Abstract
Both the vegetative and the floral meristems of glasshouse-grown sunflowers respond to nitrogen supply in the same way. The duration of leaf and floret production is unaffected but the rate of production is decreased by low nitrogen supply. Thus both final leaf number and floret number are lowest at the lowest nitrogen supply. The activity of the vegetative meristem is directly related to the content of reduced nitrogen of the plant. Relief of nitrogen stress in the middle of the vegetative phase allows final leaf number to reach the unstressed number. However, relief of nitrogen stress during floral initiation showed that floret number is a function of the plant's content of reduced nitrogen at the beginning of floret production. Relief of nitrogen stress from the middle to the end of floret production did not increase floret number. Nitrogen supply did not influence the duration but did affect the rate of leaf expansion. Relief of nitrogen stress after leaf and floral initiation were complete caused a larger final area in those leaves still expanding and also lessened apical dominance so that some axillary buds developed into small flowers.
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Claims 13
Claim · model-written summary
Low nitrogen decreased the rate of leaf production.
- Taxon
- Sunflower
Helianthus annuust0 - Organ / stage
- leafe0
- Treatment
- low nitrogen supplye0
- Outcome
- rate of productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration of leaf and floret production is unaffected but the rate of production is decreased by low nitrogen supply.”
t0“Sunflower”
Claim · model-written summary
Low nitrogen decreased the rate of floret production.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- florete0
- Treatment
- low nitrogen supplye0
- Outcome
- rate of productione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration of leaf and floret production is unaffected but the rate of production is decreased by low nitrogen supply.”
t0“Sunflower”
Claim · model-written summary
Nitrogen supply did not alter the duration of leaf and floret production.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- low nitrogen supplye0
- Outcome
- duration of leaf and floret productione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration of leaf and floret production is unaffected but the rate of production is decreased by low nitrogen supply.”
t0“Sunflower”
Claim · model-written summary
Final leaf number was lowest at the lowest nitrogen supply.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- lowest nitrogen supplye0
- Outcome
- final leaf numbere0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus both final leaf number and floret number are lowest at the lowest nitrogen supply.”
t0“Sunflower”
Claim · model-written summary
Final floret number was lowest at the lowest nitrogen supply.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- lowest nitrogen supplye0
- Outcome
- floret numbere0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus both final leaf number and floret number are lowest at the lowest nitrogen supply.”
t0“Sunflower”
Claim · model-written summary
Vegetative meristem activity tracked reduced nitrogen content.
- Taxon
- SunflowerHelianthus annuust0
- Compound
- reduced nitrogene0
- Outcome
- activity of the vegetative meristeme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of the vegetative meristem is directly related to the content of reduced nitrogen of the plant.”
t0“Sunflower”
Claim · model-written summary
Relieving nitrogen stress in mid vegetative growth restored final leaf number to the unstressed number.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Relief of nitrogen stress in the middle of the vegetative phasee0
- Outcome
- final leaf numbere0
- Comparator
- unstressed numbere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relief of nitrogen stress in the middle of the vegetative phase allows final leaf number to reach the unstressed number.”
t0“Sunflower”
Claim · model-written summary
Floret number depended on reduced nitrogen at the start of floret production.
- Taxon
- SunflowerHelianthus annuust0
- Compound
- reduced nitrogene0
- Outcome
- floret numbere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“floret number is a function of the plant's content of reduced nitrogen at the beginning of floret production.”
t0“Sunflower”
Claim · model-written summary
Relieving nitrogen stress from mid to late floret production did not increase floret number.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Relief of nitrogen stress from the middle to the end of floret productione0
- Outcome
- floret numbere0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relief of nitrogen stress from the middle to the end of floret production did not increase floret number.”
t0“Sunflower”
Claim · model-written summary
Nitrogen supply did not alter leaf expansion duration.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- leafe0
- Treatment
- Nitrogen supplye0
- Outcome
- duratione0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply did not influence the duration but did affect the rate of leaf expansion.”
t0“Sunflower”
Claim · model-written summary
Nitrogen supply affected leaf expansion rate.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Nitrogen supplye0
- Outcome
- rate of leaf expansione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen supply did not influence the duration but did affect the rate of leaf expansion.”
t0“Sunflower”
Claim · model-written summary
Late relief of nitrogen stress increased final area of still expanding leaves.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Relief of nitrogen stress after leaf and floral initiation were completee0
- Outcome
- final area in those leaves still expandinge0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relief of nitrogen stress after leaf and floral initiation were complete caused a larger final area in those leaves still expanding”
t0“Sunflower”
Claim · model-written summary
Late relief of nitrogen stress lessened apical dominance and allowed axillary flower development.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- apical dominancee0
- Qualifier
- axillary buds developed into small flowerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lessened apical dominance so that some axillary buds developed into small flowers.”
t0“Sunflower”
The same questions in other papers
nitrogen · growth · Helianthus annuus (common sunflower)Results differ
62 papers in the same direction as this paper · 12 in the opposite direction · 1 reporting no difference from an alternative
- positive
- no effect
- negative
72 papers more in this group
See all 76 papers →nitrogen · yield · Helianthus annuus (common sunflower)Positive and negative results
181 papers in the same direction as this paper · 10 in the opposite direction · 4 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- no effect
- negative
192 papers more in this group
See all 196 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.