Abstract
Previous research has demonstrated that glyphosate can affect nitrogen fixation or nitrogen assimilation in soybean. This 2-year field study investigated the effects of glyphosate application of 1.12 and 3.36 kg of ae ha(-1) on nitrogen metabolism and seed composition in glyphosate-resistant (GR) soybean. There was no effect of glyphosate application on nitrogen fixation as measured by acetylene reduction assay, soybean yield, or seed nitrogen content. However, there were significant effects of glyphosate application on nitrogen assimilation, as measured by in vivo nitrate reductase activity (NRA) in leaves, roots, and nodules, especially at high rate. Transiently lower leaf nitrogen or (15)N natural abundance in high glyphosate application soybean supports the inhibition of NRA. With the higher glyphosate application level protein was significantly higher (10.3%) in treated soybean compared to untreated soybean. Inversely, total oil and linolenic acid were lowest at the high glyphosate application rate, but oleic acid was greatest (22%) in treated soybean. These results suggest that nitrate assimilation in GR soybean was more affected than nitrogen fixation by glyphosate application and that glyphosate application may alter nitrogen and carbon metabolism.
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 5
Claim · model-written summary
Glyphosate application had no effect on nitrogen fixation, soybean yield or seed nitrogen content.
- Taxon
- soybean
Glycine maxe1 - Treatment
- glyphosate applicatione1
- Outcome
- nitrogen fixation as measured by acetylene reduction assay, soybean yield, or seed nitrogen contente1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“There was no effect of glyphosate application on nitrogen fixation as measured by acetylene reduction assay, soybean yield, or seed nitrogen content”
Claim · model-written summary
Glyphosate application significantly decreased in vivo nitrate reductase activity in leaves, roots and nodules, especially at high rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glyphosate applicatione2
- Outcome
- in vivo nitrate reductase activity (NRA) in leaves, roots, and nodulese2
- Direction
- decreaseinferrede2
- Qualifier
- especially at high ratee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“there were significant effects of glyphosate application on nitrogen assimilation, as measured by in vivo nitrate reductase activity (NRA) in leaves, roots, and nodules, especially at high rate”
t0“Glyphosate-Resistant Soybean”
Claim · model-written summary
Higher glyphosate application raised seed protein by 10.3% relative to untreated soybean.
- Taxon
- soybeanGlycine maxe3
- Treatment
- higher glyphosate application levele3
- Outcome
- proteine3
- Direction
- highere3
- Value
- 10.3%e3
- Comparator
- untreated soybeane3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“With the higher glyphosate application level protein was significantly higher (10.3%) in treated soybean compared to untreated soybean”
t0“Glyphosate-Resistant Soybean”
Claim · model-written summary
Total oil and linolenic acid were lowest at the high glyphosate application rate.
- Taxon
- soybeanGlycine maxe4
- Treatment
- high glyphosate application ratee4
- Outcome
- total oil and linolenic acide4
- Direction
- loweste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Inversely, total oil and linolenic acid were lowest at the high glyphosate application rate, but oleic acid was greatest (22%) in treated soybean”
Claim · model-written summary
Oleic acid was greatest (22%) in glyphosate-treated soybean.
- Taxon
- soybeanGlycine maxe4
- Treatment
- glyphosate applicatione4
- Outcome
- oleic acide4
- Direction
- greateste4
- Value
- 22%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Inversely, total oil and linolenic acid were lowest at the high glyphosate application rate, but oleic acid was greatest (22%) in treated soybean”
The same questions in other papers
glyphosate · quality: protein · Glycine max (soybean)Results differ
2 in the opposite direction
- no effect
- no effect
glyphosate · symbiosis · Glycine max (soybean)Results differ
7 papers in the same direction as this paper
- negative
- negative
- negative
4 papers more in this group
See all 8 papers →glyphosate · physiology: enzyme activity · Glycine max (soybean)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.