According to the ABCDE model of flower development, different combinations of MADS-box proteins from classes A, B, C, D, and E form tetrameric structures known as floral quartets. These quartets bind to DNA to activate transcription and specify floral organ identity.
In the given diagram, the proteins are represented as follows:
- AP1 = APETALA 1
- AP3 = APETALA 3
- PI = PISTILLATA
- AG = AGAMOUS
- SHP = SHATTERPROOF
- STK = SEEDSTICK
- SEP = SEPALLATA
Which one of the following options represents the correct floral quartets that specify sepals and stamen whorls of a flower, respectively?
1
A and C
2
B and E
3
C and D
4
B and C