Figure 1

Bayesian consensus phylogram of 84 LOFSEP genes. Relationships estimated using the General Time Reversible (GTR) model, invariant sites and site specific rates partitioned according to codon position (GTR + I + SS). Phylogram rooted using Amborella AtAGL2 AY850179. Bold branches are supported by posterior probability ≥0.95. Family abbreviations: ACOR = Acoraceae, AMBO = Amborellaceae, AREC = Arecaceae, BRAS = Brassicaceae, CYPE = Cyperaceae, JOIN = Joinvilleaceae, LILI = Liliaceae, ORCH = Orchidaceae, POAC = Poaceae, REST = Restionaceae. Species abbreviations: Aa = Acorus americanus, Al = Aristida longiseta, As = Avena sativa, At = Arabidopsis thaliana, Atr = Amborella trichopoda, Bd = Brachypodium distachyon, Ci = Cyperus involucratus, Cl = Chasmanthium latifolium, Ct = Chondropetalum tectorum, Dl = Dendrocalamus latiflorus, Dg = Dendrobium grex Madame Thong-In, Ds = Danthonia spicata, Ea = Eriachne aristata, Ec = Eleusine coracana, Ee = Ehrharta erecta, Eg = Elaeis guianensis, Fn = Fargesia nitida, Hv = Hordeum vulgare, Ja = Joinvillea ascendens, Lh = Lithachne humilis, Ll = Lilium longiflorum, Lp = Lolium perenne, Lv = Leersia virginica, Mm = Megathyrsus maximus, Ms = Miscanthus sinensis, Ob = Oryza barthii, Og = Oryza glaberrima, Om = Oryza meridionalis, Os = Oryza sativa, Pg = Pennisetum glaucum, Pl = Pharus latifolius, Pm = Panicum maximum, Sa = Streptochaeta angustifolia, Sb = Sorghum bicolor, Si = Setaria italica, Ta = Triticum aestivum, Ti = Thamnochortus insignis, Zm = Zea mays. Green = LEAFY HULL STERILE1 (LHS1) clade, Blue branches = Oryza sativa MADS5 (OSM5) clade. Branch 1 = LHS1+OSM5 clade, Branch 2 = LHS1 clade, and Branch 3 = OSM5 clade. Branches 1 to 3 examined in PAML analyses were tested for evidence of potential positive selection (see also Additional File 3).