OsGLK1

| Categories genes  | Tags chloroplast  transcription factor  seedling  phytohormone  vascular bundle  sheath 
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  • Key message
    • Using rice expression-microarray and northern blot analyses, we found that a large number of nucleus-encoded genes involved in chloroplast functions were highly expressed and transcripts of plastid-encoded genes, psaA, psbA and rbcL, increased in the OsGLK1-FOX calli
    • Transmission electron microscopy showed the existence of differentiated chloroplasts with grana stacks in OsGLK1-FOX calli cells
    • Furthermore, we found developed chloroplasts in vascular bundle and bundle sheath cells of coleoptiles and leaves from OsGLK1-FOX seedlings
    • The OsGLK1-FOX calli exhibited high photosynthetic activity and were able to grow on sucrose-depleted media, indicating that developed chloroplasts in OsGLK1-FOX rice calli are functional and active
    • These results strongly suggest that OsGLK1 regulates chloroplast development under the control of light and phytohormones, and that it is a key regulator of chloroplast development
    • Ectopic overexpression of the transcription factor OsGLK1 induces chloroplast development in non-green rice cells
    • In both lines, OsGLK1 cDNA encoding a GARP transcription factor was ectopically overexpressed
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