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Table 2 Sequence diversity estimates of 16S rRNA for isolates of Azotobacter species collected from rice rhizosphere soils in Taiwan. Nucleotide diversity was calculated based on the average number of nucleotide differences per site between two sequences (Nei 1987)

From: Diversity and characterization of Azotobacter isolates obtained from rice rhizosphere soils in Taiwan

Species

Number of isolates

Number of haplotypes

Number of polymorphic sites

Nucleotide diversity

A. beijerinckii

30

8

36

9.26 × 10−3

A. chroococcum

50

7

17

2.50 × 10−3

A. tropicalis

16

4

9

0.85 × 10−3

A. vinelandii

2

2

1

0.75 × 10−3

Combined

98

21

84

1.59 × 10−2