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. 2015 Jul 15;6:489. doi: 10.3389/fpls.2015.00489

Figure 4.

Figure 4

Consolidated model of 2-oxoglutarate sensing and actuation in root hairs of graminaceous plants. The role of intermediate metabolites of two major metabolic pathways: SAM to either ACC or NA, and p-coumaroyl-CoA(pCC) to either naringenin (flavonoids/isoflavonoids) or lignins, is presented. These ideas are centered on the non-catalytic electron transfers that characterize ACCO, sensor binding and information transfer by transcriptional factors, and kinetic data (existent and predicted). The model predicates root hair elongation as a function of cell wall loosening with concomitant iron -chelation and –pool restoration. Key: regulation (….), low activity (----). Abbreviations: PRPs, proline-rich glucoproteins; TOM1, transporter of the major facilitator superfamily; YS/YSL, yellow-stripe/ yellow-stripe like; ROS, reactive oxygen species; L-meth, L-methionine; pDELL, proteins with the N-terminal DELLA domain (RGA, RGL1, GAI, RGL2, RGL3); ABI, Absicisic acid insensitive; CHS, chalcone synthase; HCT, hydroxycinnamoyl-CoA: shikimate/quinate hyroxycinnamoyl-CoA transferase; pcCoA, p-coumaroyl-CoA; MAs, mugineic acids.