Investigations on the specific effects of blue light on plants began some fifty years ago. In re cent years the growing awareness of blue-light-in- duced phenomena in plants, microorganisms, and animals has accelerat- ed and expanded this research into an ever-increasing variety of blue- light effects in biological systems. In 1977, J .A. Schiff and W .R. Briggs proposed a specific meeting to present and summarize the various blue-light effects and...