Notes S1 Possibilities of replacement of phosphorus by other elements – phospholipids.

Notes S2 Possibility of decreasing the low-molecular-mass water-soluble P esters.

Notes S3 N and P removal from senescing structures in relation to phloem function.

Notes S4 Molecular constraints of Pi remobilization from senescing leaves.

Table S1 Proton permeability (PH+) as a function of membrane lipid composition

Table S2 Nitrogen and phosphorus in phloem sap

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