Golden Rice Color Origin

Transgenic golden rice is genetically engineered to produce specific compounds. Its characteristic golden-yellow hue is primarily due to the accumulation of a pigment called $\beta$-carotene.

Mechanism of Color Production

Golden rice varieties are modified to express genes that enable the rice endosperm to synthesize $\beta$-carotene, a precursor to Vitamin A. This metabolic pathway is normally absent in the endosperm of regular rice.

• The insertion of specific genes activates the necessary enzymes for $\beta$-carotene synthesis.
• $\beta$-carotene is a carotenoid pigment responsible for the yellow, orange, and red colors in many plants.
• In golden rice, this pigment accumulates in the endosperm, giving it the distinctive golden color.

Therefore, the distinct golden colour in transgenic golden rice is directly attributed to the presence and accumulation of $\beta$-carotene.