RNA-Seq based expression profiles of HD-Zip genes that are differentially expressed in at least one time point under salt stress. The HD-Zip genes responsive to salt stress at the first trifoliolate stage in the roots of soybean cv. Williams 82 at least at one time point (1, 6 or 12 hr) are shown. The criteria for differential expression includes, (1) P-value corrected for multiple testing correction using Benjamini and Hochberg  to be less than 0.05, (2) two folder or greater fold change, (3) residual variance quotients of both control and treatment samples be less than 20. The criterion (3) filters genes that have significant variation between replicates.