Abstract
Abstract Soybean (Glycine max L. Merr.) cv. Bragg and its supernodulating mutant nts 1007 were grown in pots containing vermiculite with a N-free nutrient solution in order to examine the effect of elevated CO2 concentration (100+20 Pa CO2 ) on biomass production, photosynthesis, and biological nitrogen fixation. The whole plant weight increase in Bragg was higher than in the mutant at a high CO2 concentration. Apparent photosynthetic activities of the upper leaves in both Bragg and the mutant increased up to 14 d after treatment initiation by the CO2 enrichment and thereafter decreased to some extent. Both leaf area and leaf thickness of Bragg increased more than in nts 1007. With the elevated CO2 concentration, biological nitrogen fixation (BNF) also responded in the same manner as biomass production in both Bragg and nts 1007. The increase of BNF in Bragg was largely due to an increase in nodule weight. Starch contents in the leaves of both Bragg and the mutant increased significantly by CO2 enrichment, with a higher increase in Bragg than in its mutant. Sugar content in leaf differed only slightly in both Bragg and the mutant. N content in leaf decreased in both Bragg and its mutant, with the decrease being more pronounced in Bragg. However, in other plant parts (roots, stem, and petiole + pods), N content increased in the mutant while in Bragg, it decreased in the pod. N accumulation rate was higher in Bragg than in the mutant and increased more in Bragg than in the mutant by CO2 enrichment. The ureide content in leaf decreased in Bragg but increased in the mutant by elevated CO2 concentration. In the nodules, ureide content increased in both Bragg and the mutant by CO2 enrichment. Based on these results, it is suggested that in terms of biomass production and photosynthetic rate, Bragg responded more to elevated CO2 concentration than its mutant nts 1007. The alleviation of the stunted vegetative growth of the mutant by CO2 enrichment was limited despite the significant increase in the photosynthetic activity, presumably due to the limitation of sink activity in the growing parts and not to insufficient supply of N through BNF.
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Claims 20
Claim · model-written summary
Whole plant weight rose more in Bragg than in the mutant under high CO2.
- Taxon
- Soybean
Glycine maxt0 - Material
- Bragge0
- Treatment
- high CO2 concentratione0
- Outcome
- whole plant weight increasee0
- Direction
- highere0
- Comparator
- the mutante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The whole plant weight increase in Bragg was higher than in the mutant at a high CO2 concentration.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Upper leaf photosynthetic activity increased to day 14 under CO2 enrichment in both lines, then declined somewhat.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- upper leavese0
- Treatment
- CO2 enrichmente0
- Outcome
- Apparent photosynthetic activitiese0
- Direction
- increasede0
- Qualifier
- up to 14 de0
- Comparator
- treatment initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent photosynthetic activities of the upper leaves in both Bragg and the mutant increased up to 14 d after treatment initiation by the CO2 enrichment and thereafter decreased to some extent.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Leaf area increased more in Bragg than nts 1007.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Outcome
- leaf areae0
- Direction
- increased moree0
- Comparator
- nts 1007e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both leaf area and leaf thickness of Bragg increased more than in nts 1007.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Leaf thickness increased more in Bragg than nts 1007.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Outcome
- leaf thicknesse0
- Direction
- increased moree0
- Comparator
- nts 1007e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both leaf area and leaf thickness of Bragg increased more than in nts 1007.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Biological nitrogen fixation responded to elevated CO2 similarly to biomass production in both lines.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragg and nts 1007e0
- Treatment
- elevated CO2 concentratione0
- Outcome
- biological nitrogen fixation (BNF)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the elevated CO2 concentration, biological nitrogen fixation (BNF) also responded in the same manner as biomass production in both Bragg and nts 1007.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Increased nodule weight largely explained increased BNF in Bragg.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Organ / stage
- nodulee0
- Outcome
- increase of BNFe0
- Direction
- increasee0
- Qualifier
- increase in nodule weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase of BNF in Bragg was largely due to an increase in nodule weight.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
CO2 enrichment significantly increased leaf starch in both lines, more in Bragg.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- CO2 enrichmente0
- Outcome
- Starch contentse0
- Direction
- increasede0
- Comparator
- the mutante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch contents in the leaves of both Bragg and the mutant increased significantly by CO2 enrichment, with a higher increase in Bragg than in its mutant.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Leaf sugar differed only slightly between Bragg and mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragg and the mutante0
- Outcome
- Sugar content in leafe0
- Direction
- differed only slightlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugar content in leaf differed only slightly in both Bragg and the mutant.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Leaf N declined in both lines, more in Bragg.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragg and its mutante0
- Outcome
- N content in leafe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N content in leaf decreased in both Bragg and its mutant, with the decrease being more pronounced in Bragg.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Root N content increased in the mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Organ / stage
- rootse0
- Outcome
- N contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in other plant parts (roots, stem, and petiole + pods), N content increased in the mutant while in Bragg, it decreased in the pod.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Stem N content increased in the mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Organ / stage
- steme0
- Outcome
- N contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in other plant parts (roots, stem, and petiole + pods), N content increased in the mutant while in Bragg, it decreased in the pod.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Petiole and pod N content increased in the mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Organ / stage
- petiole + podse0
- Outcome
- N contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in other plant parts (roots, stem, and petiole + pods), N content increased in the mutant while in Bragg, it decreased in the pod.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Pod N content decreased in Bragg.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in other plant parts (roots, stem, and petiole + pods), N content increased in the mutant while in Bragg, it decreased in the pod.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
N accumulation rate was higher in Bragg and rose more with CO2 enrichment.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Treatment
- CO2 enrichmente0
- Outcome
- N accumulation ratee0
- Direction
- increased moree0
- Comparator
- the mutante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N accumulation rate was higher in Bragg than in the mutant and increased more in Bragg than in the mutant by CO2 enrichment.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Elevated CO2 reduced leaf ureide in Bragg.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Treatment
- elevated CO2 concentratione0
- Outcome
- ureide content in leafe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ureide content in leaf decreased in Bragg but increased in the mutant by elevated CO2 concentration.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Elevated CO2 increased leaf ureide in the mutant.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Treatment
- elevated CO2 concentratione0
- Outcome
- ureide content in leafe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ureide content in leaf decreased in Bragg but increased in the mutant by elevated CO2 concentration.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
CO2 enrichment increased nodule ureide in both lines.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragg and the mutante0
- Organ / stage
- nodulese0
- Treatment
- CO2 enrichmente0
- Outcome
- ureide contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the nodules, ureide content increased in both Bragg and the mutant by CO2 enrichment.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Bragg showed a stronger biomass and photosynthetic response to elevated CO2 than nts 1007.
- Taxon
- SoybeanGlycine maxt0
- Material
- Bragge0
- Outcome
- biomass production and photosynthetic ratee0
- Direction
- responded moree0
- Comparator
- its mutant nts 1007e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on these results, it is suggested that in terms of biomass production and photosynthetic rate, Bragg responded more to elevated CO2 concentration than its mutant nts 1007.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
CO2 only partly alleviated mutant stunted growth despite higher photosynthesis.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Treatment
- CO2 enrichmente0
- Outcome
- alleviation of the stunted vegetative growthe0
- Direction
- limitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alleviation of the stunted vegetative growth of the mutant by CO2 enrichment was limited despite the significant increase in the photosynthetic activity, presumably due to the limitation of sink activity in the growing parts and not to insufficient supply of N through BNF.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
Claim · model-written summary
Limited sink activity was proposed to constrain mutant growth under CO2 enrichment.
- Taxon
- SoybeanGlycine maxt0
- Material
- the mutante0
- Outcome
- alleviation of the stunted vegetative growthe0
- Qualifier
- limitation of sink activity in the growing partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alleviation of the stunted vegetative growth of the mutant by CO2 enrichment was limited despite the significant increase in the photosynthetic activity, presumably due to the limitation of sink activity in the growing parts and not to insufficient supply of N through BNF.”
t0“Soybean cv. Bragg and its supernodulating mutant nts 1007”
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