*2.2. Phylogenetic Analysis of XTH Proteins*

The phylogenetic tree was constructed using 38 OfXTHs from *O. fragrans*, 33 AtXTHs from *A. thaliana*, and 29 OsXTHs from *Oryza sativa* to analyze the evolutionary relationship (Figure 1). According to phylogenetic analysis, thirty-eight OfXTH proteins were classified into four groups in *O. fragrans*. Twenty-six OfXTHs belong to Group I/II. Group IIIA contained five OfXTH proteins. Group IIIB contained six OfXTH proteins. Only one protein, *OfXTH28*, belonged to Ancestral Group.

**Figure 1.** Phylogenetic analysis of XTH proteins from *O. fragrans*, *A. thaliana,* and *O. sativa*. Each subgroup is distinguished by a different color.
