Abstract
Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves. Nitrogen deficiency reduced the chlorophyll concentration and photochemical capacity of the older leaves but not of young and recently mature leaves. The maximum rate of photosynthesis was reduced in leaves of all ages. This was correlated with a smaller leaf protein content and with an increase in CO 2 diffusion resistances. Although the rate of photosynthesis was reduced as much as 40% when plants were grown for 14 days without nitrogen, the effects were reversible, and activity could be restored to the normal rate within 4 days by adding nitrate nitrogen to the deficient nutrient solution.
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Claims 7
Claim · model-written summary
Nitrogen deficiency reduced chlorophyll concentration and photochemical capacity of older sugar beet leaves
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise0 - Organ / stage
- older leavese1
- Treatment
- Nitrogen deficiencye1
- Outcome
- chlorophyll concentration and photochemical capacitye1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e1“Nitrogen deficiency reduced the chlorophyll concentration and photochemical capacity of the older leaves”
Claim · model-written summary
Nitrogen deficiency did not reduce chlorophyll concentration or photochemical capacity of young and recently mature sugar beet leaves
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Organ / stage
- young and recently mature leavese2
- Treatment
- Nitrogen deficiencye1
- Outcome
- chlorophyll concentration and photochemical capacitye1
- Direction
- but note2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e1“Nitrogen deficiency reduced the chlorophyll concentration and photochemical capacity of the older leaves”
e2“but not of young and recently mature leaves”
Claim · model-written summary
Nitrogen deficiency reduced the maximum rate of photosynthesis in leaves of all ages of sugar beet
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Organ / stage
- leaves of all agese3
- Treatment
- Nitrogen deficiencye0
- Outcome
- maximum rate of photosynthesise3
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e3“The maximum rate of photosynthesis was reduced in leaves of all ages”
Claim · model-written summary
Photosynthesis reduction in sugar beet is correlated with smaller leaf protein content
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Organ / stage
- leafe4
- Outcome
- leaf protein contente4
- Direction
- smallere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e4“This was correlated with a smaller leaf protein content and with an increase in CO 2 diffusion resistances”
Claim · model-written summary
Photosynthesis reduction in sugar beet is correlated with increased CO2 diffusion resistances under nitrogen deficiency
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Treatment
- Nitrogen deficiencye0
- Outcome
- CO 2 diffusion resistancese4
- Direction
- increasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e4“This was correlated with a smaller leaf protein content and with an increase in CO 2 diffusion resistances”
Claim · model-written summary
Photosynthesis rate of sugar beet was reduced by as much as 40% after 14 days without nitrogen
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Treatment
- grown for 14 days without nitrogene5
- Outcome
- rate of photosynthesise5
- Direction
- reducede5
- Value
- 40%e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e5“Although the rate of photosynthesis was reduced as much as 40% when plants were grown for 14 days without nitrogen”
Claim · model-written summary
Adding nitrate nitrogen to deficient nutrient solution restored sugar beet photosynthetic activity within 4 days
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Treatment
- adding nitrate nitrogene6
- Outcome
- activitye6
- Direction
- restorede6
- Value
- within 4 dayse6
- Qualifier
- effects were reversiblee6
- Comparator
- deficient nutrient solutione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen deficiency was evaluated as an ecological factor affecting CO 2 assimilation in sugar beet ( Beta vulgaris L.) leaves”
e6“the effects were reversible, and activity could be restored to the normal rate within 4 days by adding nitrate nitrogen to the deficient nutrient solution”
The same questions in other papers
nitrogen · physiology: photosynthesis · Beta vulgaris (beet)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- negative
- positive
8 papers more in this group
See all 12 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.