The transient gene expression system using plant protoplasts has become widely used for highthroughput
analysis
and
functional
characterization
of
genes.
In
this
work
we
investigated
protoplast isolation and green fluorescent protein (GFP) transient transfection and their main affecting factors, such
as
mannitol
concentration
in
enzymolysis
solution,
enzymolysis
time,
and
glycol (PEG) concentration and transfection time, on ‘xintaimici’ cucumber. The results showed that when the enzyme
solution
had
1.5%
cellulase
R-10
(w/v),
0.4%
macerozyme
R-10
(w/v),
0.4
mM 2-morpholinoethanesulfonic acid, 10 mM CaCl
, 0.1% bovine serum albumin, and was at pH 5.8 with an enzymolysis time of 8 h, the protoplast yield was 6–7 × 10
2
6
/g fresh weight. Viability was about 90%. GFP was used as the reporter gene to measure protoplast transformation efficiency. When the concentration of
PEG4000
was
20%
and
transfection
time
was
20
or
30
min,
transformation
polyethylene
M
efficiency
than 50% and the green fluorescent signal could be detected in the cytoplasm, chloroplasts, and plasma membrane. We show here an efficient PEG-mediated cucumber protoplast transient expression system using GFP reporter gene, laying a technical foundation for future research in cucumber molecular biology.