Ch38_Lecture-Spr11

Ch38_Lecture-Spr11 - 38 Reproduction in Flowering Plants 38...

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Reproduction in Flowering Plants 38
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38 Reproduction in Flowering Plants • 38.1 How Do Angiosperms Reproduce Sexually? • 38.2 What Determines the Transition from the Vegetative to the Flowering State? • 38.3 How Do Angiosperms Reproduce Asexually?
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38.1 How Do Angiosperms Reproduce Sexually? In angiosperms, flowers contain sex organs Nearly all reproduce sexually, many reproduce asexually as well Sexual reproduction produces new gene combinations and diverse phenotypes Asexual reproduction produces clones of genetically identical individuals http://www.faculty.sfasu.edu/dgravatt/sedumplant1.jpg Development of plantlets by asexual means may be an efficient mechanism of vegetative reproduction in many plants
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38.1 How Do Angiosperms Reproduce Sexually? In agriculture, both modes are important Many annual crops are grown from seeds (e.g., grains [grasses], soybean, etc.) Other crops such as strawberries, potatoes, and bananas, are produced asexually Navel oranges are seedless, and must be propagated asexually. All descend from one mutant tree www.biology.iastate.edu/Courses/202L/Ne w%20Site%20S05/27AngioReprod/reprod Stawberry plant with stolen www.hort.cornell.edu/4hplants/Fruits/Images/ Seedless navel orange
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38.1 How Do Angiosperms Reproduce Sexually? Sexual reproduction involves mitosis and meiosis and alternation of generations.
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38.1 How Do Angiosperms Reproduce Sexually? A complete flower has four concentric groups of organs arising from modified leaves:
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38.1 How Do Angiosperms Reproduce Sexually? Flower parts are usually borne on a stem tip, and derive from a meristem Differentiation of the meristem is controlled by specific transcription factors Flower parts are very diverse in form http://www.npgrc.tari.gov.tw/npgrc-web/page- picture/diversity/perfumed.jpg
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38.1 How Do Angiosperms Reproduce Sexually? Carpels are female sex organs; stamens are male sex organs. Perfect flowers have both stamens and carpels Imperfect flowers have only stamens or only carpels
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Figure 38.1 Perfect and Imperfect Flowers (Part 1)
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Figure 38.1 Perfect and Imperfect Flowers (Part 2)
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38.1 How Do Angiosperms Reproduce Sexually? Monoecious (―one house‖) Plants that bear both male and female flowers on an individual plant Dioecious Plants that bear either male-only or female-only flowers on an individual plant
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38.1 How Do Angiosperms Reproduce Sexually? A complete flower has four groups of organs (modified leaves): Carpels Stamens Petals Sepals
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38.1 How Do Angiosperms Reproduce Sexually? Carpels are female sex organs Pistil – composed of one or more carpels Style – stalk of pistil, with stigma at the end Ovary – at base of pistil containing ovules , each of which contain a megasporangium Female gametophyte develops in the megasporangium
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38.1 How Do Angiosperms Reproduce Sexually? Stamens
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Ch38_Lecture-Spr11 - 38 Reproduction in Flowering Plants 38...

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