principles of agricultural science – plantprinciples of agricultural science – plant 3 value of...
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Principles of Agricultural Science – Plant
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Flower Parts and Function
Unit 4 – Anatomy and PhysiologyLesson 4.5 Flower Power
Principles of Agricultural Science – Plant
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Value of Flowers
Human value:Aesthetics (Beauty)Career and SAE opportunities
The USDA reports 2005 floriculture sales of $5.4 billion in the United States.
Product Sales in 2005Cut Flowers $396.7 million
Potted Flowers and Plants $809 millionBedding and Garden Plants $626.6 million
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Importance of Flowers
Value to the plant – sexual reproduction
Processes of sexual reproduction:PollinationFertilization
Seed development now begins
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Parts of the Flower
Let’s take a minute to review the following parts of the flower:
Parker, 2004
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Female Flower Parts
• Ovule: The “egg cell” of the plant – becomes the seed when fertilized.
• Pollen tube: Transfers pollen from stigma to ovule.
• Pistil– Stigma (part of pistil): Collects pollen.
– Style (part of pistil): Supports stigma.
– Ovary (part of pistil): Contains one or more ovules.
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Male Flower Parts
• Anther: Develops and contains pollen.
• Stamen:– Filament: Supports anther to assist with
pollination.
– Pollen: Male sex cell.
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Supporting Parts
• Petal: Protects pistil and stamens, and attracts insects for pollination.
• Sepal: Outermost leaves protecting the flower during the bud stage.
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Types of Flowers
• Complete: Contains all major flower parts including petals, sepals and both reproductive organs.
• Perfect: Includes both female and male reproductive parts.
• Incomplete: Missing one or more of the sepals, petals, stamens, or pistils.
• Imperfect:– Pistillate– Staminate
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Pistillate Flowers
• The flower is lacking stamens.
The ear on a corn plant is an
example of a pistillate flower.
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Staminate Flowers
• The flower is lacking a pistil.
The tassel on a corn plant is an example of a
staminate flower.
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References
Parker, R. (2004). Introduction to plant science (Rev. ed.). Clifton Park, NY: Delmar.
Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar.
United States Department of Agriculture. (2006). Floriculture and nursery crops yearbook. Retrieved January 20, 2008, from http://usda.mannlib.cornell.edu/usda/ers/FLO-yearbook//2000s/2006/FLO-yearbook-06-23-2006.pdf