Abstract
This study aimed to test the hypothesis that increases in leaf nitrogen concentration would reduce the sensitivity of sugarcane photosynthesis to low temperature. IACSP95-5000 plants were grown inside a growth chamber at 30/20oC (day/night) and we evaluated the effects of leaf nitrogen spraying (2.5% urea) on plants facing low temperature (22/12°C) for eight days. The leaf nitrogen supply increased leaf nitrogen concentration and plants exhibited higher leaf gas exchange as compared to nonsprayed ones. We also found higher activity of the carboxylation enzymes, Rubisco and phosphoenolpyruvate carboxylase, as well as a higher chlorophyll content in plants sprayed with nitrogen. Such enhancement of photosynthetic performance was associated with an increase in number of leaves and in total leaf area. Our results suggest that the effects of low temperature on photosynthesis of field-grown sugarcane plants could be alleviated by leaf nitrogen supply, with likely consequences for biomass production and crop yield.
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Claims 7
Claim · model-written summary
Leaf nitrogen spraying increased sugarcane leaf nitrogen concentration relative to unsprayed plants.
- Taxon
- sugarcanet0
- Treatment
- leaf nitrogen spraying (2.5% urea)e1
- Outcome
- leaf nitrogen concentratione0
- Direction
- increasede0
- Comparator
- nonsprayed onese0
Not reportedMaterial
Verbatim
e0“The leaf nitrogen supply increased leaf nitrogen concentration and plants exhibited higher leaf gas exchange as compared to nonsprayed ones.”
e1“leaf nitrogen spraying (2.5% urea)”
t0“sugarcane”
Claim · model-written summary
Leaf nitrogen spraying raised gas exchange relative to unsprayed sugarcane.
Verbatim
e0“plants exhibited higher leaf gas exchange as compared to nonsprayed ones.”
e1“leaf nitrogen spraying (2.5% urea)”
t0“sugarcane”
Claim · model-written summary
Nitrogen sprayed plants had higher Rubisco activity.
- Taxon
- sugarcanet0
- Treatment
- sprayed with nitrogene0
- Gene
- Rubiscoe0
- Outcome
- activity of the carboxylation enzymes, Rubiscoe0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“higher activity of the carboxylation enzymes, Rubisco and phosphoenolpyruvate carboxylase, as well as a higher chlorophyll content in plants sprayed with nitrogen.”
t0“sugarcane”
Claim · model-written summary
Nitrogen sprayed plants had higher phosphoenolpyruvate carboxylase activity.
- Taxon
- sugarcanet0
- Treatment
- sprayed with nitrogene0
- Gene
- phosphoenolpyruvate carboxylasee0
- Outcome
- activity of the carboxylation enzymes, Rubisco and phosphoenolpyruvate carboxylasee0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“higher activity of the carboxylation enzymes, Rubisco and phosphoenolpyruvate carboxylase, as well as a higher chlorophyll content in plants sprayed with nitrogen.”
t0“sugarcane”
Claim · model-written summary
Nitrogen sprayed plants had higher chlorophyll content.
Not reportedComparator
Verbatim
e0“a higher chlorophyll content in plants sprayed with nitrogen.”
t0“sugarcane”
Claim · model-written summary
Improved photosynthetic performance was associated with more leaves and larger total leaf area.
- Taxon
- sugarcanet0
- Organ / stage
- leavese0
- Outcome
- photosynthetic performancee0
- Qualifier
- increase in number of leaves and in total leaf areae0
Not reportedDirection
Verbatim
e0“Such enhancement of photosynthetic performance was associated with an increase in number of leaves and in total leaf area.”
t0“sugarcane”
Claim · model-written summary
The authors suggest leaf nitrogen supply could alleviate low temperature effects on sugarcane photosynthesis.
Verbatim
e0“effects of low temperature on photosynthesis of field-grown sugarcane plants could be alleviated by leaf nitrogen supply”
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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.