Fig. 6
From: CC-type glutaredoxins mediate plant response and signaling under nitrate starvation in Arabidopsis
A model of the roles of ROXYs in nitrate starvation signaling. a Under nitrate-deficient conditions, ROXY6,8,9,19–21 are upregulated, while ROXY10–17 are downregulated. ROS may be a signaling component that regulates the expression of some of these ROXY genes. b Based on gain-of-function data, ROXY15 or its paralogs, which are upregulated under nitrate-sufficient conditions, might increase chlorophyll content and inhibit root hair elongation, and downregulate the transcription of NRT2.1 while ROXY9 or its paralogs, which are upregulated under nitrate-deficient conditions, might reduce chlorophyll content and promote root hair elongation, and upregulate the transcription of NRT2.1. Up arrow, increase; down arrow, decrease; T-bar, inhibition