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Chapter 5

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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  1. Chapter 5 Seed Selection

  2. Self-pollination • Fixed traits (homozygous) = “inbred”

  3. Self-Pollination Inbred 1x Inbred 2x Non-inbred

  4. Cross-pollination • Fixed traits (homozygous) = “inbred”

  5. Controlled crosses

  6. Controlled crosses

  7. Controlled crosses

  8. Cross-Pollination& hybrid vigor B73 B73 x Mo17 Mo17

  9. Cross-Pollination& hybrid vigor B73 Mo17 B73 x Mo17

  10. Avoiding self-pollination • Pollen sterility - genetically engineered Cytoplasmic Male Sterility

  11. Avoiding self-pollination • Pollen sterility - genetically engineered Cytoplasmic Male Sterility

  12. Avoiding self-pollination • Pollen sterility - genetically engineered Cytoplasmic Male Sterility

  13. Avoiding self-pollination • Pollen sterility - genetically engineered Cytoplasmic Male Sterility

  14. Sexual incompatibility

  15. Sexual incompatibility • Often found in the following plant families: • Solanaceae (nightshade family) • Rosaceae (rose family) • Scrophulariaceae (snapdragon family) • Fabaceae (bean family) • Poaceae (grass family)

  16. Sexual incompatibility • Examples in the rosaceae include: • Apples • Cherries • Plums

  17. 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

  18. Sexual incompatibility Germination prevented Normal pollen germination

  19. Self-pollinating fruit trees These include: • Peaches • Apricots • Nectarines

  20. Flower types for cross-pollination • Dioecy (dioecious plants) • Example: Holly

  21. Flower types for cross-pollination • Dioecy (dioecious plants) • Example: Holly

  22. Flower types for cross-pollination • Monoecy (monoecious plants) • Example: Corn

  23. Flower types for cross-pollination • Dichogamy (monoecious plant flowering at different times) • Example: Squash

  24. Male flower appears a few days earlier than female flower

  25. Flower reproductive parts can be located away from each other

  26. Ecotype • A plant that has evolved in relation to its surrounding habitat • Ex. Pseudotsuga menziesii • Coastal douglas fir • Rocky Mountain Douglas fir

  27. Coastal Douglas fir

  28. Rocky Mountain Douglas fir

  29. Cline • A continuous variation in a species • Ex. Acer rubrum (red maple)

  30. Provenance The geographic area where a plant is native to.

  31. Controlling Genetic Variability • Isolation • Roguing • Pure Stands

  32. Controlling Genetic Variability • Isolation • Roguing • Pure Stands

  33. Controlling Genetic Variability • Isolation • Roguing • Pure Stands

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