Table 2. Ranking and expression stability values of the candidate reference genes calculated by NormFinder.

Rank	TS		SG		ST		TT
	Gene	Stability value	Gene	Stability value	Gene	Stability value	Gene	Stability value
1	EF1-α	0.090	ACT2	0.048	ACT2	0.141	TUB-β	0.246
2	TUB-β	0.248	TUB-β	0.048	ACT7	0.179	ACT2	0.332
3	ACT2	0.323	TUB-α	0.190	EF1-α	0.194	CYP1	0.346
4	CYP1	0.371	EF1-α	0.205	TUB	0.195	EF1-α	0.398
5	ACT7	0.462	CYP1	0.251	CYP1	0.205	TUB-α	0.445
6	UBC2	0.521	GSA	0.304	TUA	0.247	SAND	0.453
7	GSA	0.620	GAPDH	0.308	GSA	0.262	ACT7	0.511
8	PP2A	0.644	PP2A	0.325	PKS1	0.311	UBC2	0.532
9	GAPDH	0.653	SAND	0.337	SAND	0.335	PKS1	0.562
10	PKS1	0.663	UBC2	0.487	UBC2	0.341	PP2A	0.586
11	SAND	0.687	RPL13	0.491	RPL13	0.353	RPL13	0.594
12	TUB-α	0.710	ACT7	0.540	GAPDH	0.375	GSA	0.602
13	RPL13	0.789	PKS1	0.771	PP2A	0.401	GAPDH	0.668
14	ACT3	0.934	ACT3	1.297	ACT3	0.462	ACT3	0.688

Note:

(TS) Different tissues, (SG) developmental stage seedlings, (ST) stress-treated seedlings, and (TT) data from all experimental conditions combined.