Phylogenetic analysis of HbMADS4 with other MADS-box TFs by MEGA version 2.1 from CLUSTAL W alignments. The neighbor-joining method was used to construct the tree. The MADS-box TFs used in the evolutionary analysis are retrieved from Genbank including AG (Arabidopsis thaliana, P17839), AGL2 (A. thaliana, P29382), AGL3 (A. thaliana, 30678072), AGL11 (A. thaliana, GI12229648), AGL14 (A. thaliana, Q38838), AGL20 (A. thaliana, O64645), AGL22 (A. thaliana, Q9FVC1), AGL24 (A. thaliana,CAB79364), AGL42(A. thaliana AAN52777), AGL79 (A. thaliana, AAN52802), AP1 (A. thaliana, S27109), BpMADS6 (Betula pendula, CAA67968), DAL2 (Picea abies, S51934), DAL3 (P. abies, S51936), DAL12 (P. abies, AAF18375), EAP1 (Eucalyptus globules, AAG24909), EGM1(E. grandis, AAC78282), EGM2(E. grandis, AF029976), ETL(E. globulus, AAD16052), GBM5 (Ginkgo biloba, AAM76208), GGM1 (Gnetum gnemon, CAB44447), GGM2 (G. gnemon, CAB44448), GGM3 (G. gnemon, CAB44449), GGM12 (G. gnemon, CAB44458), HbMADS1 (Hevea brasiliensis,GU142913), HbMADS2 (H. brasiliensis, GU142914), HbMADS3 (H. brasiliensis,GU142915), HbMADS4 (H. brasiliensis, KX100586), MdMADS1 (Malus domestica, AAC25922), MdMADS2 (M. domestica, AAC83170), MdMADS3 (M. domestica, AAD51422), MdMADS13 (M. domestica, CAC80856), MdMADS14 (M. domestica, CAC80857), MdPI (M. domestica CAC28021), PkMADS1 (Paulownia kawakamii, AAF22455), PI (A. thaliana, NP_197524), PTD (Populus trichocarpa, AAC13695), PrMADS1 (Pinus radiata, T09569), and PrMADS4 (P. radiate, AAB80807).