To prove that CSCNT-cellulase can function as a DNA delivery agent for plant
cells, we used a plasmid containing green fluorescent protein (GFP) gene. The optimal
ratio for DNA/CSCNT-cellulase was 1/7.5 (w/w). Transient GFP expression
could be observed 48 h after A. thaliana cells were incubated with DNA-adsorbed
CSCNT-cellulase (Fig.4). Standard polyethylene glycol (PEG)-mediated protoplast
transformation can achieve 40-90% transient transformation efficiency using 1-2 mg
of DNA per 106 cells. Here, transient transformation of 6% of cells could be
achieved when 105 cells were incubated with more than 1,000 times less DNA, that
is, 750 ng DNA (coated on 10