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PA Chapter 21 - Chapter 21 Flowers Reproductive Cycle 1...

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Chapter 21: Flowers: Reproductive Cycle 1 Sporangium type 1 spore type Homospory 2 Sporangia types 2 spore types Heterospory Megaspores (female) or Microspores (male). Microsporogenesis Mircrosporogenesis refers to the formation of microspores by the process of meiosis. This takes place in the microsporangium of the anther. The microspores then rapidly continue development, become multicellular, and produce the microgametophyte , otherwise known as the pollen grain. In the anther, the wall develops epidermis, endothecium (helps to open) and tapetum (inner lining of the pollen sac) layers as the inner sporogenous tissue enlarges and becomes microsporocytes or microspore mother cells. The microgametophyte: Pollen The mature microgametophyte mis multicellular (2 or 3 cells), and has a thick, resistant wall composed of sporopollenin. The wall is composed of an outer portion or exine and an inner portion, the intine. Thinner areas in the wall are apertures that allow for germination; these may be pores or furrows and their numbers and patterns vary.
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