Classic Experiments Suggested That a Floral Stimulus Florigen Could Move

question 36

Multiple Choice

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 and travels to the shoot apical meristem 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.

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