Abstract
ABSTRACT There is little information available about soybean aphid (Aphis glycines Matsumura) effects on the physiology and mineral nutrition of soybean (Glycine max [L.] merr.). Controlled-environment studies were conducted to measure soybean aphid infestation effects on dry weight, nitrogen (N) fixation, ureide-N, and nitrate-N concentration and accumulation. Plants grown in perlite using –N nutrient solution culture were infested at the 3rd trifoliolate (V3) stage and measured for N fixation, nodule characteristics, and ureide-N concentration at the full pod (R4) stage. When compared to uninfested control plants, aphid infestation reduced total nodule volume per plant by 34%, nodule leghemoglobin per plant by 31%, plant N fixation rate by 80% and shoot ureide-N concentration by 20%. Soil-grown plants were infested at the first trifoliolate (V1) stage and shoots were measured for dry weight, nitrate-N, and ureide-N at the full bloom (R2) stage. Infestation reduced shoot dry weight by 63%, increased nitrate-N concentration by 75%, but did not significantly affect ureide-N concentration. Because nutrient concentration is a single-point measurement that results from the integration of two dynamic processes, nutrient accumulation and dry matter production, we conclude that aphid-induced reductions in N fixation, coupled with decreased dry weight accumulation, caused shoot ureide-N concentration to remain unchanged in aphid-injured plants when compared to uninfested plants. Because nitrate-N concentration was greater in aphid-damaged shoot tissue, we further conclude that nitrate-N accumulation was less sensitive to aphid injury than dry weight accumulation.
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Claims 9
Claim · model-written summary
Aphid infestation reduced total nodule volume per plant by 34%.
- Taxon
- soybean
Glycine maxt0 - Treatment
- aphid infestatione0
- Interactor
- soybean aphid
.jpg?width=60)
Aphis glycinest0pest - Outcome
- total nodule volume per plante0
- Direction
- reducede0
- Value
- 34%e0
- Comparator
- uninfested control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“aphid infestation reduced total nodule volume per plant by 34%”
e1“When compared to uninfested control plants”
t0“Soybean Aphid”
Claim · model-written summary
Aphid infestation reduced nodule leghemoglobin per plant by 31%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- aphid infestatione1
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- nodule leghemoglobin per plante0
- Direction
- reducede1
- Value
- 31%e0
- Comparator
- uninfested control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nodule leghemoglobin per plant by 31%”
e1“When compared to uninfested control plants, aphid infestation reduced”
t0“Soybean Aphid”
Claim · model-written summary
Aphid infestation reduced plant N fixation rate by 80%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- aphid infestatione1
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- plant N fixation ratee0
- Direction
- reducede1
- Value
- 80%e0
- Comparator
- uninfested control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant N fixation rate by 80%”
e1“When compared to uninfested control plants, aphid infestation reduced”
t0“Soybean Aphid”
Claim · model-written summary
Aphid infestation reduced shoot ureide-N concentration by 20%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- aphid infestatione1
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- shoot ureide-N concentratione0
- Direction
- reducede1
- Value
- 20%e0
- Comparator
- uninfested control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot ureide-N concentration by 20%”
e1“When compared to uninfested control plants, aphid infestation reduced”
t0“Soybean Aphid”
Claim · model-written summary
Infestation reduced shoot dry weight by 63%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Infestatione0
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- shoot dry weighte0
- Direction
- reducede0
- Value
- 63%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infestation reduced shoot dry weight by 63%”
t0“Soybean Aphid”
Claim · model-written summary
Infestation increased shoot nitrate-N concentration by 75%.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Infestatione1
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- nitrate-N concentratione0
- Direction
- increasede0
- Value
- 75%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased nitrate-N concentration by 75%”
e1“Infestation reduced shoot dry weight”
t0“Soybean Aphid”
Claim · model-written summary
Infestation did not significantly affect shoot ureide-N concentration in soil-grown plants.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Infestatione1
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- ureide-N concentratione0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but did not significantly affect ureide-N concentration”
e1“Infestation reduced shoot dry weight”
t0“Soybean Aphid”
Claim · model-written summary
Authors attribute unchanged shoot ureide-N concentration to reduced N fixation coupled with decreased dry weight accumulation.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- shoot ureide-N concentration to remain unchangede0
- Qualifier
- reductions in N fixation, coupled with decreased dry weight accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aphid-induced reductions in N fixation, coupled with decreased dry weight accumulation, caused shoot ureide-N concentration to remain unchanged”
t0“Soybean Aphid”
Claim · model-written summary
Authors infer nitrate-N accumulation was less sensitive to aphid injury than dry weight accumulation.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- Soybean AphidAphis glycinest0pest
- Outcome
- nitrate-N accumulatione0
- Direction
- less sensitivee0
- Comparator
- dry weight accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate-N accumulation was less sensitive to aphid injury than dry weight accumulation”
t0“Soybean Aphid”
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
- negative
- 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.