Ch.38 39 - plant reproduction controls
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Transcript of Ch.38 39 - plant reproduction controls
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Plant Reproduction & Controls
Chapters 38-39
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Simplified overview of angiosperm life cycle
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Review of an idealized flower
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Lily
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Types of Flowers
• Complete – have all four organs (sepals, petals, stamens, carpels)
• Incomplete – Lack one or more organs• Bisexual – has carpels and stamens• Unisexual – has carpels or stamens
• Monoeicous – stamens and carpels located on same plant
• Dioecious – carpels and stamens located on different plants
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Pyrethrum, a composite flower
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Sunflower
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Pollination modes
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The development of angiosperm gametophytes (pollen and embryo sacs)
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Growth of the pollen tube and double fertilization
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Pollen grains have tough, ornate, and distinctive walls
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“Pin” and “thrum” flower types reduce self-fertilization
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Genetic basis of self-incompatibility
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The development of a dicot plant embryo
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Seed structure
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Mobilization of nutrients during the germination of a barley seed
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Seed germination
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Controls
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Review of a general model for signal-transduction pathways
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An example of signal transduction in plants: the role of phytochrome in the greening response
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An Overview of Plant Hormones
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Early experiments of phototropism
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Cell elongation in response to auxin: the acid growth hypothesis
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Apical dominance: with apical bud (left), apical bud removed (right)
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Treating pea dwarfism with a growth hormone
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The effect of gibberellin treatment on seedless grapes
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Experimental evidence for a flowering hormone(s)
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A corn leaf recruits a parasitoid wasp as a defensive response to an herbivore, an army-worm caterpillar
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Structure of a phytochrome
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Phytochrome: a molecular switching mechanism
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Phytochrome regulation of lettuce seed germination
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Biological clocks: Example - sleep movements of a bean plant
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Biological clocks
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Photoperiodic control of flowering