Abstract
Aims Jatropha curcas is a drought-resistant perennial that can be used for bio-energy to replace petro-diesel. However, J. curcas is still a wild plant and basic agronomical properties are not thoroughly understood. When it is grown in commercial plantations with regular irrigation, we do not know how J. curcas will respond to changes in the environment. Our objective was to evaluate the effects of different soil water and nitrogen supplies on the photosynthesis characteristics of J. curcas seedlings. Methods We exposed seedlings of J. curcas to three watering regimes (80%, 50% and 30% of field water holding capacity (FC)) and two nitrogen (N) regimes (with or without N-fertilization) and determined how N-fertilization affects the photosynthetic light and CO2 response curve, maximal quantum yield of PSII, and N and pigments contents under different soil water conditions. Important findings With N-fertilization, we detected significant increases in apparent quantum yield (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pmax), carboxylation efficiency (CE), photorespiration rate (Rp), dark respiration rate (Rd) and nitrogen content with the increase of soil water content. Highest values of photosynthesis parameters occurred with 80% FC with N-fertilization. Without N-fertilization, all photosynthesis parameters had the opposite trends with the increase of soil water content. Furthermore, with 30% FC the nitrogen content of seedlings with N-fertilization was significantly higher than without N-fertilization. AQY, PSII maximum photochemical efficiency (Fv/Fm) and chlorophyll and carotenoids contents was nearly the same with and without N-fertilization, but other parameters were significantly lower without N-fertilization. Thus, under N-poor soil condition J. curcas grew better under the relatively low soil water conditions and photosynthesis of J. curcas was impacted by high soil water content. While with N-fertilization, J. curcas performed better under high soil water content.
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Claims 11
Claim · model-written summary
With N-fertilization, apparent quantum yield, light compensation point and maximum net photosynthetic rate increased significantly with soil water content.
- Taxon
- Jatropha curcas
_tree_at_Samedha.jpg?width=60)
Jatropha curcast0 - Treatment
- N-fertilizatione0
- Outcome
- apparent quantum yield (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pmax)e0
- Direction
- significant increasese0
- Qualifier
- with the increase of soil water contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_tree_at_Samedha.jpg?width=500)
Verbatim
e0“With N-fertilization, we detected significant increases in apparent quantum yield (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pmax), carboxylation efficiency (CE), photorespiration rate (Rp), dark respiration rate (Rd) and nitrogen content with the increase of soil water content”
t0“Jatropha curcas seedlings”
Claim · model-written summary
With N-fertilization, carboxylation efficiency, photorespiration rate and dark respiration rate increased significantly with soil water content.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-fertilizatione0
- Outcome
- carboxylation efficiency (CE), photorespiration rate (Rp), dark respiration rate (Rd)e0
- Direction
- significant increasese0
- Qualifier
- with the increase of soil water contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With N-fertilization, we detected significant increases in apparent quantum yield (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pmax), carboxylation efficiency (CE), photorespiration rate (Rp), dark respiration rate (Rd) and nitrogen content with the increase of soil water content”
t0“Jatropha curcas seedlings”
Claim · model-written summary
With N-fertilization, nitrogen content increased significantly with soil water content.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-fertilizatione0
- Outcome
- nitrogen contente0
- Direction
- significant increasese0
- Qualifier
- with the increase of soil water contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With N-fertilization, we detected significant increases in apparent quantum yield (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pmax), carboxylation efficiency (CE), photorespiration rate (Rp), dark respiration rate (Rd) and nitrogen content with the increase of soil water content”
t0“Jatropha curcas seedlings”
Claim · model-written summary
The highest photosynthesis parameter values occurred at 80% FC with N-fertilization.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- 80% FC with N-fertilizatione1
- Outcome
- photosynthesis parameterse1
- Direction
- Highest valuese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Highest values of photosynthesis parameters occurred with 80% FC with N-fertilization”
t0“Jatropha curcas seedlings”
Claim · model-written summary
Without N-fertilization, all photosynthesis parameters decreased as soil water content increased.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- Without N-fertilizatione2
- Outcome
- all photosynthesis parameterse2
- Direction
- decreaseinferrede2
- Qualifier
- with the increase of soil water contente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Without N-fertilization, all photosynthesis parameters had the opposite trends with the increase of soil water content”
t0“Jatropha curcas seedlings”
Claim · model-written summary
At 30% FC, the nitrogen content of seedlings with N-fertilization was significantly higher than without it.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-fertilizatione3
- Outcome
- nitrogen content of seedlingse3
- Direction
- highere3
- Qualifier
- with 30% FCe3
- Comparator
- without N-fertilizatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Furthermore, with 30% FC the nitrogen content of seedlings with N-fertilization was significantly higher than without N-fertilization”
t0“Jatropha curcas seedlings”
Claim · model-written summary
With and without N-fertilization, AQY, Fv/Fm and chlorophyll and carotenoid contents were nearly the same.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-fertilizatione4
- Outcome
- AQY, PSII maximum photochemical efficiency (Fv/Fm) and chlorophyll and carotenoids contentse4
- Direction
- nearly the samee4
- Comparator
- without N-fertilizatione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“AQY, PSII maximum photochemical efficiency (Fv/Fm) and chlorophyll and carotenoids contents was nearly the same with and without N-fertilization”
t0“Jatropha curcas seedlings”
Claim · model-written summary
Other photosynthesis parameters were significantly lower without N-fertilization.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- without N-fertilizatione5
- Outcome
- other parameterse5
- Direction
- lowere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“other parameters were significantly lower without N-fertilization”
t0“Jatropha curcas seedlings”
Claim · model-written summary
Under N-poor soil, J. curcas grew better under relatively low soil water conditions.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-poor soil conditione6
- Outcome
- grewe6
- Direction
- bettere6
- Qualifier
- under the relatively low soil water conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“under N-poor soil condition J. curcas grew better under the relatively low soil water conditions”
t0“Jatropha curcas seedlings”
Claim · model-written summary
Under N-poor soil, photosynthesis of J. curcas was impacted by high soil water content.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- high soil water contente7
- Outcome
- photosynthesis of J. curcase7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“photosynthesis of J. curcas was impacted by high soil water content”
t0“Jatropha curcas seedlings”
Claim · model-written summary
With N-fertilization, J. curcas performed better under high soil water content.
- Taxon
- Jatropha curcasJatropha curcast0
- Treatment
- N-fertilizatione1
- Outcome
- performede1
- Direction
- bettere1
- Qualifier
- under high soil water contente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“While with N-fertilization, J. curcas performed better under high soil water content”
t0“Jatropha curcas seedlings”
The same questions in other papers
nitrogen · physiology: photosynthesis · Jatropha curcasPositive and negative results
2 in the opposite direction
- positive
- positive
nitrogen · nutrient: content · Jatropha curcasResults agree
2 papers in the same direction as this paper
- positive
- positive
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.