1. State Key Laboratory of BioFibers and Eco-textiles Qingdao University Qingdao 266071 P. R. China
2. Center for Renewable Carbon Department of Forestry Wildlife and Fisheries University of Tennessee Institute of Agriculture Knoxville TN 37996 USA
3. Department of Chemical and Biomolecular Engineering University of Tennessee Knoxville TN 37996 USA
4. Joint Institute for Biological Science Biosciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
5. The Center for Bioenergy Innovation (CBI) Oak Ridge National Laboratory Oak Ridge TN 37831 USA