Abstract
Storage nitrogen (N) is a buffer pool for maintaining leaf growth and synthesizing photosynthetic proteins, but the dynamics of its forms within the life cycle of a single leaf and how it is influenced by N supply remain poorly understood. A field experiment was conducted to estimate the influence of N supply on leaf growth, photosynthetic characteristics, and N partitioning inthe sixth leaf of winter oilseed rape (Brassica napus L.) from emergence through senescence. Storage N content (Nstore) decreased gradually along with leaf expansion. The relative growth rate based on leaf area (RGRa) was positively correlated with Nstore during leaf expansion. The water-soluble protein form of storage N was the main N source for leaf expansion. After the leaves fully expanded, the net photosynthetic rate (An) followed a linear-plateau response to Nstore, with An stabilizing at the highest value above a threshold and declining below the threshold. Non-protein and SDS (detergent)-soluble protein forms of storage N were the main N sources for maintaining photosynthesis. For the leaf N economy, storage N is used for co-ordinating leaf expansion and photosynthetic capacity. N supply can improve Nstore, thereby promoting leaf growth and biomass.
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Claims 7
Claim · model-written summary
Storage nitrogen content gradually decreased as oilseed rape leaves expanded.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Organ / stage
- leaf expansione0
- Outcome
- Storage N content (Nstore)e0
- Direction
- decreased graduallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Storage N content (Nstore) decreased gradually along with leaf expansion.”
t0“winter oilseed rape”
Claim · model-written summary
Leaf area relative growth rate was positively correlated with storage nitrogen during leaf expansion.
- Taxon
- winter oilseed rapeBrassica napust0
- Organ / stage
- leaf expansione0
- Outcome
- relative growth rate based on leaf area (RGRa)e0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative growth rate based on leaf area (RGRa) was positively correlated with Nstore during leaf expansion.”
t0“winter oilseed rape”
Claim · model-written summary
Water-soluble protein storage nitrogen was the main nitrogen source for leaf expansion.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- leaf expansione0
- Qualifier
- water-soluble protein form of storage Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water-soluble protein form of storage N was the main N source for leaf expansion.”
t0“winter oilseed rape”
Claim · model-written summary
Net photosynthetic rate followed a linear-plateau relation with storage nitrogen after full leaf expansion, stabilizing above a threshold and declining below it.
- Taxon
- winter oilseed rapeBrassica napust0
- Organ / stage
- leaves fully expandede0
- Outcome
- net photosynthetic rate (An)e0
- Direction
- linear-plateau responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the leaves fully expanded, the net photosynthetic rate (An) followed a linear-plateau response to Nstore, with An stabilizing at the highest value above a threshold and declining below the threshold.”
t0“winter oilseed rape”
Claim · model-written summary
Non-protein and SDS-soluble protein storage nitrogen were the main nitrogen sources for maintaining photosynthesis.
- Taxon
- winter oilseed rapeBrassica napust0
- Outcome
- maintaining photosynthesise0
- Qualifier
- Non-protein and SDS (detergent)-soluble protein forms of storage Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-protein and SDS (detergent)-soluble protein forms of storage N were the main N sources for maintaining photosynthesis.”
t0“winter oilseed rape”
Claim · model-written summary
Nitrogen supply increased storage nitrogen in oilseed rape.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N supplye0
- Outcome
- Nstoree0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N supply can improve Nstore, thereby promoting leaf growth and biomass.”
t0“winter oilseed rape”
Claim · model-written summary
Nitrogen supply promoted leaf growth and biomass in oilseed rape.
- Taxon
- winter oilseed rapeBrassica napust0
- Treatment
- N supplye0
- Outcome
- leaf growth and biomasse0
- Direction
- promotinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N supply can improve Nstore, thereby promoting leaf growth and biomass.”
t0“winter oilseed rape”
The same questions in other papers
nitrogen · growth · Brassica napus (oilseed rape)Positive and negative results
64 papers in the same direction as this paper · 17 in the opposite direction
- negative
- no effect
- negative
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See all 82 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.