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Table 6 qPCR descriptive statistics of the candidate reference genes in cowpea under root dehydration and salt stress (NaCl, 100 mM), measured by BestKeeper software

From: Cowpea and abiotic stresses: identification of reference genes for transcriptional profiling by qPCR

Abiotic stress

Candidate reference gene

Rank

Pairwise correlation (PC) coefficient

Min

Max

SD

PC coefficient

p value

GM

AM

min

max

SD

CV

[x-fold]

[x-fold]

[± x-fold]

[r]

Salt stress

UNK

1

19.91

19.93

18.60

22.10

0.64

3.24

− 2.47

4.50

1.58

0.982

0.001

β-TUB

2

19.81

19.85

18.00

23.40

1.00

5.03

− 3.60

12.71

2.03

0.979

0.001

FBOX

3

21.59

21.61

20.10

24.10

0.68

3.13

− 2.85

5.84

1.62

0.975

0.001

UE21D

4

18.40

18.42

17.00

20.70

0.60

3.24

− 2.65

4.99

1.52

0.975

0.001

VuUBQ10

5

15.55

15.58

13.80

18.00

0.78

5.03

− 3.27

5.28

1.74

0.920

0.001

VuACT

6

20.41

20.43

18.70

23.00

0.66

3.23

− 3.44

6.50

1.59

0.915

0.001

EF1-α*

7

16.58

16.68

14.40

22.80

1.36

8.16

− 4.43

70.08

2.62

0.948

0.001

Root dehydration

β-TUB

1

19.93

19.95

18.60

21.30

0.55

2.76

− 2.57

2.63

1.48

0.958

0.001

UNK

2

20.35

20.37

19.30

22.20

0.60

2.95

− 2.07

3.56

1.53

0.925

0.001

VuACT

3

21.74

21.75

20.60

23.50

0.53

2.45

− 2.28

3.56

1.46

0.910

0.001

UE21D

4

19.04

19.05

18.07

20.40

0.51

2.65

− 1.97

2.59

1.43

0.875

0.001

FBOX

5

22.16

22.17

21.20

23.70

0.56

2.52

− 1.96

2.96

1.48

0.870

0.001

VuUBQ10

6

16.57

16.58

15.80

17.90

0.45

2.70

− 1.68

2.47

1.37

0.816

0.001

EF1-α

7

16.84

16.85

15.80

18.50

0.47

2.78

− 2.03

3.11

1.39

0.475

0.019

  1. Vu (Vigna unguiculata); UNK (Phaseolus vulgaris unknown gene); β-TUB (beta-tubulin); FBOX (F-box protein); UE21D (ubiquitin-conjugating enzyme E2 variant 1D); VuUBQ10 (polyubiquitin 10); VuACT (actin); EF1-α (elongation Factor 1-alfa); GM: the geometric mean of PC; AM: the arithmetic mean of PC; Min PC and Max PC: the extreme values of PC; SD: the standard deviation of the PC; CV: the coefficient of variance expressed as a percentage of the PC level; Min [x-fold] and Max [x-fold]: the extreme values of expression levels expressed as an absolute x-fold over- or under-regulation coefficient; SD [± x-fold]: standard deviation of the absolute regulation coefficient; [r]: Pearson correlation coefficient
  2. *Inconsistent data: SD > 1 [11]