Identification of differentially expressed proteins in leaves of maize treated with 5 µmol/L KH2PO4 and 1,000µmol/L KH2PO4 for 25 days.

a: Assigned spot numbers, as indicated in Figure 2.b: Names of proteins identified by MALDI-TOF/MS.c: Plant species containing the matching peptides.d: Database accession numbers from NCBI nr.e: Theoretical pI of the identified proteins. Theoretical values were retrieved from the protein database.f: Experimental pI of the identified proteins. The experimental values were calculated using PDQuest Software (Version 7.2).g: Theoretical masses (kDa) of the identified proteins. Theoretical values were retrieved from the protein database.h: Experimental masses (kDa) of the identified proteins. The experimental values were calculated using PDQuest Software (Version 7.2).i: Amino acid sequence coverage for the identified proteins.k: Mascot score obtained after searching against the NCBI nr database.m: Specificity indicates the ratio of accumulation of a particular protein from shoots of maize plants under +P versus -P conditions.n: Number of peptides identified for predicted protein.