Classification and functional analysis of the identified 35 DEPs. To evaluate the quality of identified proteins, the theoretical and experimental ratios of molecular mass (Mr) and isoelectric point (pI) were determined and presented in radial chart as radial and annular radar axis labels respectively (A). Then, the distributions of the identified proteins in different plant species were also presented (B). Each protein was functionally classified by COG (C). The proportion of each functional category was the sum of the proportion of all identities. The subcellular locations of the identified 35 proteins were presented (D). The abbreviations were: G, carbohydrate transport and metabolism; O, Posttranslational modification, protein turnover, chaperones; C, energy production and conversion; D, Cell division and chromosome partitioning; E, Amino acid transport and metabolism; H, Coenzyme transport and metabolism; P, Inorganic ion transport and metabolism; M, Cell envelope biogenesis, outer membrane; F, Nucleotide transport and metabolism; NO, No related COG.