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Table 4 Tests for positive selection among codons of GRAS genes using site-specific model

From: Unusual tandem expansion and positive selection in subgroups of the plant GRAS transcription factor superfamily

Model

lnL

Estimates of parameter a

2ΔlnL

Positive selection sites b

M0(one-ratio)

−82992.756

ω = 0.12433

3508.354

Not allowed

M3(discrete)

−81238.579

p0 = 0.20058 ω0 = 0.03406

(M3vsM0)**

None

p1 = 0.55607 ω1 = 0.10851

p2 = 0.23655 ω2 = 0.28245

M7(beta)

−81023.838

p = 0.99909 q = 4.93337

0.002

Not allowed

M8(beta & ω)

−81023.839

p0 = 0.99999 p = 0.99909

(M8vsM7)

None

q = 4.93337 p1 = 0.00001

ω = 1.00000

  1. Note: *p < 0.05 and **p < 0.01 (x 2 test).
  2. aω was estimated under model M0,M3,M7, and M8; p and q are the parameters of the beta distribution.
  3. bThe number of amino acid sites estimated to have undergone positive selection.
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BMC Plant Biology

ISSN: 1471-2229

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