Vernalization
nounPronunciation: /ˌvɜːnəlaɪˈzeɪʃən/
A physiological process where prolonged cold exposure induces flowering competence in certain plants, typically requiring weeks of temperatures below 15°C. This mechanism ensures flowering occurs after winter passage, synchronizing reproduction with favorable spring conditions.
Plain English
A period of cold exposure that prepares plants to flower when temperatures warm in spring.
Etymology & History
Usage
"Winter wheat varieties require vernalization to transition from vegetative to reproductive development after overwinter dormancy."
Style guide notes: Distinguish between vernalization requirement (obligate) and vernalization response (facultative) in technical contexts.
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Related Terms
Frequently Asked Questions
What temperature range defines vernalization?
Typically 0–15°C for weeks to months, depending on species and genotype requirements for flowering competence.
Which crops require vernalization for grain production?
Winter wheat, winter barley, winter rye, and biennial crops like sugar beets and cabbage require cold exposure.
Why Test Candidates on This?
Vernalization response is critical for breeding cold-climate crop varieties and predicting flowering phenology under climate change.
Required skill level: Mid