Proteomic analysis identified a polypeptide sequence, VIMEEIGPR, encoded by GPAT gene (Fig. 4A). Since GPAT catalyzes the first step of TAG biosynthesis pathway by KEGG analysis, thus GPAT was chosen to be the target gene for further study. The protein expression profile based on proteomics revealed that GPAT was highly expressed in the 0 h and 72 h PG samples, compared with the expressed level of GPAT at −72 h PG samples (Fig. 4B). Further qPCR results manifested that GPAT was highly expressed in the 0 h and 72 h PG samples, compared with the expressed level of GPAT at −72 h PG samples (Fig. 4C).