Pollen grains were collected and incubated in GUS staining solution (0.05 mM PBS, pH7.0) with 1 mM 5-bromo-4-chloro-3-indolyl-β-D-Glucopyranosiduronic acid (X-gluc) at 37°C for 15 mins. Then the stained pollen samples were directly mounted on a glass slide for examination under either a Zeiss Axioskop microscope or a Nikon Eclipse Ti microscope. For DAPI staining, pollen tetrads from varies flower stages were released into DAPI solution on a glass slide and observed with a Zeiss Axioskop fluorescence microscope.
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