1. CAS-MPG Partner Institute for Computational Biology, SIBS, Shanghai, China 200031;
2. Institute of Plant Physiology and Ecology, SIBS, Shanghai, China 200032;
3. Institute of Genomic Biology, University of Illinois at Urbana Champaign, Illinois 61801;
4. Departments of Plant Biology and Crop Sciences, University of Illinois at Urbana Champaign, Illinois 61801
5. Photosynthesis Research Unit, USDA/ARS, Urbana, Illinois, 61801