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Table 1.

Amino acid composition of diets formulated to mimic the phloem sap composition of developmentally young and mature potato plants

Amino acidaWeek 5 plantsbmol%`Young' diet mol% (mmol l-1)Week 10.5 plantsc mol%`Old' diet mol% (mmol l-1)
Alanine (Ala) 4.1 3.3 (4.9) 4.0 2.8 (4.2) 
Arginined (Arg) 2.6 3.8 (5.7) 3.0 4.4 (6.6) 
Asparagine (Asn) 6.1 4.9 (7.4) 4.7 3.3 (4.9) 
Aspartate (Asp) 12.8 10.4 (15.6) 14.1 9.8 (14.7) 
Cysteine (Cys) — 1.5 (2.2) — 1.3 (1.9) 
Glutamine (Gln) 30.1 24.4 (36.6) 11.0 7.6 (11.5) 
Glutamate (Glu) 16.7 13.5 (20.3) 23.9 16.6 (24.9) 
Glycine (Gly) 1.8 1.4 (2.1) 1.5 1.0 (1.5) 
Histidined (His) 0.7 1.0 (1.4) 1.2 1.8 (2.7) 
Isoleucined(Ile) 1.6 2.3 (3.4) 3.7 5.4 (8.0) 
Leucined (Leu) 1.6 2.3 (3.4) 4.2 6.2 (9.3) 
Lysined (Lys) 2.4 3.5 (5.2) 3.6 5.2 (7.8) 
Methionined(Met) 1.0 1.5 (2.2) 1.3 1.9 (2.9) 
Phenylalanined(Phe) 2.1 3.0 (4.6) 4.0 5.8 (8.7) 
Proline (Pro) — 3.3 (4.9) — 2.8 (4.2) 
Serine (Ser) 6.7 5.4 (8.1) 5.5 3.8 (5.7) 
Threonined (Thr) 4.3 6.4 (9.6) 4.1 6.0 (9.1) 
Tryptophand(Trp) 2.4 3.5 (5.3) 4.1 6.0 (8.9) 
Tyrosine (Tyr) 0.5 0.4 (0.6) 1.3 0.9 (1.4) 
Valined (Val) 2.8 4.1 (6.2) 4.9 7.1 (2.9) 
Essential amino acids (% of total) 22.4 31.4 34.0 50.0 
Amino acidaWeek 5 plantsbmol%`Young' diet mol% (mmol l-1)Week 10.5 plantsc mol%`Old' diet mol% (mmol l-1)
Alanine (Ala) 4.1 3.3 (4.9) 4.0 2.8 (4.2) 
Arginined (Arg) 2.6 3.8 (5.7) 3.0 4.4 (6.6) 
Asparagine (Asn) 6.1 4.9 (7.4) 4.7 3.3 (4.9) 
Aspartate (Asp) 12.8 10.4 (15.6) 14.1 9.8 (14.7) 
Cysteine (Cys) — 1.5 (2.2) — 1.3 (1.9) 
Glutamine (Gln) 30.1 24.4 (36.6) 11.0 7.6 (11.5) 
Glutamate (Glu) 16.7 13.5 (20.3) 23.9 16.6 (24.9) 
Glycine (Gly) 1.8 1.4 (2.1) 1.5 1.0 (1.5) 
Histidined (His) 0.7 1.0 (1.4) 1.2 1.8 (2.7) 
Isoleucined(Ile) 1.6 2.3 (3.4) 3.7 5.4 (8.0) 
Leucined (Leu) 1.6 2.3 (3.4) 4.2 6.2 (9.3) 
Lysined (Lys) 2.4 3.5 (5.2) 3.6 5.2 (7.8) 
Methionined(Met) 1.0 1.5 (2.2) 1.3 1.9 (2.9) 
Phenylalanined(Phe) 2.1 3.0 (4.6) 4.0 5.8 (8.7) 
Proline (Pro) — 3.3 (4.9) — 2.8 (4.2) 
Serine (Ser) 6.7 5.4 (8.1) 5.5 3.8 (5.7) 
Threonined (Thr) 4.3 6.4 (9.6) 4.1 6.0 (9.1) 
Tryptophand(Trp) 2.4 3.5 (5.3) 4.1 6.0 (8.9) 
Tyrosine (Tyr) 0.5 0.4 (0.6) 1.3 0.9 (1.4) 
Valined (Val) 2.8 4.1 (6.2) 4.9 7.1 (2.9) 
Essential amino acids (% of total) 22.4 31.4 34.0 50.0 
a

Abbreviated amino acid names are shown in parentheses.

b

Pre-tuber-filling plants.

c

Tuber-filling plants.

d

Essential amino acids as defined by Morris(1991).

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