Fig. 1

Phylogenetic tree analysis of RNA helicase in Arabidopsis and sweetpotato. A The DEAD-box RNA helicase proteins in two species. B The DEAH-box RNA helicase proteins in two species. C The DExDH-box RNA helicase proteins in two species. These three subfamilies were used to construct the maximum-likelihood (ML) phylogenetic tree by MEGA X with 1,000 bootstrap replicates. Different subgroups are named based on the reports in Arabidopsis and are distinguished with different colors. The gene names are marked at the end of the branch, the red triangle and green circle represent the sweetpotato RNA helicase and Arabidopsis RNA helicase, respectively