Study Solves Mystery in Anthocyanin Production in Black Rice

Researchers at Kyung Hee University have identified two enzymes, OsA3GT1 and OsA3GT2, that serve as the "finishing tools" required to stabilize anthocyanin pigments in black rice. Their findings, published in the journal Rice, solve a long-standing mystery in plant biology.

While the biosynthetic pathway of anthocyanin development in grains is well-documented, the final steps of the process have remained unclear. Using CRISPR gene editing, the research team successfully defined the roles of these two enzymes. They discovered that when OsA3GT1 is deactivated, rice seeds lose both their dark pigmentation and the majority of their nutritional content. The second enzyme, OsA3GT2, performs a similar function but acts in a smaller, secondary capacity.

Together, these enzymes ensure that the plant effectively stores health-promoting compounds, such as cyanidin, within the rice bran. These insights provide a roadmap for scientists to breed new rice varieties with significantly higher antioxidant levels.

Read the research article in Rice.