The main photoreceptor for photoperiodism and many other light-initiated plant responses, such as germination and seedling establishment is

Florigen

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Chlorophyll

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Plastocyanin

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Phytochrome

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Solution

The correct option is D Phytochrome
Phytochrome is the green pigment that regulates the developmental process. The main photoreceptor for photoperiodism and many other light-initiated plant responses (such as germination and seedling establishment) is phytochrome. A mixture of phytochrome proteins is present in cells of all vascular plants examined so far. For example, five members of the phytochrome family, designated phyA, phyB, phyC, phyD, and phyE, occur in Arabidopsis thaliana.

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