1. Instituto de Recursos Naturales y Agrobiologı́a de Sevilla (IRNAS), CSIC, Av. Reina Mercedes, 10, 41012 Seville, Spain
2. Forest Service, Southern Research Station, USDA, 521 Devall Drive, Auburn, Alabama 36849, United States
3. Department of Energy Great Lakes Bioenergy Research Center, Wisconsin Energy Institute, University of Wisconsin, 1552 University Avenue, Madison, Wisconsin 53726, United States
4. Department of Biochemistry, University of Wisconsin, 433 Babcock Drive, Madison, Wisconsin 53706, United States