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. 2017 Oct 17;8:1757. doi: 10.3389/fpls.2017.01757

FIGURE 1.

FIGURE 1

The functions of the plasma membrane H+-ATPase in IAA polar transport and nutrient uptake. (1) The proton pump; (2) AUX1/LAX-mediated IAA-/H+ symport; (3) Lipophilic diffusion of protonated IAAH; (4) PIN proteins-mediated IAA- efflux; (5) Anion (NO3-, Cl-, SO42-, etc.) uptake via symport with H+; (6) Proton-coupled sucrose transporters-mediated sucrose (Suc) phloem loading; (7) cation (Mg2+, Ca2+, K+, etc.) uptake through various transporters.