Table 2 Numbers and distributions of genes associated with different types of secretion systems in mesorhizobial genomes

Type I

  AprD

4

3

2

2

2

3

  AprE

4

3

1

2

2

3

  TolC

2

1

1

2

2

2

Type II

  GSP (general secretion pathway)

11

8

11

  Sec pathway

7

7

7

7

7

7

Type III

  Rhc pili

22

22

Type IV

  F-type (Vir)

10

10

9

12

12

11

  F-type (Trb)

19

10

7

9

16

  P-type (Flp and attachment)

16

16

15

16

16

16

Type V

  Autotransporter

1

1

1

1

1

1

Type VI

26

18

18

18

TAT (twin arginine)

3

3

3

3

3

3

SRP

5

5

5

5

5

5

Mechanosensitive channels

1

1

1

1

1

1

Total

101

120

81

87

60

68