Abstract
Knowledge of soybean aphid ( Aphis glycines Matsumura) effects on soybean [ Glycine max (L.) Merr.] shoot N components may improve understanding of how plants are injured by this invasive pest. This 2‐yr field study was conducted to measure soybean aphid effects (initial infestation of 0, 10, 50, or 100 aphids plant −1 at the fifth node [V5] stage) on cumulative aphid‐days as well as resulting soybean aphid populations plant −1 , shoot dry weight (DW), nitrate N, and ureide N measured at full bloom (R2), beginning pod (R4), full pod (R5), and beginning seed (R6). Cumulative aphid‐days, which quantifies both the number of aphids present on plants and the duration of their feeding time, were similar across initial aphid infestation treatments. Compared with control plants, aphid feeding injury reduced shoot DW by about 40% and increased shoot nitrate N concentrations by about 45% across all initial infestation rates tested. Shoot nitrate N accumulation was increased about 20% by the 10 aphids plant −1 treatment. In contrast, shoot ureide N concentrations in aphid‐injured plants were similar to levels observed for uninjured plants. This lack of a concentration effect resulted in about a 36% decrease in ureide N accumulation in aphid‐injured plants. These differential responses may result because nitrate N can be absorbed directly from the soil solution while ureide N biosynthesis has a higher energy requirement that cannot be met under severe aphid infestations.
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Claims 6
Claim · model-written summary
Aphid feeding injury reduced soybean shoot dry weight by about 40%.
- Taxon
- soybean
Glycine maxe0 - Treatment
- aphid feeding injurye1
- Interactor
- Aphis glycines
.jpg?width=60)
Aphis glycinese0pest - Outcome
- shoot DWe1
- Direction
- reducede1
- Value
- about 40%e1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e1“Compared with control plants, aphid feeding injury reduced shoot DW by about 40% and increased shoot nitrate N concentrations by about 45% across all initial infestation rates tested”
Claim · model-written summary
Aphid feeding injury increased soybean shoot nitrate N concentrations by about 45%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- aphid feeding injurye1
- Interactor
- Aphis glycinesAphis glycinese0pest
- Outcome
- shoot nitrate N concentrationse1
- Direction
- increasede1
- Value
- about 45%e1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e1“Compared with control plants, aphid feeding injury reduced shoot DW by about 40% and increased shoot nitrate N concentrations by about 45% across all initial infestation rates tested”
Claim · model-written summary
Ten aphids per plant increased soybean shoot nitrate N accumulation by about 20%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- 10 aphids plant −1e2
- Interactor
- aphidsAphidomorphae2pest
- Outcome
- Shoot nitrate N accumulatione2
- Direction
- increasede2
- Value
- about 20%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e2“Shoot nitrate N accumulation was increased about 20% by the 10 aphids plant −1 treatment”
Claim · model-written summary
Shoot ureide N concentrations in aphid-injured soybean were similar to those of uninjured plants.
- Taxon
- soybeanGlycine maxe0
- Treatment
- aphid‐injured plantse3
- Interactor
- Aphis glycinesAphis glycinese0pest
- Outcome
- shoot ureide N concentrationse3
- Direction
- similare3
- Comparator
- uninjured plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e3“In contrast, shoot ureide N concentrations in aphid‐injured plants were similar to levels observed for uninjured plants”
Claim · model-written summary
Ureide N accumulation in aphid-injured soybean decreased by about 36%.
- Taxon
- soybeanGlycine maxe0
- Treatment
- aphid‐injured plantse4
- Interactor
- Aphis glycinesAphis glycinese0pest
- Outcome
- ureide N accumulatione4
- Direction
- decreasee4
- Value
- 36%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e4“This lack of a concentration effect resulted in about a 36% decrease in ureide N accumulation in aphid‐injured plants”
Claim · model-written summary
Cumulative aphid-days were similar across the initial aphid infestation treatments.
- Taxon
- soybeanGlycine maxe0
- Interactor
- Aphis glycinesAphis glycinese0pest
- Outcome
- Cumulative aphid‐dayse5
- Qualifier
- similar across initial aphid infestation treatmentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean aphid ( Aphis glycines Matsumura) effects on soybean”
e5“Cumulative aphid‐days, which quantifies both the number of aphids present on plants and the duration of their feeding time, were similar across initial aphid infestation treatments”
The same questions in other papers
infection · Aphis glycines · Glycine max (soybean)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 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.