Table 5.
Concentration and Proportion of Amino Acids and Nitrogen Content in the Leaf below the Ear of the Wild Type and Cytosolic GS-Deficient Mutants
| Amino Acid Concentration (μmol g DW−1) and Proportions (%)a
|
||||
|---|---|---|---|---|
| Amino Acid | Wild Type | gln1-4 | gln1-3 | gln1-3 gln1-4 |
| Asp | 1.85 ± 0.52 (11) | 4.19 ± 1.24 (10) | 1.61 ± 0.31 (6) | 1.07 ± 0.24 (3) |
| Asn | 0.58 ± 0.07 (3) | 6.18 ± 1.61 (15)b | 1.58 ± 0.10 (6)b | 11.91 ± 1.60 (29)b |
| Glu | 1.03 ± 0.15 (6) | 2.27 ± 0.22 (5)b | 3.56 ± 0.55 (14)b | 9.57 ± 3.88 (23)b |
| Gln | 3.56 ± 1.01 (21) | 6.85 ± 1.63 (16)c | 3.57 ± 0.10 (14)c | 1.96 ± 0.44 (5)c |
| Ala | 4.80 ± 1.41 (29) | 10.40 ± 1.58 (25) | 4.02 ± 0.12 (16) | 4.61 ± 1.59 (11) |
| GABAd | 0.11 ± 0.02 (1) | 0.15 ± 0.04 (1) | 0.21 ± 0.02 (1) | 0.30 ± 0.08 (1) |
| Pro | 0.86 ± 0.32 (5) | 1.25 ± 0.46 (3) | 1.17 ± 0.22 (5) | 0.64 ± 0.09 (2) |
| Others | 3.88 ± 0.67 (23) | 10.63 ± 1.61 (25) | 9.50 ± 0.51 (37) | 10.90 ± (27) |
| Total | 16.67 ± 3.66 (100) | 41.92 ± 7.20 (100)b | 25.22 ± 0.6 (100)b | 40.96 ± 4.73 (100)b |
| Total N (%) | 2.43 ± 0.16 | 2.84 ± 0.18b | 2.80 ± 0.16b | 2.77 ± 0.14b |
a
Amino acids were separated and quantified in maize plants 55 d after flowering. The plants were grown in the glasshouse on soil and watered daily with the medium described by Coïc and Lesaint (1971). Values are the mean of three plants ± sd. Relative amino acid proportions are given in parentheses.
b
Significant changes in the amino acid content and N content compared with the wild type at the 0.05 probability level.
c
No significant changes compared with the wild type.
d
GABA, γ-aminobutyrate.