Table III.
Leaf N, Chl, Rubisco sites, and the fraction of leaf N invested in Rubisco of seven NAD-ME and seven NADP-ME grasses grown under high (HN) and low (LN) soil N supply (experiment 3; Table I)
Values are means ± se. Significance levels are as described in the legend of Figure 1.
| Species
|
Leaf N
|
Chl
|
Rubisco
|
Rubisco N
|
||||
|---|---|---|---|---|---|---|---|---|
| HN | LN | HN | LN | HN | LN | HN | LN | |
| mmol m−2 | μmol m−2 | μmol sites m−2 | % leaf N | |||||
| NAD-ME | ||||||||
| Astrebla lappacea | 103 ± 6 | 30 ± 1 | 389 ± 27 | 215 ± 0 | 11.1 ± 0.6 | 4.9 ± 0.3 | 8.4 ± 0.0 | 12.8 ± 1.4 |
| Astrebla pectinata | 126 ± 0 | 90 ± 6 | 453 ± 19 | 277 ± 0 | 6.8 ± 0.7 | 4.6 ± 0.3 | 4.2 ± 0.4 | 4.0 ± 0.0 |
| Eragrostis superba | 118 ± 1 | 48 ± 3 | 423 ± 11 | 263 ± 11 | 8.5 ± 0.2 | 4.7 ± 0.1 | 5.6 ± 0.2 | 7.7 ± 0.3 |
| Panicum coloratum | 119 ± 16 | 53 ± 2 | 473 ± 21 | 296 ± 27 | 11.0 ± 1.1 | 4.8 ± 0.3 | 7.3 ± 0.2 | 7.2 ± 0.3 |
| Panicum decompositum | 128 ± 5 | 60 ± 10 | 605 ± 60 | 383 ± 45 | 10.4 ± 1.2 | 6.9 ± 1.9 | 6.4 ± 0.5 | 8.8 ± 1.1 |
| Panicum miliaceum | 143 ± 7 | 47 ± 9 | 452 ± 25 | 224 ± 8 | 9.9 ± 1.9 | 3.6 ± 0.1 | 5.5 ± 1.3 | 6.1 ± 1.1 |
| Panicum virgatum | 132 ± 6 | 73 ± 2 | 646 ± 6 | 402 ± 10 | 8.8 ± 0.4 | 5.0 ± 0.3 | 5.3 ± 0.5 | 5.3 ± 0.2 |
| NADP-ME | ||||||||
| Bothriochloa biloba | 66 ± 4 | 44 ± 0 | 503 ± 69 | 326 ± 23 | 4.0 ± 0.6 | 2.4 ± 0.4 | 4.7 ± 0.4 | 4.3 ± 0.7 |
| Bothriochloa bladhi | 81 ± 3 | 60 ± 3 | 488 ± 25 | 512 ± 81 | 4.8 ± 0.1 | 4.6 ± 0.8 | 4.6 ± 0.3 | 6.0 ± 0.9 |
| Cenchrus ciliaris | 98 ± 1.4 | 27 ± 3 | 488 ± 16 | 203 ± 7 | 6.4 ± 0.4 | 2.0 ± 0.2 | 5.1 ± 0.2 | 5.7 ± 0.1 |
| Dichanthium sericeum | 83 ± 7 | 38 ± 1 | 586 ± 80 | 281 ± 9 | 7.4 ± 0.3 | 2.5 ± 0.2 | 7.0 ± 0.4 | 5.2 ± 0.5 |
| Paspalum dilatatum | 100 ± 12 | 40 ± 3 | 442 ± 71 | 268 ± 22 | 7.2 ± 0.6 | 4.5 ± 0.3 | 5.8 ± 1.2 | 8.8 ± 0.1 |
| Paspalum notatum | 87 ± 1 | 37 ± 1 | 536 ± 62 | 223 ± 10 | 8.2 ± 0.1 | 3.9 ± 0.4 | 7.4 ± 0.2 | 8.3 ± 0.5 |
| Pennisetum clandestinum | 108 ± 1 | 37 ± 1 | 462 ± 10 | 241 ± 14 | 6.0 ± 0.8 | 2.6 ± 0.0 | 4.4 ± 0.5 | 5.7 ± 0.1 |
| Average (NAD-ME) | 124 ± 5 | 57 ± 7 | 492 ± 36 | 294 ± 28 | 9.5 ± 0.6 | 4.9 ± 0.4 | 6.1 ± 0.5 | 7.4 ± 1.1 |
| Average (NADP-ME) | 89 ± 5 | 41 ± 4 | 501 ± 18 | 293 ± 39 | 6.3 ± 0.6 | 3.2 ± 0.4 | 5.6 ± 0.5 | 6.3 ± 0.6 |
| P (subtype) | *** | *** | ns | ns | *** | *** | ** | ** |
| P (N) | *** | *** | *** | *** | *** | *** | ** | ** |
| P (N × subtype) | ns | ns | ns | ns | ns | ns | ns | ns |