Fig. 1
From: Developmentally regulated mitochondrial biogenesis and cell death competence in maize pollen
Normal (N) and CMS-S pollen development visualized with DAPI stain. A flow diagram of pollen development is presented beneath DAPI-stained images of key developmental stages. a-c N-cytoplasm and f–h CMS-S pollen appearing morphologically identical at the a, f pollen mother cell (PMC); b, g tetrad; and c, h microspore (MSP) stages. d, i Young bi-cellular pollen (YP) with one nucleus fragmenting in CMS-S. e N-cytoplasm, mature, tri-cellular pollen (MP). j Collapsed, bi-cellular CMS-S pollen (CP). k Enlarged detail of nuclei from panel i showing marginalized, fragmented chromatin. Bars = 50 µm