1. A hypothetical plant hormone or signal that promotes flowering in response to environmental conditions such as day length or temperature.
Usage: biology; botany; technical

Examples

• Scientists have long searched for florigen, the mysterious substance that triggers flowering in plants.
• The discovery of florigen-like proteins has advanced our understanding of how plants sense seasonal changes.
• Researchers believe florigen is produced in the leaves and transported to the shoot apex to initiate flowering.
• The concept of florigen dates back decades, though its exact molecular identity remained elusive for many years.
• Modern genetic studies have identified candidate genes for florigen in model plants like Arabidopsis.