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Figure 5 | BMC Plant Biology

Figure 5

From: Pollen development in Annona cherimola Mill. (Annonaceae). Implications for the evolution of aggregated pollen

Figure 5

Microgametogenesis in Annona cherimola. (A) Microspores increase in size as vacuoles appear in the cytoplasm, (B) microspores at this stage do not have starch grains. (C) Microspores following mitosis I; (D) as vacuoles decrease in size, starch grains are stored. (E) Young pollen grains without vacuoles (F), which accumulated starch grains. (G) Close to the time of anther dehiscence, the second mitosis occurs, the tapetum is completely degenerated and (H) starch is digested. Longitudinal sections of anthers stained with PAS and Toluidine blue (A, C, E, G), and with PAS (B, D, F, H) to show starch grains. Bar = 20 Ī¼m.

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