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Table 2 Results of distances and codon-based Z tests for purifying selection between maize and other plant species for orthologs JAZ groups

From: Identification and evolution analysis of the JAZ gene family in maize

Ortholog maize-rice maize-sorghum maize-brachypodium maize-Arabidopsis dS-dN Stat from test of
clade dS dN dS dN dS dN dS dN dS > dN (purifying selection)
JAZ1 0.426 ± 0.042 0.202 ± 0.025 0.143 ± 0.029 0.074 ± 0.014 0.410 ± 0.042 0.231 ± 0.026 0.680 ± 0.039 0.507 ± 0.031 6.117*
JAZ2 0.316 ± 0.044 0.149 ± 0.025 0.129 ± 0.034 0.043 ± 0.014 0.325 ± 0.046 0.126 ± 0.024 0.654 ± 0.047 0.462 ± 0.038 5.250*
JAZ3 0.410 ± 0.041 0.162 ± 0.023 0.285 ± 0.034 0.131 ± 0.019 0.391 ± 0.040 0.189 ± 0.026 0.660 ± 0.041 0.499 ± 0.033 7.947*
JAZ4 0.324 ± 0.058 0.281 ± 0.044 0.245 ± 0.050 0.215 ± 0.038 0.340 ± 0.058 0.271 ± 0.045 n/a n/a 1.532
JAZ5 0.497 ± 0.038 0.222 ± 0.022 0.379 ± 0.035 0.171 ± 0.018 0.478 ± 0.038 0.234 ± 0.024 0.683 ± 0.034 0.593 ± 0.030 8.495*
JAZ6 n/a n/a n/a n/a n/a n/a n/a n/a 4.287*
Overall 0.522 ± 0.064 0.308 ± 0.048 0.516 ± 0.063 0.274 ± 0.045 0.533 ± 0.064 0.305 ± 0.047 0.704 ± 0.068 0.364 ± 0.051 7.402*
  1. *Estimations of synonymous and nonsynonymous distance between two species are referred as dS and dN, respectively. To be considered under purify selection, a dN/dS ratio less than 1 (dS > dN) and a p-value for the Z-test below 0.05 were required (*, P < 0.05). According to these criteria, almost all JAZ genes were determined to be under purify selection, except for JAZ group 4 which was under neutral selection. Sixty JAZ sequences in total were included in this analysis