MADISON, Wisconsin, Jan. 10 -- The University of Wisconsin Madison campus issued the following news: Photoreceptors help seedlings detect when they have reached ample sunlight, when to stop elongating their stems and when to begin photosynthesis to produce energy. Photo by ArtRachen01/iStock University of Wisconsin-Madison researchers have discovered where an important photoreceptor acts within plant stems, and the finding could help growers improve the success rate of crops like soybeans. Pu  more