Question

Low temperature treatment to speed up the process of flowering is referred to as

• A. Photoperiodism
• B. Vernalisation
• C. Thermoperiodism
• D. Hydroponics

Answer 1

Answer: (B)

Vernalisation

Vernalisation is the process of shortening of the juvenile or vegetative phase and hastening flowering by a previous cold treatment. In vernalization by cold treatment, winter varieties are transferred into spring or summer varieties. The site of vernalization is apical meristem or all the meristematic cells e.g., shoot tip, embryo tips, root apex etc. The low temperature required for vernalization is usually $0^o-5^{o}C$. As a result of vernalization, a flowering hormone called vernalin is formed (reported by Melchers), but vernalin has never been isolated.

So the correct option is 'vernalization'.