The 2-D gels stained by Coomassie brilliant blue (CBB) R250 [containing 50% (v/v) of methanol, 15% (v/v) of acetic acid and 0.1% (w/v) of CBB-R250] were scanned using an EPSON PERFECTION V700 PHOTO scanner (Epson), and protein spots of 2-D gel with dierent abundance changes were analyzed using PDQuest 2-DE Analysis Software (BIO-RAD, USA). The protein spots (fold change ≥2) were used for trypsin digestion and MALDI-TOF-MS analysis with AXIMA-CFR plus (Shimadzu Biotech, Kyoto, Japan) as reported by Li et al. (2012) and Shi et al. (2013a).