Redundant genes of the MYB family are involved in regulating the expression of sporopollenin synthesis genes. A, pMS188::MS188-SRDX and pAMS::MS188-SRDX constructs. B to E, Fertility comparison between wild-type (WT), ms188, pMS188::MS188-SRDX (ms188−/−), and pAMS::MS188-SRDX (ms188−/−) plants, respectively. F, Reverse transcription quantitative PCR (RT-qPCR) analysis of TKPR1, TKPR2, CYP704B1, and ACOS5 expression in the inflorescences of WT, ams, ms188, pMS188::MS188-SRDX (ms188−/−), and pAMS::MS188-SRDX (ms188−/−) plants. y axis is shown as relative expression, and error bar is indicated as sd.