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On the Function of Flowers. 1. Review of reproductive biology 2. Pollination Ecology. -variation in flowers -life cycle. -precise placement -outcrossing -pollination syndromes. Figure 38.2 Review of an idealized flower. Figure 38.3a Trillium.
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On the Function of Flowers 1. Review of reproductive biology 2. Pollination Ecology -variation in flowers -life cycle -precise placement -outcrossing -pollination syndromes
Figure 38.3f Sagittaria: staminate flowers (left), carpellate flowers (right)
On the Function of Flowers 1. Review of reproductive biology 2. Pollination Ecology -variation in flowers -life cycle -precise placement -outcrossing -pollination syndromes
Figure 38.4 The development of angiosperm gametophytes (pollen and embryo sacs)
4 Microspores Tube Cell Generative Cell Dispersed Pollen Grain Pollen Coat
Figure 38.5 Pollen grains have tough, ornate, and distinctive walls
Cross Section of an Ovary One ovule just after meiosis
Figure 38.4 The development of angiosperm gametophytes (pollen and embryo sacs)
Four-nuclear female gametophyte after two mitotic divisions of the megaspore) Mature female gametophyte Egg
Figure 38.9 Growth of the pollen tube and double fertilization
http://gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookflowersII.htmlhttp://gened.emc.maricopa.edu/bio/bio181/BIOBK/BioBookflowersII.html
On the Function of Flowers 1. Review of reproductive biology 2. Pollination Ecology -life cycle -variation in flowers -precise placement -outcrossing -pollination syndromes
On the Function of Flowers 1. Review of reproductive biology 2. Pollination Ecology -life cycle -variation in flowers -precise placement -outcrossing -pollination syndromes
Three paths for pollen flow: selfing: 1. Within flower 2. Between flowers 3. outcrossing (between plants)
Red Maple Flowers staminate pistillate
Foxgloves and outcrossing
Three components to outcrossing in foxglove 1. Young flowers are male, old are female 2. Young flowers are nearer the top 3. Bees fly up. Male zone Then start over at the bottom Bees fly up Female zone
On the Function of Flowers 1. Review of reproductive biology 2. Pollination Ecology -life cycle -variation in flowers -precise placement -outcrossing -pollination syndromes
-pollination syndromes Hummingbird -- -long tube -red color -abundant nectar - no odor - no landing
-pollination syndromes Bat -- -abundant pollen -white or drab color -abundant nectar - good odor - strong landing
Banana (Musa), pollinated by bats, dispersed by monkeys