Table 3. Expression stability of 10 candidate reference genes calculated by NormFinder.

Rank	Drought	Cold	Salt	ABA	GA	ETH	ALL
1	GAPCP1	GAPCP1	GAPCP1	TUA1	TUA1	GAPDH2	GAPCP1
Stability	0.025	0.015	0.089	0.071	0.075	0.048	0.028
2	EF1B	60S	TUA1	SAND	CYP	TUA1	60S
Stability	0.052	0.018	0.089	0.072	0.075	0.051	0.031
3	60S	EF1B	SAND	TUA6	GAPCP1	GAPCP1	CYP
Stability	0.069	0.060	0.237	0.109	0.096	0.135	0.032
4	SAND	GAPDH2	60S	CYP	SAND	SAND	SAND
Stability	0.074	0.076	0.284	0.159	0.103	0.149	0.065
5	CYP	CYP	EF1B	GAPCP1	60S	60S	TUA1
Stability	0.245	0.238	0.319	0.188	0.323	0.150	0.130
6	TUA1	SAND	CYP	60S	TUA6	MDH	EF1B
Stability	0.316	0.385	0.371	0.201	0.358	0.207	0.163
7	TUA6	TUA6	MDH	MDH	GAPDH2	EF1B	MDH
Stability	0.326	0.481	0.447	0.255	0.414	0.251	0.185
8	GAPDH2	TUA1	TUA6	EF1B	EF1B	CYP	TUA6
Stability	0.405	0.523	0.726	0.401	0.754	0.359	0.294
9	MDH	MDH	GAPDH2	GAPDH2	MDH	18S	GAPDH2
Stability	0.615	0.586	1.286	0.516	0.836	0.486	0.357
10	18S	18S	18S	18S	18S	TU 6	18S
Stability	0.999	1.093	1.748	1.272	0.965	0.497	0.556