Photoperiodism in Plants

JRF Plant Science

Photoperiodism In Plants

• Response of plant to day light period specially flowering behaviour is called photoperiodism.

• The term photoperiodism was coined by Garner and Allard (1920). They classified plants into three categories:

a. Short day plants:

• Such plants require the day length less than 12 hours for flower initiation.

• E.g. tobacco, soybean, rice, generally kharif crops and many tropical plants.

b. Long day plants:

• Such plants require more than 14 hours day light for flower initiation.

• E.g. wheat, barley, sugar beet, castor, generally Rabi crops

c. Day neutral plants:

• Such plants are unaffected by the day length e.g. maize, tomato, buckwheat, sunflower, cotton, cucumber etc.

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