Abstract
【Objective】 The objective of the experimentis to investigate the effect of rhizosphere CO2 concentration on growth and development of muskmelon.【Method】 By the aeroponics culture system,the effects of rhizosphere different CO2 concentration on plant growth and root nitrogen metabolism of muskmelon were studied during anthesis and fruiting periods.【Result】 The results showed that in treatments with CO2 concentrations at 2 500 and 5 000 μL·L-1,plant growth was significantly inhibited,the content of NO3--N and NH4+-N and the activity of nitrate reductase (NR) and glutamate dehydrogenase (GDH) in root were higher than that the 350 μL·L-1 (control) at the initial stage of treatment.Moreover,the increment in treatments with 5 000 μL·L-1 CO2 was larger than that with 2 500 μL·L-1 CO2.The activity of NR decreased rapidly and then reached that in the control,NO3--N content,NH4+-N content and the activity of GDH were decreased with treatment time progressed.The soluble protein content,the activity of glutamine synthetase (GS),glutamic acid oxaloacetate transa-minase (GOT),glutamic acid-pyruvic acid transaminase (GPT),the content of total amino acid and the major part amino acid in xylem sap were decreased with the increasing rhizosphere CO2 concentration over the treatment time.【 Conclusion】 It was concluded that the uptake of nitrogen,assimilation,amino acid synthesis and transporation were inhibited in root when the rhizosphere CO2 concentration reached 2 500 μL·L-1 in fruit development period of muskmelon,which resulted the decrease of the ability of nitrogen metabolism and the level of plant nitrogen cycle.
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Claims 12
Claim · model-written summary
Rhizosphere CO2 at 2 500 and 5 000 μL·L-1 significantly inhibited muskmelon growth versus 350 μL·L-1 control.
- Taxon
- muskmelon
.jpg?width=60)
Cucumis melot0 - Treatment
- CO2 concentrations at 2 500 and 5 000 μL·L-1e0
- Outcome
- plant growthe0
- Direction
- inhibitede0
- Comparator
- 350 μL·L-1 (control)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“in treatments with CO2 concentrations at 2 500 and 5 000 μL·L-1,plant growth was significantly inhibited”
e1“350 μL·L-1 (control)”
t0“muskmelon”
Claim · model-written summary
Initial root NO3--N and NH4+-N contents were higher at elevated rhizosphere CO2 than at 350 μL·L-1 control.
- Taxon
- muskmelonCucumis melot0
- Organ / stage
- roote0
- Treatment
- CO2 concentrations at 2 500 and 5 000 μL·L-1e1
- Outcome
- content of NO3--N and NH4+-Ne0
- Direction
- highere0
- Qualifier
- at the initial stage of treatmente0
- Comparator
- 350 μL·L-1 (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of NO3--N and NH4+-N and the activity of nitrate reductase (NR) and glutamate dehydrogenase (GDH) in root were higher than that the 350 μL·L-1 (control) at the initial stage of treatment”
e1“CO2 concentrations at 2 500 and 5 000 μL·L-1”
t0“muskmelon”
Claim · model-written summary
Initial root NR and GDH activities were higher at elevated rhizosphere CO2 than at control.
- Taxon
- muskmelonCucumis melot0
- Organ / stage
- roote0
- Treatment
- CO2 concentrations at 2 500 and 5 000 μL·L-1e1
- Outcome
- activity of nitrate reductase (NR) and glutamate dehydrogenase (GDH)e0
- Direction
- highere0
- Comparator
- 350 μL·L-1 (control)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of NO3--N and NH4+-N and the activity of nitrate reductase (NR) and glutamate dehydrogenase (GDH) in root were higher than that the 350 μL·L-1 (control) at the initial stage of treatment”
e1“CO2 concentrations at 2 500 and 5 000 μL·L-1”
t0“muskmelon”
Claim · model-written summary
The initial nitrogen metabolism increment at 5 000 μL·L-1 CO2 exceeded that at 2 500 μL·L-1.
- Taxon
- muskmelonCucumis melot0
- Treatment
- 5 000 μL·L-1 CO2e0
- Outcome
- incremente0
- Direction
- largere0
- Comparator
- 2 500 μL·L-1 CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increment in treatments with 5 000 μL·L-1 CO2 was larger than that with 2 500 μL·L-1 CO2”
t0“muskmelon”
Claim · model-written summary
Root NR activity fell rapidly over time and then reached control level.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of NR decreased rapidly and then reached that in the control”
t0“muskmelon”
Claim · model-written summary
Root NO3--N and NH4+-N contents declined as CO2 treatment time progressed.
- Taxon
- muskmelonCucumis melot0
- Outcome
- NO3--N content,NH4+-N contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3--N content,NH4+-N content and the activity of GDH were decreased with treatment time progressed”
t0“muskmelon”
Claim · model-written summary
Root GDH activity declined as CO2 treatment time progressed.
- Taxon
- muskmelonCucumis melot0
- Gene
- GDHe0
- Outcome
- activity of GDHe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NO3--N content,NH4+-N content and the activity of GDH were decreased with treatment time progressed”
t0“muskmelon”
Claim · model-written summary
Soluble protein content decreased with increasing rhizosphere CO2 over treatment time.
- Taxon
- muskmelonCucumis melot0
- Treatment
- increasing rhizosphere CO2 concentratione0
- Outcome
- soluble protein contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soluble protein content,the activity of glutamine synthetase (GS),glutamic acid oxaloacetate transa-minase (GOT),glutamic acid-pyruvic acid transaminase (GPT),the content of total amino acid and the major part amino acid in xylem sap were decreased with the increasing rhizosphere CO2 concentration over the treatment time”
t0“muskmelon”
Claim · model-written summary
Activities of GS, GOT and GPT decreased with increasing rhizosphere CO2 over treatment time.
- Taxon
- muskmelonCucumis melot0
- Treatment
- increasing rhizosphere CO2 concentratione0
- Outcome
- activity of glutamine synthetase (GS),glutamic acid oxaloacetate transa-minase (GOT),glutamic acid-pyruvic acid transaminase (GPT)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soluble protein content,the activity of glutamine synthetase (GS),glutamic acid oxaloacetate transa-minase (GOT),glutamic acid-pyruvic acid transaminase (GPT),the content of total amino acid and the major part amino acid in xylem sap were decreased with the increasing rhizosphere CO2 concentration over the treatment time”
t0“muskmelon”
Claim · model-written summary
Total and major amino acid contents in xylem sap decreased with increasing rhizosphere CO2.
- Taxon
- muskmelonCucumis melot0
- Treatment
- increasing rhizosphere CO2 concentratione0
- Outcome
- content of total amino acid and the major part amino acid in xylem sape0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the content of total amino acid and the major part amino acid in xylem sap were decreased with the increasing rhizosphere CO2 concentration over the treatment time”
t0“muskmelon”
Claim · model-written summary
The authors concluded that rhizosphere CO2 at 2 500 μL·L-1 during fruit development inhibited root nitrogen uptake, assimilation, amino acid synthesis and transport.
- Taxon
- muskmelonCucumis meloe0
- Organ / stage
- roote0
- Treatment
- rhizosphere CO2 concentration reached 2 500 μL·L-1e0
- Outcome
- uptake of nitrogen,assimilation,amino acid synthesis and transporatione0
- Direction
- inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the uptake of nitrogen,assimilation,amino acid synthesis and transporation were inhibited in root when the rhizosphere CO2 concentration reached 2 500 μL·L-1 in fruit development period of muskmelon”
Claim · model-written summary
The authors attributed reduced root nitrogen metabolism and plant nitrogen cycling to elevated CO2.
- Taxon
- muskmelonCucumis meloe1
- Treatment
- rhizosphere CO2 concentration reached 2 500 μL·L-1e1
- Outcome
- ability of nitrogen metabolism and the level of plant nitrogen cyclee0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease of the ability of nitrogen metabolism and the level of plant nitrogen cycle”
e1“rhizosphere CO2 concentration reached 2 500 μL·L-1 in fruit development period of muskmelon”
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