What physiological event, signaled by cold temperatures after the juvenile stage, prepares a cabbage plant for flowering?

Answer

Vernalization

Vernalization is a specific physiological process in biennials like cabbage that links cold exposure to the subsequent initiation of reproduction. If temperatures drop sufficiently low after the plant has reached a specific juvenile size—defined as having a stem diameter of about 6 mm—this cold period signals the plant to prepare for flowering during the following season. This mechanism allows growers in regions experiencing cool seasons, such as parts of the eastern US, to plant without immediately triggering the plant to produce seed stalks.

What physiological event, signaled by cold temperatures after the juvenile stage, prepares a cabbage plant for flowering?
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