Scientists Engineer First True Blue Roses Using Dual-Pigment System
True blue roses have long been considered impossible to produce through traditional breeding, as rose petals lack the genetic machinery to synthesize blue pigments. Now, a team of scientists has achieved this feat by engineering roses to produce not just one blue compound, but two components that work together.
The researchers introduced genes that enabled the rose petals to synthesize a blue pigment directly. However, the color alone was not sufficient to achieve a true blue hue. The scientists also engineered the roses to produce a colorless "copigment" molecule—a compound that helps stabilize and intensify the visible blue color by preventing the pigment from breaking down or appearing muddy.
This dual-component approach mimics how some other flowers, such as certain blue hydrangeas, achieve their blue coloration in nature. In those plants, copigments bind to anthocyanin pigments and shift their color toward blue by altering the pH and molecular structure within the petal cells.
The resulting engineered roses displayed a stable blue coloration that had not been possible with previous attempts, which typically relied on dyeing white roses or modifying single genes with limited success. The research represents a significant advance in understanding how flower colors can be rationally designed through synthetic biology approaches.