Question

What is a plant pigment responsible for photoperiodism?

Answer 1

Photoperiodism:

1. Photoperiodism is the response of the plants to the relative lengths of light and dark periods.
2. The pigment involved in photoperiodism is phytochrome.
3. Phytochrome detects the presence or absence of light and is involved in regulating seed germination and initiation of flowering.
4. It is a chromoprotein that consists of a light detecting portion called chromophore which exists in two states: P₆₀₀ (P_r) and P₇₃₀ (P_fr).