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Table 2 Experimental plan for the optimization of IAA production by the strain I69: experiment 27, 28, 29, and 30 represent central points

From: Screening and optimization of indole-3-acetic acid production by Rhizobium sp. strain using response surface methodology

N°Exp

Incubation temperature (°C)

pH

[NaCl] (g/l)

[Tryptophane] (g/l)

Incubation time (days)

[IAA] (μg/ml)

1

30

4.0

0.10

1

15

6.90

2

42

4.0

0.10

1

1

6.34

3

30

9.0

0.10

1

1

18.87

4

42

9.0

0.10

1

15

4.91

5

30

4.0

1.00

1

1

8.25

6

42

4.0

1.00

1

15

2.76

7

30

9.0

1.00

1

15

11.34

8

42

9.0

1.00

1

1

6.58

9

30

4.0

0.10

9

1

5.00

10

42

4.0

0.10

9

15

5.80

11

30

9.0

0.10

9

15

6.96

12

42

9.0

0.10

9

1

4.03

13

30

4.0

1.00

9

15

4.30

14

42

4.0

1.00

9

1

3.76

15

30

9.0

1.00

9

1

27.84

16

42

9.0

1.00

9

15

32.41

17

30

6.5

0.55

5

8

90.72

18

42

6.5

0.55

5

8

2.55

19

36

4.0

0.55

5

8

2.98

20

36

9.0

0.55

5

8

16.58

21

36

6.5

0.10

5

8

119.73

22

36

6.5

1.00

5

8

123.27

23

36

6.5

0.55

1

8

157.79

24

36

6.5

0.55

9

8

108.14

25

36

6.5

0.55

5

1

121.93

26

36

6.5

0.55

5

15

88.92

27

36

6.5

0.55

5

8

118.19

28

36

6.5

0.55

5

8

118.27

29

36

6.5

0.55

5

8

117.66

30

36

6.5

0.55

5

8

117.55