Fig. 1

Phenotypes of anthers and pistils in the male-sterile (MS) line and its near-isogenic male fertile (MR) line. stage 1: early uninucleate stage (A, E); stage 2: late uninucleate stage (B, F); stage 3:binucleate stage(C, G); stage 4:trinucleate stage (D, H). the 2% I2-KI staining pollen grains (D, H, bottom left). Red arrows indicate mature pollen grains (D). Scale bars: 0.5 mm in (A- H), 50 µm in the bottom left of(D, H)