Table 1.

Candidate reference genes ranked by geNorm. α-EF: α-Elongation factor; His: Histone; UBC: Ubiquitin conjugating enzyme; 18S: 18S rRNA; GAPDH: Glyceraldehyde 3-phosphate dehydrogenase.

Ranking	All samples		Samples of wounded stems at different times		Samples of different organs
	Candidate reference genes	Stablity value	Candidate reference genes	Stablity value	Candidate reference genes	Stablity value
1	Actin	0.474	Actin	0.223	α-EF	0.197
2	β-tubulin	0.474	β-tubulin	0.223	18S	0.197
3	α-EF	0.553	His	0.389	β-tubulin	0.373
4	18S	0.620	UBC	0.469	Actin	0.465
5	UBC	0.689	α-EF	0.531	UBC	0.609
6	His	0.774	GAPDH	0.592	His	0.831
7	GAPDH	1.063	18S	0.677	GAPDH	1.311