Table 4 Functional categories of SQR9 genes that were significantly regulated by the maize root exudates

1 Cell envelope and cellular processes

 1.1 Cell wall

14

39

 1.2 Transport/binding proteins and lipoproteins

80

75

 1.3 Sensors (signal transduction)

4

14

 1.4 Membrane bioenergetics (electron transport chain and ATP synthase)

13

23

 1.5 Mobility and chemotaxis

18

49

 1.6 Protein secretion

1

9

 1.7 Cell division

2

19

 1.8 Sporulation

47

44

 1.9 Germination

6

2

 1.10 Transformation/competence

1

2 Intermediary metabolism

 2.1 Metabolism of carbohydrates and related molecules

  2.1.1 Specific pathway

52

41

  2.1.2 Main glycolytic pathways

2

7

  2.1.3 TCA cycle

1

8

 2.2 Metabolism of amino acids and related molecules

43

41

 2.3 Metabolism of nucleotides and nucleic acids

17

30

 2.4 Metabolism of lipids

20

28

 2.5 Metabolism of coenzymes and prosthetic groups

24

51

 2.6 Metabolism of phosphate

2

1

 2.7 Metabolism of sulfur

2

2

3 Information pathways

 3.1 DNA replication

1

12

 3.2 DNA restriction/modification and repair

2

19

 3.3 DNA recombination

8

 3.4 DNA packaging and segregation

4

 3.5 RNA synthesis

25

66

 3.6 RNA modification

18

 3.7 Protein synthesis

2

51

 3.8 Protein modification

2

15

 3.9 Protein folding

2

1

4 Other functions

 4.1 Adaptation to atypical conditions

18

25

 4.2 Detoxification

18

25

 4.3 Antibiotic production

6

10

 4.4 Phage-related functions

15

15

 4.6 Miscellaneous

4

5

Total (with known function)

443

758

5 Proteins of unknown function that are similar to other proteins

 5.1 From Bacillus

119

154

 5.2 From other organisms

32

53

6 No similarity

49

59

Total

643

1024