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Lec05 - From Seed to Tree I.doc


Department
Biological Sciences
Course Code
BIOA02H3
Professor
Mary Olaveson

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From Seed to Tree
Slide One
Seed to germination
oSeed dispersal
oSeed anatomy
oGermination
From primary to secondary plant body
Body plans of major angiosperm groups
Slide Two
Parent generation wants the filial generation to be as far away as possible
oFor obvious reasons such as to prevent competition for nutrients
Slide Three – problem
Without seed dispersal adaptations, most seeds are deposited close to mother
plant
Parent-offspring competition for space
Mating between closely related individuals:
oInbreeding depression
Slide Four / Seventeen – seed dispersal
Plants need vectors to move the seeds away
oWind dispersal
Abiotic
Light seeds primed for wind
Hairs
Parachutes
Winged maples prolong their fall to the ground to allow wind to
carry it away

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oWater dispersal
Abiotic
AKA hydrochory
Coconut
oSelf-dispersion
Abiotic
AKA autochory
Jewelweed
When seed pods are ripe and touched, it catapults away
the seeds
oGravity dispersal
Barochory
Picked up by small mammals because it is rich in oils and starch
(nutrition)
Seed caching
Some caches are forgotten and germinate into trees etc
oLiving organisms
Internal hitchhiking
Endozoochory
Fruits change color to represent ripeness and readiness to
be dispersed (eaten)
External hitchhiking
Biotic
Ant dispersal
oMyrmecochory (myrmeco = ant)
oPlants attach a food body to the ant (elaiosome)
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