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TIFY proteins play crucial roles in plant abiotic and biotic stress responses. Our transcriptome data revealed several  TIFY  family genes with significantly upregulated expression under drought, salt, and ABA treatments. However, the functions of the  GmTIFY  family genes are still unknown in abiotic stresses. We identified 38  GmTIFY  genes and found that  TIFY10  homologous genes have the most duplication events, higher selection pressure, and more obvious response to abiotic stresses compared with other homologous genes. Expression pattern analysis showed that  GmTIFY10e  and  GmTIFY10g  genes were significantly induced by salt stress. Under salt stress,  GmTIFY10e  and  GmTIFY10g  transgenic  Arabidopsis  plants showed higher root lengths and fresh weights and had significantly better growth than the wild type (WT). In addition, overexpression of  GmTIFY10e  and  GmTIFY10g  genes in soybean improved salt tolerance by increasing the PRO, POD, and CAT contents and decreasing the MDA content; on the contrary, RNA interference plants showed sensitivity to salt stress. Overexpression of  GmTIFY10e  and  GmTIFY10g  in  Arabidopsis  and soybean could improve the salt tolerance of plants, while the RNAi of  GmTIFY10e  and  GmTIFY10g  significantly increased sensitivity to salt stress in soybean. Further analysis demonstrated that  GmTIFY10e  and  GmTIFY10g  genes changed the expression levels of genes related to the ABA signal pathway, including  GmSnRK2 ,  GmPP2C ,  GmMYC2 ,  GmCAT1 , and  GmPOD . This study provides a basis for comprehensive analysis of the role of soybean  TIFY  genes in stress response in the future.

Genome-Wide Analysis of the Soybean TIFY Family and Identification of GmTIFY10e and GmTIFY10g Response to Salt Stress