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Ethylene perceived by a family of five receptors regulates many developmental processes in  Arabidopsis . Here we conducted the yeast two-hybrid assay to screen for additional unidentified proteins that interact with subfamily II ethylene receptor ETR2. Three SAUR proteins, named SAUR76, 77 and 78, were identified to associate with both ETR2 and EIN4 in different assays. Interaction of SAUR76 and SAUR78 with ETR2 was further verified by co-immunoprecipitation and bimolecular fluorescence complementation (BiFC) assays. Expressions of  SAUR76-78  are induced by auxin and ethylene treatments. Compared with wild type,  SAUR- overexpressing plants exhibit reduced ethylene sensitivity, while  SAUR- RNAi lines exhibit enhanced ethylene sensitivity. Overexpressing the three  SAURs  partially complements the phenotype of subfamily II ethylene receptor loss-of-function double mutant  etr2-3ein4-4,  which has increased ethylene response and small cotyledon and rosette.  saur76  mutation partially suppresses the reduced ethylene sensitivity of  etr2-2 . SAUR76/78 proteins are regulated by 26S proteasome system and larger tag increases their protein stability. These findings suggest that SAUR76-78 may affect ethylene receptor signaling and promote plant growth in Arabidopsis.

RETRACTED ARTICLE: Three SAUR proteins SAUR76, SAUR77 and SAUR78 promote plant growth in Arabidopsis