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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

Seed Selection


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Self-pollination

  • Fixed traits (homozygous) = “inbred”


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Self-Pollination

Inbred

1x

Inbred

2x

Non-inbred


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Cross-pollination

  • Fixed traits (homozygous) = “inbred”





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Cross-Pollination& hybrid vigor

B73 B73 x Mo17 Mo17


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Cross-Pollination& hybrid vigor

B73 Mo17 B73 x Mo17


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Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic

Male Sterility


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Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility


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Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility


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Avoiding self-pollination

  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility



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Sexual incompatibility

  • Often found in the following plant families:

    • Solanaceae (nightshade family)

    • Rosaceae (rose family)

    • Scrophulariaceae (snapdragon family)

    • Fabaceae (bean family)

    • Poaceae (grass family)


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Sexual incompatibility

  • Examples in the rosaceae include:

    • Apples

    • Cherries

    • Plums


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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


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Sexual incompatibility

Germination

prevented

Normal pollen

germination


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Self-pollinating fruit trees

These include:

  • Peaches

  • Apricots

  • Nectarines


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Flower types for cross-pollination

  • Dioecy (dioecious plants)

    • Example: Holly


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Flower types for cross-pollination

  • Dioecy (dioecious plants)

    • Example: Holly


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Flower types for cross-pollination

  • Monoecy (monoecious plants)

    • Example: Corn


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Flower types for cross-pollination

  • Dichogamy (monoecious plant flowering at different times)

    • Example: Squash




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Ecotype other

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

  • Ex. Pseudotsuga menziesii

    • Coastal douglas fir

    • Rocky Mountain Douglas fir




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Cline other

  • A continuous variation in a species

  • Ex. Acer rubrum (red maple)


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Provenance other

The geographic area

where a plant is

native to.


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Controlling Genetic Variability other

  • Isolation

  • Roguing

  • Pure Stands


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Controlling Genetic Variability other

  • Isolation

  • Roguing

  • Pure Stands


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Controlling Genetic Variability other

  • Isolation

  • Roguing

  • Pure Stands


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