OsSRFP1,SDEL2

| Categories genes  | Tags oxidative stress  yield  oxidative  abiotic stress  culm  tolerance  stress  abscisic acid  stress tolerance  biotic stress  stress response  Ubiquitin  reactive oxygen species  Pi  pi 
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  • Key message
    • Interestingly, the OsSRFP1-overexpressing plants were less tolerant to salt, cold and oxidative stresses than wild type plants; while the RNA interference silencing of OsSRFP1 plants were more tolerant than wild type without yield penalty
    • Knock-down of stress inducible OsSRFP1 encoding an E3 ubiquitin ligase with transcriptional activation activity confers abiotic stress tolerance through enhancing antioxidant protection in rice.
    • Taken together, our results demonstrate that OsSRFP1 may have dual functions in post-translational and transcriptional regulations in modulating abiotic stress responses in rice, at least in part, by negatively regulating antioxidant enzymes-mediated reactive oxygen species removal
    • OsSRFP1 was ubiquitously expressed in various rice organs, with the higher expression levels in roots, panicles and culm nodes
    • The transcript of OsSRFP1 was induced by cold, dehydration, salt, H2O2 and abscisic acid treatments
    • In vitro ubiquitination assays showed that OsSRFP1 possessed E3 ubiquitin ligase activity and the intact RING domain was essential for the activity
    • Consistent with this biochemical function of SDEL1 and SDEL2, enhancing the expression of SDEL1 and SDEL2 results in Pi over-accumulation and induces Pi-starvation signaling even under Pi-sufficient conditions
    • Therefore SDEL1 and SDEL2 facilitate the degradation of SPX4 to modulate PHR2 activity and regulate Pi-homeostasis and Pi-signaling in response to external Pi availability in rice
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