Abstract
Abstract. The effect of nitrate supply upon leaf area development in willow ( Salix viminalis ) was investigated. Rooted cuttings were grown in culture solution at two different rates of exponentially‐increasing nitrate supply and with free access to other nutrients. During the lag‐phase in attaining stable nutrition, the rate of production of unfolded leaves, in the treatment with poorer N‐supply, decreased. After acclimation to the different N‐availabilities, the rate of dry matter increase per plant nitrogen was constant and the same in both treatments. The ratio of total leaf area to total amount of nitrogen in the plant was slightly higher in the treatment with poorer nitrogen supply. During the exponential (stable) phases of growth, nearly all the increase in total leaf area was attributable to main‐stem leaves; large numbers of leaves on axillary shoots in the treatment with better N‐supply contributed little to the total area. During the stable growth phase, the rate of production of unfolded leaves was the same in both treatments. Higher maximum values of relative rate of increase in area of single leaves were found with a better N‐supply and at higher leaf positions on the main stem. The duration of leaf expansion was not much affected by N‐supply. Final leaf size was greater at higher positions on the main‐stem. Within a treatment (investigated for poorer N‐supply), differences in final leaf size were proportional to differences in numbers of epidermal cells. Final leaf size was greater, at the same node, in the treatment with better N‐supply. Better N‐availability had increased the final size but not the number of epidermal cells. It was concluded that the higher exponential rate of total area increase with a better N‐supply was largely associated with higher rates of expansion in epidermal cells.
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Claims 13
Claim · model-written summary
Poorer nitrogen supply decreased unfolded leaf production during the lag phase.
SalixNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“During the lag‐phase in attaining stable nutrition, the rate of production of unfolded leaves, in the treatment with poorer N‐supply, decreased.”
Claim · model-written summary
Dry matter increase per plant nitrogen was constant and equal across nitrate treatments after acclimation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“After acclimation to the different N‐availabilities, the rate of dry matter increase per plant nitrogen was constant and the same in both treatments.”
Claim · model-written summary
Total leaf area per plant nitrogen was slightly higher with poorer nitrogen supply.
- Treatment
- poorer nitrogen supplye0
- Outcome
- ratio of total leaf area to total amount of nitrogene0
- Direction
- slightly highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“The ratio of total leaf area to total amount of nitrogen in the plant was slightly higher in the treatment with poorer nitrogen supply.”
Claim · model-written summary
Main stem leaves accounted for nearly all total leaf area increase during stable growth, whereas numerous axillary leaves contributed little.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“During the exponential (stable) phases of growth, nearly all the increase in total leaf area was attributable to main‐stem leaves; large numbers of leaves on axillary shoots in the treatment with better N‐supply contributed little to the total area.”
Claim · model-written summary
Unfolded leaf production was the same under both nitrate treatments during stable growth.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“During the stable growth phase, the rate of production of unfolded leaves was the same in both treatments.”
Claim · model-written summary
Better nitrogen supply and higher main stem leaf positions had higher maximum relative leaf area increase rates.
- Organ / stage
- higher leaf positions on the main steme0
- Treatment
- better N‐supplye0
- Outcome
- relative rate of increase in area of single leavese0
- Direction
- Highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Higher maximum values of relative rate of increase in area of single leaves were found with a better N‐supply and at higher leaf positions on the main stem.”
Claim · model-written summary
Leaf expansion duration changed little with nitrogen supply.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“The duration of leaf expansion was not much affected by N‐supply.”
Claim · model-written summary
Final leaf size was greater at higher main stem positions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Final leaf size was greater at higher positions on the main‐stem.”
Claim · model-written summary
Within the poorer nitrogen treatment, final leaf size differences were proportional to epidermal cell number differences.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Within a treatment (investigated for poorer N‐supply), differences in final leaf size were proportional to differences in numbers of epidermal cells.”
Claim · model-written summary
At the same node, better nitrogen supply increased final leaf size.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Final leaf size was greater, at the same node, in the treatment with better N‐supply.”
Claim · model-written summary
Better nitrogen availability increased final epidermal cell size.
- Organ / stage
- epidermal cellse0
- Treatment
- Better N‐availabilitye0
- Outcome
- final sizee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Better N‐availability had increased the final size but not the number of epidermal cells.”
Claim · model-written summary
Better nitrogen availability did not increase epidermal cell number.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“Better N‐availability had increased the final size but not the number of epidermal cells.”
Claim · model-written summary
Authors concluded that higher total area increase under better nitrogen supply was associated with faster epidermal cell expansion.
- Organ / stage
- epidermal cellse0
- Treatment
- better N‐supplye0
- Outcome
- exponential rate of total area increasee0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“willow (Salix viminalis)”
e0“the higher exponential rate of total area increase with a better N‐supply was largely associated with higher rates of expansion in epidermal cells”
The same questions in other papers
nitrogen · yield · Salix (willows)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
nitrogen · growth · Salix (willows)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.