1
2
3
4
PHOTOPERIOD/LIGHT QUALITY VERNALIZATION AUTONOMOUS HORMONES
ELF3,GI PHYB GAFLD,FVE,FCA,FY,
FPA
CO
FLC
FRI,PIE
FT
SOC1
LFY
AP1 TFL
AG
AP3
LFY
+WUS
AP3
+UFO?
VRN2,VIN3
PFT1
PHYA,
CRY2
LFY
AP1
+
2
0 1
3
Figure 2.2.1 Flowering induction and flower organ specification
A
B
C
E
AP1
AP2
AP3
PI
AG
SEP1-3
SEPALS PETALS STAMENS CARPELS
WHORL1 WHORL2 WHORL3 WHORL4
AP1
AP1
? ?
SEP
AP1
AP3
PI
SEP
AG
AP3
PI
SEP
SEP
AG
AG
Figure 2.2.2 Scheme of Arabidopsis
flower
Figure 2.2.3 ABCE model