Table 4

Selection tests of starch synthases in A. thaliana
Positive selection Purifying selection Tajima’s D
Z statistic p value Z statistic p value D value p value
AtSSI −4.150 1.000 4.244 0.000 0.757 p > 0.10
AtSSII −0.706 1.000 0.721 0.236 −1.386 p > 0.10
AtSSIII −2.870 1.000 2.811 0.003 −0.357 p > 0.10
AtSSIV −1.692 1.000 1.758 0.041 −0.992 p > 0.10
AtGBSS −2.644 1.000 2.497 0.004 0.309 p > 0.10

Z-test of selection with null hypothesis (H0: dN = dS) was tested with two different alternative hypothesis such as positive selection (HA: dN > dS) and purifying selection (HA: dN < dS). Z statistics and Tajima’s D as well as significance values (p value) were calculated with coding sequences (CDS) of each starch synthase.

Schwarte et al.

Schwarte et al. BMC Research Notes 2013 6:84   doi:10.1186/1756-0500-6-84

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