to 300 mM NaCl solution for 0, 1, 2, 3, and 5 h. All treatments were conducted with leaves as the tissue material and 0 h as the control. Error bars show the standard errors between three biological replicates. * and ** indicate significant differences at p ≤ 0.05 and p ≤ 0.01, respectively.