This work was supported by European Regional Development Funding through the Welsh Government for BEACON, Grant Number 8056; the Biotechnology and Biological Sciences Research Council (BBSRC) Institute Strategic Programme Grant on Energy Grasses & Biorefining (BBS/E/W/10963A01), the BBSRC Core Strategic Programme in Resilient Crops (BB/CSP1730/1) and the Office of Science (BER) Department of Energy, Grant DE-SC0006621. Glycome profiling studies were supported by the BioEnergy Science Center (BESC), Oak Ridge National Laboratory and funded by a Grant (DE-AC05-00OR22725) from the Office of Biological and Environmental Research, Office of Science, U.S. Department of Energy. Generation of the CCRC series of monoclonal antibodies used in this work was supported by the NSF Plant Genome Program (DBI- 0421683 and IOS-0923992). We acknowledge BBSRC ‘Sparking Impact’ funding and a Society for Experimental Biology Travel Fund to enable a research visit of RC to the CCRC, University of Georgia.