Which is the anti-gibberellin factor?

Anti gibberellin factor is any substance that has the opposite effect of the Gibberellin hormone. It is usually a growth-inhibiting factor that causes dormancy and abscission.
Cycocel is the anti-gibberellin factor. It is a chemical substance that acts as an anti-gibberellin thus it inhibits plant growth. It causes the growth of a thick and short stem. It is also known as dwarfing agent.