Figure 4.

MON1 mutation results in delayed tapetum degeneration. Semithin sections showed delayed tapetum degeneration in mon1-2 compared with the wild type (WT). Transverse semithin sections of wild-type (A–F) and mon1-2 (G–L) anthers at indicated stages were represented. The tapetal cells were completely degenerated at stage 12 in the wild type (F); however, residue from degenerating tapetal cells remained at stage 12 in mon1-2 (L). The arrows in D, E, and J to L indicate tapetal cells. Bars = 20 μm.