Wheat amino acid transporters highly expressed in grain cells regulate amino acid accumulation in grain
Fig 7
Schematic view of three amino acid transporters in nitrogen transport.
(a), Wheat grain transverse section. (b), Wheat grain longitudinal section. VB: vascular bundle; EC: endosperm cavity for amino acids delivered to endosperm from vascular bundle; NPTC: nucellar projection transfer cells; ETC: endosperm transfer cells, TaAAP2 expression localization for uptake of amino acids from endosperm cavity; SE: starch endosperm; SA: sub-aleurone cells for proteins (mainly ω and α-gliadins, LMW-glutenin subunits), and TaAAP13 expression localization; AL: aleurone cells for TaAAP21 expression localization. ES: epithelium of scutellum for TaAAP21 expression localization. SC: scutellum. EM: embryo.