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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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slide1

Chapter 5

Seed Selection

self pollination
Self-pollination
  • Fixed traits (homozygous) = “inbred”
self pollination3
Self-Pollination

Inbred

1x

Inbred

2x

Non-inbred

cross pollination
Cross-pollination
  • Fixed traits (homozygous) = “inbred”
avoiding self pollination
Avoiding self-pollination
  • Pollen sterility - genetically engineered

Cytoplasmic

Male Sterility

avoiding self pollination11
Avoiding self-pollination
  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility

avoiding self pollination12
Avoiding self-pollination
  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility

avoiding self pollination13
Avoiding self-pollination
  • Pollen sterility - genetically engineered

Cytoplasmic Male Sterility

sexual incompatibility15
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 incompatibility16
Sexual incompatibility
  • Examples in the rosaceae include:
    • Apples
    • Cherries
    • Plums
sexual incompatibility17
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 incompatibility18
Sexual incompatibility

Germination

prevented

Normal pollen

germination

self pollinating fruit trees
Self-pollinating fruit trees

These include:

  • Peaches
  • Apricots
  • Nectarines
flower types for cross pollination
Flower types for cross-pollination
  • Dioecy (dioecious plants)
    • Example: Holly
flower types for cross pollination24
Flower types for cross-pollination
  • Dioecy (dioecious plants)
    • Example: Holly
flower types for cross pollination25
Flower types for cross-pollination
  • Monoecy (monoecious plants)
    • Example: Corn
flower types for cross pollination26
Flower types for cross-pollination
  • Dichogamy (monoecious plant flowering at different times)
    • Example: Squash
ecotype
Ecotype
  • A plant that has evolved in relation to its surrounding habitat
  • Ex. Pseudotsuga menziesii
    • Coastal douglas fir
    • Rocky Mountain Douglas fir
cline
Cline
  • A continuous variation in a species
  • Ex. Acer rubrum (red maple)
provenance
Provenance

The geographic area

where a plant is

native to.

controlling genetic variability
Controlling Genetic Variability
  • Isolation
  • Roguing
  • Pure Stands
controlling genetic variability35
Controlling Genetic Variability
  • Isolation
  • Roguing
  • Pure Stands
controlling genetic variability36
Controlling Genetic Variability
  • Isolation
  • Roguing
  • Pure Stands