Table 2.
Contrasts of Suaedoideae PEPC kinetic parameters (K m for PEP, Hill coefficient, and V max) under saturating Mg2+ and
Contrasts were done based on amino acid residues 733 (M, L, or F) and 780 (S or A) or photosynthetic mode; see Table 1. In contrasts 1–3, amino acids are compared, MS (C4) occurs in Schoberia species, LA (C4) occurs in Salsina species and single-cell S. aralocaspica, and FA (C3) represents C3 species. In contrasts 4–9, the four photosynthetic modes are being compared, Schoberia type C4 (S. eltonica and S. accuminata), Salsina type C4 (S. fruticosa and S. moquinii), single-cell C4 (S. aralocaspica), and C3 species (S. linearis, S. linifolia, and S. physophora). *, Significant at the P <0.05 level of significance. (+) Indicates whether the first component of the contrast is larger than the second component and (–) indicates that the first component of the contrast is smaller than the second component. Maize data were excluded from analysis.
| Contrast | K m | Hill coefficient | PEPC V max | |||
|---|---|---|---|---|---|---|
| No G6P | 5mM G6P | No G6P | 5mM G6P | No G6P | 5mM G6P | |
| 1. MS (C4)×LA (C4) | *(+) | (–) | *(+) | (+) | (–) | (–) |
| 2. MS (C4)×FA (C3) | *(+) | *(+) | *(+) | (+) | *(+) | *(+) |
| 3. LA (C4) x FA (C3) | *(+) | *(+) | *(+) | (+) | *(+) | *(+) |
| 4. Schoberia C4 (MS)×Salsina C4 (LA) | *(+) | (–) | *(+) | (+) | *(–) | *(–) |
| 5. Schoberia C4 (MS)×SC C4 (LA) | (–) | (–) | (+) | (+) | *(–) | *(–) |
| 6. Salsina C4 (LA)×SC C4 (LA) | (+) | (+) | (–) | (+) | (+) | (–) |
| 7. Schoberia C4 (MS)×C3 (FA) | *(+) | *(+) | *(+) | (–) | *(+) | *(+) |
| 8. Salsina C4 (LA)×C3 (FA) | *(+) | *(+) | *(+) | (–) | *(–) | *(+) |
| 9. SC C4 (LA)×C3 (FA) | *(+) | *(+) | *(+) | (–) | *(+) | *(+) |