Fig. 4.

Proposed model of the interaction between the Arabidopsis circadian clock and N-assimilatory pathway. Arrows indicate influences that affect the function of the two processes. The black arrow labeled “Clock regulation of N-assimilation” illustrates that clock function would affect N-assimilation. This influence is at least partly due to the direct regulatory role of CCA1 on N-assimilation. The gray arrow labeled “N-nutrient input” illustrates that N-assimilation would influence clock function through downstream metabolites such as Glu, Gln, and possibly other N-metabolites.