Abstract
Sugar content, transcript levels of rbcS and rbcL, and ribulose-l,5-bisphosphate carboxylase/oxygenase (RuBisCO) content were measured in the first leaves of sunflower plants grown under high light and low nitrogen supply. After the peak level of the photosynthetic activity was attained, photosynthates accumulated, and the photosynthetic activity decreased. When these plants were supplied with high nitrogen, the sugar content decreased, and the transcript level of rbcS increased. Subsequently, the amount of RuBisCO increased. To decrease the leaf sugar level without changing the nitrogen supply, we applied DCMU, an inhibitor of photosynthesis, to the first leaves of the plants. This treatment also increased the transcript level of rbcS and suppressed the decrease in RuBisCO. These results indicate that sugar repression of rbcS may play a role in the early phases of leaf senescence under nitrogen deficiency.
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Claims 8
Claim · model-written summary
Photosynthates accumulated after peak photosynthetic activity.
- Taxon
- Sunflower
Helianthus annuust0 - Organ / stage
- Leavest0
- Outcome
- photosynthatese0
- Direction
- accumulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the peak level of the photosynthetic activity was attained, photosynthates accumulated”
t0“Sunflower Leaves”
Claim · model-written summary
Photosynthetic activity decreased after its peak.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- photosynthetic activitye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic activity decreased”
t0“Sunflower Leaves”
Claim · model-written summary
High nitrogen supply decreased sunflower leaf sugar content.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- high nitrogene0
- Outcome
- sugar contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When these plants were supplied with high nitrogen, the sugar content decreased”
t0“Sunflower Leaves”
Claim · model-written summary
High nitrogen supply increased rbcS transcript level.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- high nitrogene0
- Gene
- rbcSe0
- Outcome
- transcript level of rbcSe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When these plants were supplied with high nitrogen, the sugar content decreased, and the transcript level of rbcS increased”
t0“Sunflower Leaves”
Claim · model-written summary
RuBisCO amount subsequently increased after high nitrogen supply.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- high nitrogene1
- Gene
- RuBisCOe0
- Outcome
- amount of RuBisCOe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequently, the amount of RuBisCO increased”
e1“supplied with high nitrogen”
t0“Sunflower Leaves”
Claim · model-written summary
DCMU increased rbcS transcript level.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- DCMUe1
- Gene
- rbcSe0
- Outcome
- transcript level of rbcSe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This treatment also increased the transcript level of rbcS”
e1“we applied DCMU, an inhibitor of photosynthesis”
t0“Sunflower Leaves”
Claim · model-written summary
DCMU suppressed the decrease in RuBisCO.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- DCMUe1
- Gene
- RuBisCOe0
- Outcome
- RuBisCOe0
- Direction
- suppressed the decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suppressed the decrease in RuBisCO”
e1“we applied DCMU, an inhibitor of photosynthesis”
t0“Sunflower Leaves”
Claim · model-written summary
The authors infer sugar repression of rbcS may act in early leaf senescence under nitrogen deficiency.
- Taxon
- SunflowerHelianthus annuust0
- Gene
- rbcSe0
- Compound
- sugare0
- Outcome
- early phases of leaf senescencee0
- Qualifier
- under nitrogen deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sugar repression of rbcS may play a role in the early phases of leaf senescence under nitrogen deficiency”
t0“Sunflower Leaves”
The same questions in other papers
nitrogen · molecular: expression · Helianthus annuus (common sunflower)Positive and negative results
1 in the opposite direction
- negative
nitrogen · physiology: photosynthesis · Helianthus annuus (common sunflower)Positive and negative results
9 papers in the same direction as this paper · 2 in the opposite direction
- 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.