The detector of light during de-etiolation (greening) of a tomato plant is ________.

Question

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Phytochrome is a pigment that is responsible for detecting light during the process of de-etiolation or greening of a plant. It exists in two forms, Pr and Pfr, and undergoes a reversible transformation between the two forms upon absorbing light. This transformation is involved in many important plant processes such as seed germination, shade avoidance, and circadian rhythms. Other pigments such as carotenoids, xanthophylls, and chlorophylls are also involved in the light-harvesting process, but not specifically in the detection of light during de-etiolation. Auxin is a plant hormone that regulates many aspects of plant growth and development, but is not directly involved in the greening process.

The Detector of Light During De-Etiolation (Greening) of a Tomato