Classic Experiments Suggested That a Floral Stimulus, Florigen, Could Move

Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a non-induced plant and trigger flowering. Recent evidence using Arabidopsis has 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 Ca2+ to change membrane potential.

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