The
E.
coli
expressed carrot antifreeze protein (DcAFP) was purified by preparative HPLC, refolded by dialysis, and checked by analytical HPLC and SDS-PAGE. The gradient-concentrations of DcAFP in 3% glycerol were used to cryopreserve rice single cell by vitrification at -25degC, -75degC and -180degC. The result showed that DcAFP, at optimal concentration of 0.1 mg/ml, can visibly inhibit the liquid recrystallization of thawed rice cells. DcAFP treated rice cells had higher viability even than positive control and facilitated the efficient daughter cell division. The average diameter of in...