Genetic Variability of Aspergillus flavus Isolates from a Mississippi Corn Field
Table 2
omtA gene polymorphism statistics for Aspergillus flavus from a single Mississippi field.
Season/Source/Year
Sequence and haplotype
Nucleotide diversity
Population expansion
Hd ± sd
May–Oct./soil/2006
8
28
4
0.64 ± 0.18
0.020
12.17
0.018
10.79
0.96
0.99
4.86
0.05
0.67
May–Oct./soil/2007
10
26
4
0.53 ± 0.18
0.014
8.77
0.015
9.19
1.11
0.88
5.02
0.03
−0.21
May–Oct./soil/2008
8
39
5
0.78 ± 0.15
0.023
14.25
0.025
15.42
0.15
0.02
3.32
0.16
−0.40
May–Oct./above ground/2006
9
28
5
0.86 ± 0.08
0.022
13.27
0.017
10.30
1.32
1.51
3.92
0.09
1.44
May–Oct./above ground/2008
10
32
5
0.66 ± 0.16
0.011
6.88
0.020
12.01
−2.36*
−2.58*
2.45
0.23
−2.05*
Jan.–April/soil/2006
15
28
5
0.59 ± 0.14
0.015
9.27
0.014
8.80
0.92
0.84
5.34
0.02
0.22
Jan.–April/soil/2007
23
26
4
0.52 ± 0.09
0.016
9.84
0.011
7.04
1.20
1.51
11.4
0.00
1.49
Jan.–April/soil/2008
17
24
2
0.22 ± 0.12
0.008
5.29
0.011
7.09
1.59*
0.98
10.3
0.00
−1.02
Jan.–April/soil/2009
5
25
3
0.80 ± 0.16
0.024
14.80
0.020
12.00
1.73*
1.86*
4.74
0.09
1.73
Jan.–April/plant debris/2006
5
23
2
0.40 ± 0.23
0.015
9.20
0.018
11.04
−1.23*
−1.32
6.64
0.02
−1.23
Jan.–April/plant debris/2007
4
23
3
0.83 ± 0.22
0.001
1.00
0.001
1.09
−0.70
−0.60
−0.88
0.95
−0.70
Jan.–April/plant debris/2008
4
23
2
0.66 ± 0.20
0.025
15.33
0.021
12.54
2.28*
2.38*
6.76
0.03
2.28*
Combined
118
68
24
0.61 ± 0.04
0.018
11.08
0.023
13.94
−4.07*
−3.13*
1.83
0.20
−0.65
Note: = number of sequences; = number of variable sites; = number of haplotypes; Hd = haplotype diversity ± standard deviation; = nucleotide diversity; = mean number of pairwise nucleotide differences; = theta per site; = theta per gene; and statistics (Fu and Li 1993) [21]; Fu’s ’s statistic; Strobeck statistic (Strobeck 1987) [22]; = Tajima’s (1989) [23] statistic; * < 0.05.
