08%20Flowers%20%26%20Induction

08%20Flowers%20%26%20Induction - Flowers / Floral Induction...

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Flowers / Floral Induction
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Objectives Consider the diversity of flowers & floral structures Discuss how flowering in controlled in plants Consider how horticulturists manipulate flowering
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Functions of Flowers For the plant: Reproduction Allows for maintenance of genetic diversity (& adaptability to changes / evolution) For the horticulturist: Fruit and seed production (1st step)
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Pistil Ovary Style Stigma Stamen Petal (coll. = corolla) Sepal (coll. = calyx) Receptacle Peduncle Anther Filament Ideal Flower
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Whorls of Floral Parts Pistil Anther Petals Sepals
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Functions of Floral Parts Peduncle/Receptacle Calyx (sepals) Corolla (petals) Stamens Pistil Support Protection in the bud Attract pollinators Produce & distribute male gametes Produce & contain ovules, screen male gametes, place for seed development
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Variations on the “Ideal” A flower lacking any one or more parts (sepals, petals, stamens, pistils) A flower lacking one sex or the other
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A flower with all parts COMPLETE
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A flower lacking some part INCOMPLETE
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A Flower with both sexes PERFECT The flower may or may not have sepals and/or petals, but it does have both sexes
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A flower lacking one sex IMPERFECT The flower may or may not have sepals and/or petals, but it has only one sex
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All imperfect flowers are incomplete Think about it: if a flower lacks one sex it must lack one part Not all incomplete flowers are imperfect ! Think about it: if a flower lacks one part it may still have both sexes present
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Plants with imperfect flowers May have both sexes on the same plant Monoecious (literally mono=one, oikos=house Gr.) One house, one plant Or only one sex on any single plant Dioecious (literally di=two, oikos=house Gr.) Two houses, two plants
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This note was uploaded on 02/07/2011 for the course HORT 100 taught by Professor Dana during the Spring '11 term at Purdue University-West Lafayette.

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08%20Flowers%20%26%20Induction - Flowers / Floral Induction...

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