| Categories genes  | Tags growth  iron  mitochondria  root  homeostasis  shoot 
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  • Key message
    • Growth in the MIR T-DNA knockout rice mutant (mir) was significantly impaired compared to wild-type (WT) plants when grown under Fe-deficient or -sufficient conditions
    • We cloned and characterized a mitochondrial iron-regulated (MIR) gene in rice involved in Fe homeostasis
    • Rice-specific mitochondrial iron-regulated gene (MIR) plays an important role in iron homeostasis
    • MIR, when expressed in tobacco BY-2 cells, was localized to the mitochondria
    • These results clearly suggest that MIR is a rice-specific mitochondrial protein, recently evolved, and plays a significant role in Fe homeostasis
    • MIR transcripts were greatly increased in response to Fe deficiency in roots and shoot tissue
    • Furthermore, mir plants accumulated more than twice the amount of Fe in shoot and root tissue compared to WT plants when grown under either Fe-sufficient or -deficient conditions
    • Despite the high accumulation of Fe in roots and shoots, mir plants triggered the expression of Fe-deficiency-inducible genes, indicating that mir may not be able to utilize Fe for physiological functions
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