1. Department of Plant Sciences, University of California, Davis, California 95616
2. National and Local Joint Engineering Laboratory for Energy Plant Bio-oil Production and Application, Key Laboratory of Bio-resource and Eco-environment, Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610064, P.R. China
3. Department of Ecology and Evolution Biology, University of Colorado, Boulder, Colorado 80309-0334
4. DynaMo Center of Excellence, University of Copenhagen, DK-1871 Frederiksberg C, Denmark