Fig. 2
From: Molecular mapping of a novel locus S68 for intrasubspecific hybrid sterility in indica-indica hybrid
Cytological observation of pollen grains in IR64, F1 and NIL-S68. (a–c) Anther morphology of IR64, F1 and NIL-S68, respectively. Scale bar, 200 μm. (d–f) The morphology of mature pollen grains from IR64, F1 and NIL as analyzed by SEM, respectively. Scale bar, 20 μm. Green arrows indicated the normal pollen grains and red arrows noted the aborted pollen grains. (g–i) The magnified mature pollen grain observed by SEM from IR64 (g), F1 (h) and NIL-S68 (i), respectively. Scale bar, 5 μm. (j–l) The transverse section of mature pollen grains from IR64 (j), F1 (k) and NIL-S68 (l), as observed by TEM. Scale bar, 5 μm. (m–o) Thinner pollen wall in IR64 (m) and NIL-S68 (o), and thicker pollen wall in F1 (n). Scale bar, 500 nm. Ex, exine; In, intine; Te, tectum; Ne, nexine; Ba, bacula.
