Extended Data Fig. 3: Sections of anther development stages.

Corresponding stages are shown for wild type (A-D, I-L) and skr-1 (E-H, M-P). Stages are numbered according to (Sanders⁴⁹). Abbreviations: E epidermis, En endothecium, ML middle layer, T tapetum, Td tetrad, Msp microspore, DM degenerating microspore, PG pollen grain, St stomium, MD microspore debris. Scale bar 20 µm. The experiment was repeated repeated twice.