Table III.
Change required in input parameter to account for a 3-fold higher P uptake of NIL-C443 compared with rice cv Nipponbare
| Parameter | Value | Change | P Uptake | Direct Effecta | Secondary Root Effectb | |||
|---|---|---|---|---|---|---|---|---|
| % | μg P | μg P | % | μg P | % | |||
| Seed P | Pseed | 129 | 200 | 3,894.6 | 86 | 6.6 | 2,447.3 | 188.5 |
| SRSA | α | 1.28 | 22 | 3,983.8 | 2,685.5 | 206.8 | ||
| Internal efficiency (root) | γr | 22 | 3,914.1 | 2,615.8 | 201.5 | |||
| P partitioning factor | θr | 22 | 3,911.6 | 2,613.3 | 201.3 | |||
| Root activity (duration) | 28 | 100 | 3,993.0 | 454.0 | 35.3 | 1,764.2 | 137.3 | |
| External P uptake efficiency | εn | 0.93 | 86 | 3,987.7 | 201.0 | 15.4 | 2,035.3 | 156.8 |
| (εa = 0.14; εm = 0.025) | εa | 0.187 | 33.5 | 3,961.9 | 244.4 | 19.0 | 1,875.4 | 145.9 |
| εm | 0.095 | 280 | 3,949.0 | 658.2 | 50.7 | 1,524.6 | 117.4 | |
| εa for 10d (εa = 0.172; εm = 0.025) | εa | 0.228 | 32.6 | 3,939.9 | 225.6 | 17.3 | 2,003.7 | 154.3 |
| εa for 20d (εa = 0.1167; εm = 0.025) | εa | 0.157 | 34.8 | 3,957.3 | 290.5 | 22.3 | 1,758.2 | 135.4 |
| εa = 0.163; εm = 0.001 | εa | 0.204 | 25 | 3,955.4 | 212.8 | 16.4 | 1,935.2 | 149.1 |
| α | 1.25 | 19 | 3,988.4 | 2,690.1 | 207.2 | |||
| εa = 0.117; εm = 0.05 | εa | 0.169 | 45 | 3,986.3 | 226.8 | 17.5 | 1,837.8 | 141.6 |
| α | 1.31 | 25 | 3,919.7 | 2,621.4 | 201.9 | |||
| One-step model | α | 37 | 3,972.0 | 395.5 | 30.8 | 1,480.5 | 115.2 | |
| NIL-C443 | 3,998.2 | |||||||
| Rice cv Nipponbare | — | 1,298.3 | — | — | — | |||
a Direct effects were estimated by using root growth estimates of the rice cv Nipponbare base model as direct inputs in simulation runs with altered input parameters. b Secondary root growth effects were estimated by using root growth estimates of simulation runs with altered parameters as direct inputs in further simulation runs while reversing the change in the parameter under investigation.