Abstract
The use of kinetic equations of NO3- transport systems in oilseed rape (Brassica napus), determined by 15NO3- labeling under controlled conditions, combined with experimental field data from the INRA-Châlons rape database were used to model NO3- uptake during the plant growth cycle. The quantitative effects of different factors such as day/night cycle, ontogenetic stages, root temperature, photosynthetically active radiation, and soil nitrate availability on different components of the constitutive high-affinity transport systems, constitutive low-affinity transport systems, inducible low-affinity transport systems, and inducible high-affinity transport systems of nitrate were then determined to improve the model's predictions. Simulated uptake correlated well with measured values of nitrogen (N) uptake under field conditions for all N fertilization rates tested. Model outputs showed that the high-affinity transport system accounted for about 89% of total NO3- uptake (18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively) when no fertilizer was applied. The low-affinity transport system accounted for a minor proportion of total N uptake, and its activity was restricted to the early phase of the growth cycle. However, N fertilization in spring increased the duration of its contribution to total N uptake. Overall, data show that this mechanistic and environmentally regulated approach is a powerful means to simulate total N uptake in the field with the advantage of taking both physiologically regulated processes at the overall plant level and specific nitrate transport system characteristics into account.
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Claims 6
Claim · model-written summary
Simulated nitrate uptake correlated well with measured field nitrogen uptake at all tested fertilization rates.
- Taxon
- Oilseed Rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Outcome
- nitrogen (N) uptakee0
- Direction
- correlated welle0
- Comparator
- measured values of nitrogen (N) uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Simulated uptake correlated well with measured values of nitrogen (N) uptake under field conditions for all N fertilization rates tested”
t0“Oilseed Rape”
Claim · model-written summary
Without fertilizer, the high-affinity transport system accounted for about 89% of total nitrate uptake.
- Taxon
- Oilseed RapeBrassica napust0
- Outcome
- total NO3- uptakee0
- Value
- about 89%e0
- Qualifier
- when no fertilizer was appliede1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high-affinity transport system accounted for about 89% of total NO3- uptake”
e1“when no fertilizer was applied”
t0“Oilseed Rape”
Claim · model-written summary
Constitutive high-affinity transport accounted for 18% of nitrate uptake.
- Taxon
- Oilseed RapeBrassica napust0
- Outcome
- total NO3- uptakee1
- Value
- 18%e0
- Qualifier
- constitutive high-affinity transport systemse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively”
e1“total NO3- uptake”
t0“Oilseed Rape”
Claim · model-written summary
Inducible high-affinity transport accounted for 71% of nitrate uptake.
- Taxon
- Oilseed RapeBrassica napust0
- Outcome
- total NO3- uptakee1
- Value
- 71%e0
- Qualifier
- inducible high-affinity transport systemse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively”
e1“total NO3- uptake”
t0“Oilseed Rape”
Claim · model-written summary
The low-affinity system contributed a minor proportion of nitrogen uptake and was active only early in growth.
- Taxon
- Oilseed RapeBrassica napust0
- Outcome
- total N uptakee0
- Direction
- minor proportione0
- Qualifier
- early phase of the growth cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The low-affinity transport system accounted for a minor proportion of total N uptake, and its activity was restricted to the early phase of the growth cycle”
t0“Oilseed Rape”
Claim · model-written summary
Spring nitrogen fertilization increased the duration of low-affinity-system contribution to uptake.
- Taxon
- Oilseed RapeBrassica napust0
- Treatment
- N fertilization in springe0
- Outcome
- duration of its contribution to total N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization in spring increased the duration of its contribution to total N uptake”
t0“Oilseed Rape”
The same questions in other papers
fertilization · nutrient: content · Brassica napus (oilseed rape)Positive and negative results
94 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
105 papers more in this group
See all 109 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.