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Ankyrin repeat (ANK) proteins are essential in cell growth, development, and response to hormones and environmental stresses. In the present study, 226  ANK  genes were identified and classified into nine subfamilies according to conserved domains in the soybean genome ( Glycine max  L.). Among them, the  GmANK114  was highly induced by drought, salt, and abscisic acid. The  GmANK114  encodes a protein that belongs to the ANK-RF subfamily containing a RING finger (RF) domain in addition to the ankyrin repeats. Heterologous overexpression of  GmANK114  in transgenic  Arabidopsis  improved the germination rate under drought and salt treatments compared to wild-type. Homologous overexpression of  GmANK114  improved the survival rate under drought and salt stresses in transgenic soybean hairy roots. In response to drought or salt stress,  GmANK114  overexpression in soybean hairy root showed higher proline and lower malondialdehyde contents, and lower H 2 O 2  and O 2–  contents compared control plants. Besides,  GmANK114  activated transcription of several abiotic stress-related genes, including  WRKY13 ,  NAC11 ,  DREB2 ,  MYB84 , and  bZIP44  under drought and salt stresses in soybean. These results provide new insights for functional analysis of soybean ANK proteins and will be helpful for further understanding how ANK proteins in plants adapt to abiotic stress.

The Ankyrin-Repeat Gene GmANK114 Confers Drought and Salt Tolerance in Arabidopsis and Soybean