1. Department of Biology, East Carolina University, Greenville, North Carolina 27858, Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, Department of Plant Biology, Louisiana State University, Baton Rouge, Louisiana 70803, Photosynthesis Research Unit, USDA/ARS, Department of Plant Biology, University of Illinois, Urbana, Illinois 61201, and Department of Microbiology, Louisiana State University, Baton Rouge, Louisiana 70803