Figure 1.

Summary of investigated plant species and their phylogenetic relationship. There were 350 WOX sequences of 50 species in 21 families from green algae to angiosperms. The numbers in black mean the amount of species and the numbers in red mean the amount protein sequences of WOX family. The species include Arabidopsis lyrata, Arabidopsis thaliana, Arachis hypogaea, Artemisia annua, Brassica napus, Brassica rapa, Carica papaya, Citrus sinensis, Cucumis sativus, Glycine max, Gossypium hirsutum, Helianthus annuus, Lotus japonicus, Malus x domestica, Manihot esculenta, Medicago truncatula, Mimulus guttatus, Nicotiana tabacun, Petunia x hybrida, Phaseolus coccineus, Populus trichocarpa, Prunus persica, Raphanus sativus, Ricinus communis, Solanum lycopersicum, Solanum tuberosum, Theobroma cacao, Vigna unguiculata, Vitis vinifera, Brachypodium distachyon, Hordeum vulgare, Lycoris longituba, Oryza sativa, Panicum virgatum, Saccharum officinarum, Sorghum bicolor, Triticum aestivum, Zea mays, Amborella trichopoda, Ginkgo biloba, Gnetum gnemon, Picea abies, Picea sitchensis, Pinus sylvestris, Pinus taeda, Selaginella moellendorffii, Physcomitrella patens, Micromonas, Ostreococcus tauri, and Ostreococcus lucimarinus.