Table 4. The ranking of candidate reference gene stability by three software programs during withering treatment.

Rank	GeNorm		Normfinder		BestKeeper
	Gene	Stability	Gene	Stability	Gene	SD	CV
1	CsTBP	0.047	CsPCS1	0.006	CsPPA2	0.274	1.137
2	CsPCS1	0.048	CsTBP	0.007	CsEF-1α	0.278	1.272
3	CsPPA2	0.050	CsACT	0.013	CsACT	0.283	1.469
4	CselF-4α	0.050	CselF-4α	0.014	CsTBP	0.348	1.492
5	CsACT	0.051	CsPPA2	0.016	CselF-4α	0.349	1.578
6	CsEF-1α	0.053	CsCYP	0.017	CsMON1	0.353	1.747
7	CsCYP	0.055	CsEF-1α	0.019	CsPCS1	0.475	1.975
8	CsMON1	0.056	CsGADPH	0.020	CsSAND	0.523	2.299
9	CsGADPH	0.057	CsMON1	0.024	CsCYP	0.550	2.476
10	CsUbi	0.063	CsUbi	0.029	CsGADPH	0.490	2.488
11	CsSAND	0.069	CsSAND	0.037	CsUbi	0.549	2.637
12	CsTUA	0.097	CsTUA	0.059	CsTUA	1.163	4.548
13	Cs26SrRNA	0.101	Cs26SrRNA	0.060	Cs18SrRNA	0.463	4.968
14	Cs18SrRNA	0.103	Cs18SrRNA	0.062	Cs26SrRNA	0.394	6.400
15	CsRuBP	0.123	CsRuBP	0.080	CsRuBP	1.522	7.758

Note:

SD, standard deviation; CV, coefficient variation.