Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a noninduced plant and trigger flowering

Recent evidence using Arabidopsis has recently shown that florigen is probably _____.
A) a phytochrome molecule that is activated by red light
B) a protein that is synthesized in leaves, travels to the shoot apical meristems, and initiates flowering
C) a membrane signal that travels through the symplast from leaves to buds
D) a second messenger that induces Ca++ ions to change membrane potential
E) a transcription factor that controls the activation of florigen-specific genes


Answer: B

Biology & Microbiology

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