| Categories genes  | Tags phosphate  root  insect  pi  growth  stress  homeostasis  plant growth  GA  Pi  phosphatase  Pi homeostasis 
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  • Key message
    • OsACP1 expression was up-regulated in the rice plant and in cell culture in the absence of phosphate (Pi)
    • OsACP1 expression was responsive to the level of Pi supply, with transcripts of OsACP1 being abundant in Pi-deprived root
    • The OsACP1 cDNA was expressed as a 30 kDa polypeptide in baculovirus-infected insect Sf9 cells
    • The induced expression of OsACP1 was a specific response to Pi starvation, and was not affected by the deprivation of other nutrients
    • Overexpression or mutation of OsACP1 affected Po degradation and utilization, which further influenced plant growth and productivity under both Pi-sufficient and Pi-deficient conditions
    • We concluded that OsACP1 is an active acid phosphatase that regulates rice growth under Pi stress conditions by recycling Pi from Po in the ER and GA
    • OsACP1 expression is specifically induced in almost all cell types of leaves and roots under Pi stress conditions
    • Moreover, overexpression of OsACP1 significantly affected intracellular Pi homeostasis and Pi starvation signalling
    • OsACP1 encodes an acid phosphatase with broad Po substrates and localizes in the endoplasmic reticulum (ER) and Golgi apparatus (GA)
    • Phylogenic analysis demonstrates that OsACP1 has a similar structure with human acid phosphatase PHOSPHO1
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