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Summary  The   A rabidopsis thaliana   T ‐ DNA  insertion mutant  rh57‐1  exhibited hypersensitivity to glucose ( G lc) and abscisic acid ( ABA ). The other two  rh57  mutants also showed  G lc hypersensitivity similar to  rh57‐1 , strongly suggesting that the  G lc‐hypersensitive feature of these mutants results from mutation of   A t RH 57 .  rh57‐1  and  rh57‐3  displayed severely impaired seedling growth when grown in  G lc concentrations higher than 3%. The gene,   A t RH 57  ( A t3g09720), was expressed in all  A rabidopsis organs and its transcript was significantly induced by  ABA , high  G lc and salt. The new   A t RH 57  belongs to class  II DEAD ‐box  RNA  helicase gene family. Transient expression of   A t RH 57‐ EGFP   (enhanced green fluorescent protein) in onion cells indicated that  A t RH 57 was localized in the nucleus and nucleolus. Purified  A t RH 57‐ H is protein was shown to unwind double‐stranded  RNA  independent of  ATP   in vitro . The  ABA  biosynthesis inhibitor fluridone profoundly redeemed seedling growth arrest mediated by sugar.  rh57‐1  showed increased  ABA  levels when exposed to high  G lc. Quantitative real time polymerase chain reaction analysis showed that   A t RH 57  acts in a signaling network downstream of   HXK 1 . A feedback inhibition of  ABA  accumulation mediated by  A t RH 57 exists within the sugar‐mediated  ABA  signaling.  A t RH 57 mutation and high  G lc conditions additively caused a severe defect in small ribosomal subunit formation. The accumulation of abnormal pre‐r RNA  and resistance to protein synthesis‐related antibiotics were observed in  rh57  mutants and in the wild‐type  C ol‐0 under high  G lc conditions. These results suggested that  A t RH 57 plays an important role in r RNA  biogenesis in  A rabidopsis and participates in response to sugar involving  G lc‐ and  ABA  signaling during germination and seedling growth.

the plant journal

A t RH 57, a  DEAD ‐box  RNA  helicase, is involved in feedback inhibition of glucose‐mediated abscisic acid accumulation during seedling development and additively affects pre‐ribosomal  RNA  processing with high glucose