Vernalization
/ˌvɝnələˈzeɪʃən/
Definition
Vernalization is a plant physiological process in which exposure to a period of low temperatures triggers or speeds the ability to flower later. It occurs in many biennials, winter annuals, and some cereals, often after seeds, seedlings, or shoot tips experience winter-like cold. Unlike cold stratification, which helps break seed dormancy, vernalization changes the plant’s flowering response so growth can shift from vegetative to reproductive.
Biological Role
- Flowering timing: In many biennials and winter annuals, vernalization shifts the plant from vegetative growth to flowering readiness, helping bloom and seed set happen in the right season.
- Cold sensing in the shoot tip: The response is commonly linked to the shoot apical meristem, the growing tip where leaves and flowers form, after it experiences a suitable period of low temperature.
- Crop and garden examples: Several cereals, including winter wheat, as well as some cabbages, beets, and other biennial crops, depend on vernalization before they can bolt, meaning send up a flowering stem.
- Practical value for growers: Knowing whether a species needs vernalization helps with sowing schedules, overwintering plans, and avoiding unwanted bolting in vegetables grown mainly for leaves or roots.
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