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Many reports indicate that an abundance of really interesting new gene (RING) play key roles in regulating defense responses against abiotic and biotic stresses in plants. In this study, the cloning and functional characterization of a  RING  gene,  MaRING2 , in banana ( Musa acuminata ) fruit are reported.  MaRING2  belongs to the NEP1-interacting protein (NIP) RING-H2 finger protein family. Gene expression profiles revealed that  MaRING2  was cold responsive and induced by abscisic acid (ABA) treatment during cold storage. In this study, the  MaRING2  under control of the  Cauliflower mosaic virus 35S  (CaMV 35S) promoter was transformed to tobacco ( Nicotiana benthamiana ) using agrobacterium ( Agrobacterium tumefaciens )-mediated transformation. The resultant  MaRING2 -overexpressing transgenic plants ( 35S:MaRING2 ) exhibited significantly increased tolerance to low temperatures and were hypersensitive to exogenous ABA in terms of germination and early seedling growth. In addition, overexpression of  MaRING2  enhanced the expression of stress-responsive genes under normal (before cold stress) or cold conditions. These results demonstrate the biological role of  MaRING2  in conferring cold tolerance. Taken together, these results suggest that  MaRING2 , a C3H2C3-type RING protein, is a positive regulator of the ABA-dependent stress response.

MaRING2: A Positive Regulator of an Abscisic Acid-dependent Response to Cold Stress from Banana Fruit