Abstract
14 CO 2 assimilation, photosynthate distribution, stomatal resistance, and acetylene reduction activity of vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’] were examined 3 hours after pulse labeling the leaves with 14 CO 2 . The plants had previously been water stressed for 20 hours by polyethylene glycol additions to the culture solution. Photosynthetic CO 2 exchange rate (CER) and acytelene reduction activity of control and water stressed soybean plants were also monitored for 6 hours following polyethylene glycol induced water stress. 14 CO 2 assimilation and specific nodule activity (SNA) decreased and stomatal resistance (r 8 ) increased with increasing water stress in the 14 CO 2 labeling experiment. There was a significant negative correlation (r=−0.71) between SNA and r 8 • Dry weights of leaves, of stems plus petioles, and of nodules were significantly decreased in the water stress treatments, while root dry weights increased. Water stress resulted in a redistribution of 14 C with a greater proportion of the 14 C being translocated to the roots and nodules at the expense of the leaves. In the time course study, CER decreased after the imposition of an abrupt water stress (−12 bar), but total nodule activity was not affected. It is suggested that in. hibition of nodule activity under long term water stress was not caused solely by the decreased CER, but also by changes in photosynthate pool sizes.
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Claims 12
Claim · model-written summary
Soybean carbon assimilation decreased with increasing water stress.
- Taxon
- soybean
Glycine maxe1 - Material
- ‘Clay’e1
- Treatment
- water stresse0
- Outcome
- 14 CO 2 assimilatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“14 CO 2 assimilation and specific nodule activity (SNA) decreased and stomatal resistance (r 8 ) increased with increasing water stress”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Soybean specific nodule activity decreased with increasing water stress.
- Taxon
- soybeanGlycine maxe1
- Material
- ‘Clay’e1
- Treatment
- water stresse0
- Outcome
- specific nodule activity (SNA)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“14 CO 2 assimilation and specific nodule activity (SNA) decreased and stomatal resistance (r 8 ) increased with increasing water stress”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Soybean stomatal resistance increased with increasing water stress.
- Taxon
- soybeanGlycine maxe1
- Material
- ‘Clay’e1
- Treatment
- water stresse0
- Outcome
- stomatal resistance (r 8 )e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“14 CO 2 assimilation and specific nodule activity (SNA) decreased and stomatal resistance (r 8 ) increased with increasing water stress”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Specific nodule activity and stomatal resistance had a significant negative correlation.
- Taxon
- soybeanGlycine maxe1
- Outcome
- specific nodule activity (SNA)e2
- Direction
- negative correlatione0
- Value
- r=−0.71e0
- Comparator
- stomatal resistance (r 8 )e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant negative correlation (r=−0.71) between SNA and r 8”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
e2“specific nodule activity (SNA) decreased and stomatal resistance (r 8 ) increased”
Claim · model-written summary
Water stress significantly decreased soybean leaf dry weight.
- Taxon
- soybeanGlycine maxe1
- Treatment
- water stress treatmentse0
- Outcome
- Dry weights of leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of leaves, of stems plus petioles, and of nodules were significantly decreased in the water stress treatments”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Water stress significantly decreased soybean stem and petiole dry weight.
- Taxon
- soybeanGlycine maxe1
- Treatment
- water stress treatmentse0
- Outcome
- stems plus petiolese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of leaves, of stems plus petioles, and of nodules were significantly decreased in the water stress treatments”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Water stress significantly decreased soybean nodule dry weight.
- Taxon
- soybeanGlycine maxe1
- Treatment
- water stress treatmentse0
- Outcome
- nodulese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weights of leaves, of stems plus petioles, and of nodules were significantly decreased in the water stress treatments”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Water stress increased soybean root dry weight.
- Taxon
- soybeanGlycine maxe2
- Treatment
- water stress treatmentse1
- Outcome
- root dry weightse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while root dry weights increased”
e1“in the water stress treatments”
e2“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Water stress shifted a greater proportion of assimilated carbon to soybean roots and nodules at the expense of leaves.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Water stresse0
- Outcome
- proportion of the 14 C being translocated to the roots and nodulese0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress resulted in a redistribution of 14 C with a greater proportion of the 14 C being translocated to the roots and nodules at the expense of the leaves”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Abrupt water stress decreased soybean photosynthetic carbon exchange rate.
- Taxon
- soybeanGlycine maxe1
- Treatment
- abrupt water stress (−12 bar)e0
- Outcome
- CERe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CER decreased after the imposition of an abrupt water stress (−12 bar)”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
Abrupt water stress did not affect total soybean nodule activity in the time course study.
- Taxon
- soybeanGlycine maxe2
- Treatment
- abrupt water stress (−12 bar)e1
- Outcome
- total nodule activitye0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but total nodule activity was not affected”
e1“abrupt water stress (−12 bar)”
e2“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
Claim · model-written summary
The authors suggest that long term water stress inhibited nodule activity through changes in photosynthate pool sizes as well as reduced carbon exchange.
- Taxon
- soybeanGlycine maxe1
- Treatment
- long term water stresse0
- Outcome
- nodule activitye0
- Qualifier
- changes in photosynthate pool sizese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in. hibition of nodule activity under long term water stress was not caused solely by the decreased CER, but also by changes in photosynthate pool sizes”
e1“vegetative soybean plants [ Glycine max (L.) Merr., var. ‘Clay’]”
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