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24.3 Plant Propagation and Agriculture PowerPoint PPT Presentation


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24.3 Plant Propagation and Agriculture. Essential Question’s What is plant propagation?. Vegetative Reproduction. Vegetative reproduction – method a asexual reproduction that produces new plants from stems, plantlets, and underground stems

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24.3 Plant Propagation and Agriculture

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24.3Plant Propagation and Agriculture

Essential Question’s

What is plant propagation?


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Vegetative Reproduction

  • Vegetative reproduction – method a asexual reproduction that produces new plants from stems, plantlets, and underground stems

  • Plants grows by mitosis alone – no sexual reproduction

  • Enables plant to produce may offspring genetically identical to itself

  • Plants can reproduce very quickly since it does not involve pollination or seed formation


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  • Plants can also reproduce by growing horizontal stems called stolons.

  • Strawberry plants are examples

  • Stolons produce roots when they touch the ground

  • Some plants like bamboo grow underground stems that allow plants to send up new shoots


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Stolons of a Strawberry Plant


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Plant Propagation

  • Propagation uses cuttings, grafting, or budding to make many identical copies of a plant or to produce offspring from seedless plants.

  • Plant hormones are often used to stimulate cuttings to grow

  • Grafting and budding are used to reproduce seedless plants and woody plants that do not produce strong root systems


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Cont’d

  • A piece of stem is cut from the parent plant and attached to another plant

  • The cut piece is called the scion and the plant to which it is attached is called the stock

  • When wood stems are used as scions, the process is called grafting.

  • When buds are used as scions, the process is called budding.


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Cont’d

  • Grafting works best when plants are dormant because wounds created can heal before new growth starts.


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Figure 24-17


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Agriculture

  • Agriculture is the systematic cultivation of plants

  • Developed about 10,000 to 12,000 years ago

  • Agriculture is the principal occupation of humans

  • Most people of world depend on a few crop plants such as wheat, rice, and corn for the bulk of their food supply.

  • About 80% of US cropland is used to grow just four crops: corn, wheat, soybeans, and hay.


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