Biochemical reaction

Isolates

Gram’s reaction

Starch Hydrolysis

Oxidase test

Catalase test

Aspargine medium

Xanthomonadin
pigment

1

-

+

+

+

+

-

2*

-

+

+

+

-a

+b

3*

-

+

+

+

-a

+b

4*

-

+

+

+

-a

+b

5*

-

+

+

+

-a

+b

6

-

+

+

+

+

-

7

-

+

+

+

+

-

8

-

+

+

+

+

-

9

-

+

+

+

+

-

10*

-

+

+

+

-a

+b

11

-

+

+

+

+

-

12

-

+

+

+

+

-

13

-

+

+

+

+

-

14*

-

+

+

+

-a

+b

15

-

+

+

+

+

-

16

-

+

+

+

+

-

17

-

+

+

+

+

-

18

-

+

+

+

+

-

19

-

+

+

+

+

-

20*

-

+

+

+

-a

+b

21

-

+

+

+

+

-

22

-

+

+

+

+

-

23

-

+

+

+

+

-

24

-

+

+

+

+

-

25*

-

+

+

+

-a

+b

26

-

+

+

+

+

-

27

-

+

+

+

+

-

28*

-

+

+

+

-a

+b

29

-

+

+

+

+

-

30

-

+

+

+

+

-

31

-

+

+

+

+

-

32

-

+

+

+

+

-

33*

-

+

+

+

-a

+b

34

-

+

+

+

+

-

35

-

+

+

+

+

-

36

-

+

+

+

+

-

‘+’ indicates positive reaction; ‘-‘ indicates negative reaction: -a indicates isolates failed to grow on Asparagine medium; -b indicates presence of xanthomonadin pigment. ‘*’ indicates typical X. campestris pv. campestris characteristics
Table 3: Identification of isolates X. campestris pv. campestris according to biochemical characteristics.