Charlotte HartleyWith their dazzling metallic hue, the blue fruits of the laurustinus shrub (Viburnum tinus), a flowering plant popular in gardens across Europe, are a sight to behold.
But it’s what lies beneath the surface that’s caught the attention of scientists in a new study.Researchers viewed samples of the fruit tissue through an electron microscope to examine their internal structure.
They found no blue pigment as is typical in other blue fruits such as blueberries—just layers and layers of blobs. These blobs turned out to be tiny droplets of fat, arranged in a manner that reflects blue light—a phenomenon known as “structural color”—the team reports today in Current Biology.Below the fat droplets lies another layer of dark red.