Cell biological analyses of wild-type, cle19-2, DN-CLE19, and CLE19-OX anthers. A to E, Wild-type (WT) anther morphology using semithin transverse sections. F to J, Morphology of cle19-2 anthers using semithin transverse sections. K to O, Morphology of DN-CLE19 anthers using semithin transverse sections. P to T, Morphology of CLE19-OX-S anthers using semithin transverse sections. U to Y, Morphology of CLE19-OX-M anthers using semithin transverse sections. Z to AA, Statistical analyses of the tapetal or reproductive cell numbers in DN-CLE19, CLE19-OX, and wild-type anthers, respectively. *P < 0.05 by Student's t-test. AB, How the numbers of tapetal or reproductive cells in each lobe in transverse sections were calculated. DPG, Degenerated pollen grains; Ms, meiocytes; PG, pollen grains; T, tapetum. Bars = 20 μm.