Lec07 - From Tree to Seed.doc

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22 Apr 2012
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From Tree to Seed
Slide One – sex in plants
Plant sex organs
More varied than animal sex
How to avoid selfing
Sex slaves of the plant kingdom
Slide Twogeneralized flower structure
Stamen
oAnther
oFilament
Carpel
oStigma
oStyle
oOvary
Petal
Sepal
Slide Three – sepals
Protect inner flower organs before bud opens
Frequently green
Can be fused to form tube
o–i.e. either fused or individuals
Slide Four – petals
Typically colourful to attract pollinators
Can be fused to form tube
Slide Five – stamen
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Pollen producing
Anther has four pollen sacs
oOnce pollen grains are ripe the space between the pollen sac is opened
and releases pollen
Slide Six – carpel: stigma
Stigma
oSticky landing platform for pollen
oMorphology of stigma to prevent pollen from falling off once landed
Slide Seven – carpel: style
Style
oConnects stigma with ovary
Slide Eight / Nine – carpel: ovary / ovule
Ovary contains one to multiple ovules
Ovule contains egg cell
Slide Ten – generalized flower structure
Four whorls (components)
oSepals
oPetals
oStamen
oCarpel
Slide Eleven – SAM generative to reproductive organs
Leaf primordium can switch identity and turn into a flower primordium
oInstead of producing leaves it produces flowers
oOnce it makes this switch, it cant make leaves anymore
Sexual organs cannot become asexual organs anymore
Slide Twelve –
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