Plants survive by getting access to light. And according to a new study led by Salk Institute scientists, plants can also sense subtle qualities in the spectrum of light that hits them, using that information to guide their growth.
A lack of blue light, detected by certain proteins, causes plants to activate growth-promoting genes, according to the study, published Dec. 24, 2015 in Cell. This mechanism acts along with a previously known one that reacts when light is deficient in the red portion of the spectrum, causing release of a growth hormone called auxin. –(December 2015) by Bradley Fikes in the San Diego Union Tribune.