Lec08 - From Tree to Seed II.doc

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22 Apr 2012
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From Tree to Seed II
Slide One / Six – recap
Slide Sevenself incompatibility
Biochemical interaction
Slide Eight
No fertilization with own pollen
oPresent in
Apple trees
Pear trees
Cherry trees
Early stage recognition
oBiochemical self recognition that hinders germination of pollen grains on
its own stigma
oStigma recognition
Mid stage recognition
oStyle recognition
oPollen tube is plugged to prevent fertilization
Late stage recognition
oOvary recognition
oFertilization stopped before it reaches ovule
Slide Nine – sex slaves of the plant kingdom
Slide Ten – needed: pollen vector
Slide Eleven – flowers
Ingenious solution of angiosperms
oNon directed and directed mobility of pollen to seek egg
oNon directed
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Abiotic
i.e. wind
oDirected
Biotic
i.e. bees
Today: extreme diversity in the types of flowers
o invention of flowers:
Triggered largest diversity of plants ever
Slide Twelve – parallel insect and angiosperm radiation
Coevolution of plants and insects
Slide Thirteen – forces behind the evolution of flowers
Main forces
oAssurance of seed set
Mechanics bring female and male gametes together to replace
the parents (survivability)
oInbreeding avoidance
Creation of high quality offspring
Slide Fourteen – pollination syndromes
Pollination syndromes are characteristics that evolved in response to a
pollinator
Specialization
oOf floral architecture to optimize pollen uptake and deposition
oOn senses of pollinators for precise attraction (sight / smell / touch)
oOn food requirements of pollinators (fitting reward)
o shape / color / odor / reward
Cater towards who is pollinating them
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