Results indicate key regulatory features of the GATA NITRATE-INDUCIBLE CARBON-METABOLISM-INVOLVED (GNC) and GOLDEN TWO-LIKE (GLK2) transcription factor families that contribute to the control of chloroplast biogenesis and photosynthetic activity.
P69 binding to GLK proteins may interfere with the interaction between GLK proteins and upstream transcription factors causing defective binding of GLK proteins to their targets.
Overexpression of GLKs caused up-regulation of not only their direct targets but also non-target nuclear and plastid genes leading to global induction of chloroplast biogenesis in the root.
GLK1 and GLK2 are functionally equivalent. They act in a cell-autonomous manner to regulate chloroplast development. When mis-expressed in the phloem GLKs can be unloaded into adjoining photosynthetic tissue.
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