Table 2

Best-fitting models and parameter values for separate (rbcL,rps4-trnS,trnL, trnL-F, andtrnL&trnL-F) and simultaneous plastid datasets in this study
Region AIC selected model Base frequencies Substitution model (rate matrix) I G
A A–C A–G A–T
rbcL gene SYM+I+G 1.3128 7.2418 1.3793
rps4-trnS spacer HKY+G 0.3065
trnL intron GTR+I 0.3176 1.6096 5.9476 0.4952
trnL-F spacer GTR+G 0.3349 0.6845 5.1845 0.1986
trnL intron & trnL-F spacer GTR+I+G 0.3237 1.1111 5.5874 0.3645
simultaneous GTR+I+G 0.2970 1.0836 5.9681 0.7802

“G” = gamma distribution shape parameter [82]. “GTR” = general-time-reversible model [83]. “HKY” = Hasegawa-Kishino-Yano model [84]. “I” = proportion of invariable sites. “SYM” = symmetrical model [85]. “Ti/Tv” = transition/transversion ratio.

Zhang et al.

Zhang et al. BMC Evolutionary Biology 2012 12:180   doi:10.1186/1471-2148-12-180

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