flowering time flower meristem identity flower organ identity fruit development ft apetala1, leafy,...
TRANSCRIPT
![Page 1: Flowering Time Flower Meristem Identity Flower Organ Identity Fruit Development FT APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER) A, B, C FRUITFULL,](https://reader036.vdocuments.site/reader036/viewer/2022070307/551a51bc550346545e8b5608/html5/thumbnails/1.jpg)
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Flowering Time
Flower Meristem Identity
Flower Organ Identity
Fruit Development
FT
APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER)
A, B, C
FRUITFULL, SHATTERPROOFINDEHISCENT
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B
A C C A
B
carp
el
pet
al
pet
al
stam
en
stam
en
sep
al
sep
al
1 12 23 34
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normal flower
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sep
al
sep
al
pet
al
pet
alst
amen
stam
en
carp
elBB
A C C A
What gene prevents the B gene from beingactive in the center of flowers?
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In SUPERMAN mutants (SUP), the B activityexpands into the center of the flower and convertsthe two carpels into two stamens.
A C C A
B B
stam
en
stam
en
sep
al
sep
al
pet
al
pet
al
stam
en
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Superman mutant
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The SUPERMAN gene normally functions toprevent B gene activity in the center of flowers
A C C A
B B
stam
en
stam
en
sep
al
sep
al
pet
al
pet
al
stam
en
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normal BC mutant ??se
pal
sep
al
pet
al
pet
alst
amen
stam
en
carp
el
BB
A C C A
A A A A
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normal BC mutantse
pal
sep
al
pet
al
pet
alst
amen
stam
en
carp
el
BB
A C C A
A A A A
sep
al
sep
al
sep
al
sep
alse
pal
sep
al
*
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BC double mutant
all organsare sepals
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sep
al
sep
al
pet
al
pet
alst
amen
stam
en
carp
elBB
A C C A
What happens if the A, B and C genes are allinactivated in the ABC triple mutant?
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normal ABC mutant ??se
pal
sep
al
pet
al
pet
alst
amen
stam
en
carp
el
BB
A C C A
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ABC mutant
leaf
leaf
leaf
leaf
leaf
leaf*
normalse
pal
sep
al
pet
al
pet
alst
amen
stam
en
carp
el
BB
A C C A
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“ABC” triple mutant
all organsare leaves
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Goethe believed that floral organs are derived from leaves
Goethe, 1790
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The C gene is active in cells that will form stamens and carpels
petal
sepalcarpel
leaf
sepalstamen
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What would happen if the C gene was mis-expressedin cells that would normally form sepals?
petal
sepalcarpel
leaf
sepalstamen
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B
normal
stam
en
stam
en
carp
el
sep
al
sep
al
B
A C C A
pet
al
pet
al
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Regulatory regionstamens and carpels
C GENECoding Region
sepalsAdd sepal regulatory region:
Remove regulatory region:
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Flowering Time
Flower Meristem Identity
Flower Organ Identity
Fruit Development
FT
APETALA1, LEAFY, CAULIFLOWER, (TERMINAL FLOWER)
A, B, C
FRUITFULL, SHATTERPROOFINDEHISCENT