Table 1.

Identification of 21 proteins that differentially expressed in labellum and inner lateral petal.

Group a	Spot Number b	Protein Name	Reference Organism	Accession c	Mascot Scores	Blast Score	Blast Expect	Spots % Volume Variations (p < 0.05) d
I	173	Superoxide dismutase [Cu-Zn], chloroplastic	Oryza sativa japonica group	P93407	214	306	9 × 10−103
I	243	2-Cys peroxiredoxin BAS1, chloroplastic	Arabidopsis thaliana	Q96291	51	376	6 × 10−129
I	302	Triosephosphate isomerase (TPI)	Gossypium mexicanum	D2D303	137	424	2 × 10−147
I	411	Fibrillin-like protein (FIB)	Oncidium hybrid cultivar	B4F6G1	930	489	2 × 10−161
I	412	Oxygen-evolving enhancer protein 1-2, chloroplastic	Oryza sativa subsp. japonica	Q9S841	131	485	3 × 10−169
I	554	Guanine nucleotide-binding protein subunit beta-like protein A	Oryza sativa subsp. japonica	P49027	93	521	0
II	141	SMALLER WITH VARIABLE BRANCHES (SVB)	Arabidopsis thaliana	Q9FXB0	274	164	6 × 10−48
II	334	NAD(P)-binding Rossmann-fold-containing protein	Arabidopsis thaliana	O80934	58	424	2 × 10−144
II	393	Leucine-rich repeat extensin-like protein 3	Arabidopsis thaliana	Q9T0K5	291	53.1	4 × 10−11
II	430	Xyloglucan endotransglucosylase/hydrolase protein 22	Arabidopsis thaliana	Q38857	262	420	1 × 10−144
II	449	Mannose-specific lectin	Allium sativum	P83886	239	63.2	3 × 10−11
II	591	NADP-dependent alkenal double bond reductase P2	Arabidopsis thaliana	Q39173	65	479	2 × 10−166
II	940	NADP-dependent malic enzyme, chloroplastic (maeB)	Oryza sativa subsp. japonica	P43279	60	926	0
II	972	Putative nucleic acid binding protein	Oryza sativa subsp. japonica	Q8S7G1	134	170	3 × 10−67
II	1028	Putative elongation factor	Oryza sativa subsp. japonica	Q9ASR1	240	1524	0
II	1090	serine carboxypeptidase (SCPL)-like 18	Brachypodium distachyon	XP_003560245.1	48	440	2 × 10−144
II	1146	Proteasome subunit alpha type-7-B	Arabidopsis thaliana	O24616	181	443	3 × 10−156
II	1201	Quinone oxidoreductase-like protein At1g23740, chloroplastic	Arabidopsis thaliana	Q9ZUC1	104	489	1 × 10−166
III	1535	Cytosolic ascorbate peroxidase 1	Gossypium mexicanum	A7KIX5	242	439	4 × 10−152
III	1545	Xyloglucan endotransglucosylase/hydrolase, putative, expressed (XET/XTH)	Oryza sativa subsp. japonica	Q2R336	415	486	3 × 10−170
III	1547	Beta-glucosidase 12	Oryza sativa subsp. japonica	Q7XKV4	112	562	0

^a Group I has the proteins down-regulated in labellum, group II has the protein up-regulated in labellum, and group III has the protein specifically expressed in the labellum; ^b Numbering corresponds to the 2-DE gel in Figure 2; ^c Accession numbers from the UniProt database; ^d The X-axis represents two parts of floral organ, and 1 and 2 represent labellum and inner lateral petal, respectively, and the Y-axis denotes the relative protein expression levels (normalized volume of spots), and the values are expressed as the mean of three replicates ± the standard deviation.