Table 4.

The expression stability of candidate reference genes under cold stress.

Rank	geNorm		NormFinder		deltaCt		Bestkeeper
	Gene	SV	Gene	SV	Gene	SV	Gene	SV
1	miR160e	0.258	U6 snRNA	0.007	U6 snRNA	1.071	U6 snRNA	0.106
2	miR168	0.258	ACT	0.011	miR168	1.169	miR168	0.259
3	U6 snRNA	0.363	miR160e	0.021	ACT	1.208	EF1	0.396
4	EF1	0.593	miR168	0.021	miR160e	1.217	miR160e	0.458
5	ACT	0.709	EF1	0.022	EF1	1.247	ACT	0.692
6	GAPDH	0.824	GAPDH	0.032	GAPDH	1.373	5.8S rRNA	0.796
7	5.8S rRNA	0.939	5.8S rRNA	0.047	5.8S rRNA	1.538	GAPDH	0.867
8	miR164a	1.164	miR164a	0.076	miR164a	2.114	miR164a	1.205
9	UBQ	1.525	UBQ	0.090	UBQ	2.789	UBQ	2.426