Abstract
Abstract In the last years, the atmospheric CO 2 concentration has increased significantly, and this increase can cause changes in various physiological and biochemical processes of plants. However, the response of plants to elevated CO 2 concentration (e[CO 2 ]) will be different depending on the nitrogen form available and the plant species. Therefore, hydroponic trials on cucumber plants, with two CO 2 concentrations (400 and 1000 ppm) and two nitrogen sources (NO 3 − /NH 4 + ; 100/0 and 90/10), were conducted. Physiological parameters—such as gas exchange, GS, GOGAT and GDH activities, cation composition, soluble sugar and starch content- were measured. The results showed that when plants were grown with NH 4 + and e[CO 2 ], parameters such as photosynthesis rate (A CO2 ), instantaneous water use efficiency (WUEi), the content of NH 4 + , Ca 2+ and Mg 2+ , and the concentration of starch, were higher than in control plants (irrigated with nitrate as sole nitrogen source and ambient CO 2 concentration (a[CO 2 ])). Furthermore, an improvement in N assimilation was observed when the GS/GOGAT pathway was enhanced under these conditions (NH 4 + and e[CO 2 ]). Thus, our results contribute to the reduction of the negative environmental impacts of the use of nitrogen fertilizers on this crop, both by reducing nitrogen leakage (eutrophication) and greenhouse gas emissions.
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Claims 7
Claim · model-written summary
In cucumber grown with NH4+ and elevated CO2, photosynthesis rate was higher than in control plants.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- NH 4 + and e[CO 2 ]e1
- Outcome
- photosynthesis ratee2
- Direction
- highere3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“when plants were grown with NH 4 + and e[CO 2 ]”
e2“photosynthesis rate”
e3“were higher than in control plants”
Claim · model-written summary
In cucumber grown with NH4+ and elevated CO2, instantaneous water use efficiency was higher than in control plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NH 4 + and e[CO 2 ]e1
- Outcome
- instantaneous water use efficiencye4
- Direction
- highere3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“when plants were grown with NH 4 + and e[CO 2 ]”
e3“were higher than in control plants”
e4“instantaneous water use efficiency”
Claim · model-written summary
In cucumber grown with NH4+ and elevated CO2, the content of NH4+ was higher than in control plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NH 4 + and e[CO 2 ]e1
- Outcome
- the content of NH 4 +e5
- Direction
- highere3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“when plants were grown with NH 4 + and e[CO 2 ]”
e3“were higher than in control plants”
e5“the content of NH 4 +”
Claim · model-written summary
In cucumber grown with NH4+ and elevated CO2, Ca2+ and Mg2+ contents were higher than in control plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NH 4 + and e[CO 2 ]e1
- Outcome
- Ca 2+ and Mg 2+e6
- Direction
- highere3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“when plants were grown with NH 4 + and e[CO 2 ]”
e3“were higher than in control plants”
e6“Ca 2+ and Mg 2+”
Claim · model-written summary
In cucumber grown with NH4+ and elevated CO2, the concentration of starch was higher than in control plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NH 4 + and e[CO 2 ]e1
- Outcome
- the concentration of starche7
- Direction
- highere3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“when plants were grown with NH 4 + and e[CO 2 ]”
e3“were higher than in control plants”
e7“the concentration of starch”
Claim · model-written summary
An improvement in N assimilation was observed in cucumber when the GS/GOGAT pathway was enhanced under NH4+ and elevated CO2.
- Taxon
- cucumberCucumis sativust0
- Treatment
- NH 4 + and e[CO 2 ]e1
- Gene
- GS/GOGATe1
- Outcome
- N assimilatione1
- Direction
- improvemente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“an improvement in N assimilation was observed when the GS/GOGAT pathway was enhanced under these conditions (NH 4 + and e[CO 2 ])”
Claim · model-written summary
The authors conclude that their results contribute to reducing the negative environmental impacts of nitrogen fertilizer use on cucumber.
- Taxon
- cucumberCucumis sativust0
- Outcome
- reduction of the negative environmental impacts of the use of nitrogen fertilizerse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cucumber (Cucumis sativus L.)”
e1“our results contribute to the reduction of the negative environmental impacts of the use of nitrogen fertilizers on this crop”
The same questions in other papers
co2 · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
19 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
18 papers more in this group
See all 22 papers →co2 · physiology: water · Cucumis sativus (cucumber)Results agree
3 papers in the same direction as this paper
- positive
- 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.