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Chapter 5 PowerPoint PPT Presentation


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Chapter 5. Seed Selection. Self-pollination. Fixed traits (homozygous) = “inbred”. Self-Pollination. Inbred 1x. Inbred 2x. Non-inbred. Cross-pollination. Fixed traits (homozygous) = “inbred”. Controlled crosses. Controlled crosses. Controlled crosses.

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Chapter 5

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Chapter 5

Seed Selection


Self-pollination

  • Fixed traits (homozygous) = “inbred”


Self-Pollination

Inbred

1x

Inbred

2x

Non-inbred


Cross-pollination

  • Fixed traits (homozygous) = “inbred”


Controlled crosses


Controlled crosses


Controlled crosses


Cross-Pollination& hybrid vigor

B73 B73 x Mo17 Mo17


Cross-Pollination& hybrid vigor

B73 Mo17 B73 x Mo17


Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic

Male Sterility


Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility


Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility


Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility


Sexual incompatibility


Sexual incompatibility

  • Often found in the following plant families:

    • Solanaceae (nightshade family)

    • Rosaceae (rose family)

    • Scrophulariaceae (snapdragon family)

    • Fabaceae (bean family)

    • Poaceae (grass family)


Sexual incompatibility

  • Examples in the rosaceae include:

    • Apples

    • Cherries

    • Plums


Sexual incompatibility

  • Pollen prevented from reaching ovule.

  • Pollen either does not germinate on the stigma or the pollen tube is prevented from traveling down the transmitting cells in the style


Sexual incompatibility

Germination

prevented

Normal pollen

germination


Self-pollinating fruit trees

These include:

  • Peaches

  • Apricots

  • Nectarines


Flower types for cross-pollination

  • Dioecy (dioecious plants)

    • Example: Holly


Flower types for cross-pollination

  • Dioecy (dioecious plants)

    • Example: Holly


Flower types for cross-pollination

  • Monoecy (monoecious plants)

    • Example: Corn


Flower types for cross-pollination

  • Dichogamy (monoecious plant flowering at different times)

    • Example: Squash


Male flower appears a few days earlier than female flower


Flower reproductive parts can be located away from each other


Ecotype

  • A plant that has evolved in relation to its surrounding habitat

  • Ex. Pseudotsuga menziesii

    • Coastal douglas fir

    • Rocky Mountain Douglas fir


Coastal Douglas fir


Rocky Mountain Douglas fir


Cline

  • A continuous variation in a species

  • Ex. Acer rubrum (red maple)


Provenance

The geographic area

where a plant is

native to.


Controlling Genetic Variability

  • Isolation

  • Roguing

  • Pure Stands


Controlling Genetic Variability

  • Isolation

  • Roguing

  • Pure Stands


Controlling Genetic Variability

  • Isolation

  • Roguing

  • Pure Stands


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