Fig. 4
From: Reactive oxygen species mediate tapetal programmed cell death in tobacco and tomato
Tapetal PCD during tobacco anther development by TUNEL assays. a–d Fluorescence microscope of cross-sections of tobacco anthers at stage 9 (a), stage 10 (b), stage 11 (c), and stage 12 (d). Green fluorescence indicates TUNEL-positive signals while red fluorescence indicates propidium iodide (PI) staining. Corresponding transmission images are placed below the fluorescence images. Bars, 50 μm