BOTANY Higher Secondary Second Year - Textbooks Online

The response to the cold temperature stimulus is not uniform in all
plants. Plants, which are vernalized, are called inductive types. Those
nonvernalized are called noninductive types.
Techniques of vernalization
The following are the steps to be taken to induce vernalization. Seeds
are allowed to germinate and subjected to cold treatment for varying
period of time depending on the species. Germinated seeds after this
treatment are allowed to dry for sometime and then sown.
Devernalization
Reversal of the effect of vernalization is called Devernalization.
Subjecting the plants to higher temperature after a cold treatment brings
about devernalization.
Practical application of vernalization
Russian scientists have used vernalization to shorten the time of crop
maturity by hastening the flowering processes which are brought about by
cold treatment.
Advantages
Crops can be produced earlier by vernalization. They can be cultivated
in places where they naturally do not grow. Vernalization helps to accelerate
the plant breeding.
Self evaluation
I . Choose and write the correct options.
1. The response of a plant to the relative lengths of light and dark
periods is known as
a. vernalization b. photorespiration
c. photosynthesis d. photoperiodism
2. Photoperiodic response in flowering was first observed in
a. wheat b. Maryland Mammoth
c. Oats d. Chrysanthemum
3. Which of the following is a short day plant?
a. wheat b. tobacco
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