Abstract
Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules. Gradual drought stress, imposed by withholding water nutrients, resulted in declines in the water potential of leaves and nodules consistent with a significant decline in N2 fixation. However, the amounts of nitrogenase components 1 and 2 were virtually unaffected by drought stress. Similarly, no significant changes could be detected in aspartate aminotransferase, phosphoenolpyruvate carboxylase, glutamine synthetase or alkaline invertase activities throughout the experiment. In contrast, sucrose synthase (SS), one of the enzymes involved in sucrose metabolism in legume nodules, declined dramatically in activity and in content within a few days of withholding water. Coincident with this decline in SS activity were significant increases in the nodule contents of sucrose, total free amino acids and ureides. The amounts of proline, however, did not increase until some days later. It is suggested that SS may play a key role in the regulation of nodule carbon metabolism and, therefore, of nitrogen fixation under drought stress conditions.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Gradual drought stress resulted in declines in the water potential of leaves and nodules of soybean.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Gradual drought stresse1
- Outcome
- water potential of leaves and nodulese1
- Direction
- declinese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e1“Gradual drought stress, imposed by withholding water nutrients, resulted in declines in the water potential of leaves and nodules consistent with a significant decline in N2 fixation”
Claim · model-written summary
Gradual drought stress significantly decreased N2 fixation in soybean nodules.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Gradual drought stresse1
- Outcome
- N2 fixatione1
- Direction
- declinee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e1“Gradual drought stress, imposed by withholding water nutrients, resulted in declines in the water potential of leaves and nodules consistent with a significant decline in N2 fixation”
Claim · model-written summary
Drought stress left the amounts of nitrogenase components 1 and 2 in soybean nodules virtually unaffected.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse2
- Outcome
- amounts of nitrogenase components 1 and 2e2
- Direction
- virtually unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e2“However, the amounts of nitrogenase components 1 and 2 were virtually unaffected by drought stress”
Claim · model-written summary
Drought stress caused no significant changes in aspartate aminotransferase, phosphoenolpyruvate carboxylase or glutamine synthetase activities in soybean nodules.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- aspartate aminotransferase, phosphoenolpyruvate carboxylase, glutamine synthetasee3
- Direction
- no significant changese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e3“Similarly, no significant changes could be detected in aspartate aminotransferase, phosphoenolpyruvate carboxylase, glutamine synthetase or alkaline invertase activities throughout the experiment”
Claim · model-written summary
Drought stress caused no significant change in alkaline invertase activity in soybean nodules.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- alkaline invertase activitiese3
- Direction
- no significant changese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e3“Similarly, no significant changes could be detected in aspartate aminotransferase, phosphoenolpyruvate carboxylase, glutamine synthetase or alkaline invertase activities throughout the experiment”
Claim · model-written summary
Withholding water sharply reduced sucrose synthase activity and content in soybean nodules within a few days.
- Taxon
- soybeanGlycine maxe0
- Treatment
- withholding watere4
- Gene
- sucrose synthase (SS)e4
- Outcome
- in activity and in contente4
- Direction
- declined dramaticallye4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e4“In contrast, sucrose synthase (SS), one of the enzymes involved in sucrose metabolism in legume nodules, declined dramatically in activity and in content within a few days of withholding water”
Claim · model-written summary
Decline in sucrose synthase activity coincided with significant increases in nodule contents of sucrose, total free amino acids and ureides in soybean.
- Taxon
- soybeanGlycine maxe0
- Gene
- SSe5
- Outcome
- nodule contents of sucrose, total free amino acids and ureidese5
- Direction
- significant increasese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e5“Coincident with this decline in SS activity were significant increases in the nodule contents of sucrose, total free amino acids and ureides”
Claim · model-written summary
Under drought stress, proline in soybean nodules did not increase until some days later.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- amounts of prolinee6
- Direction
- did not increase until some days latere6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e6“The amounts of proline, however, did not increase until some days later”
Claim · model-written summary
Sucrose synthase is suggested to regulate nodule carbon metabolism and, through it, nitrogen fixation under drought in soybean.
- Taxon
- soybeanGlycine maxe0
- Gene
- SSe7
- Outcome
- regulation of nodule carbon metabolisme7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experiments were carried out to investigate the effects of drought stress on enzymatic activities related to carbon and nitrogen metabolism in soybean nodules”
e7“It is suggested that SS may play a key role in the regulation of nodule carbon metabolism and, therefore, of nitrogen fixation under drought stress conditions”
The same questions in other papers
drought · physiology: enzyme activity · Glycine max (soybean)Results differ
17 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- positive
20 papers more in this group
See all 24 papers →drought · symbiosis · Glycine max (soybean)Results differ
38 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- negative
37 papers more in this group
See all 41 papers →drought · molecular: metabolites · Glycine max (soybean)Positive and negative results
39 papers in the same direction as this paper · 20 in the opposite direction
- negative
- positive
- positive
56 papers more in this group
See all 60 papers →drought · physiology: water · Glycine max (soybean)Positive and negative results
56 papers in the same direction as this paper · 20 in the opposite direction
- positive
- positive
- positive
73 papers more in this group
See all 77 papers →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.