Abstract
The soybean aphid, Aphis glycines Matsumara, was discovered in the United States in the summer of 2000. Since that initial discovery, the aphid has spread across northern soybean production regions. In 2001, we examined the physiological responses of soybeans to low aphids densities (fewer than 50 aphids/leaf). In this study, we determined photosynthetic rates, leaf fluorescence responses, and photosynthetic responses to variable carbon dioxide and light levels. In addition, analyses for chlorophyll content and stable carbon isotope ratios were used to differentiate potential differences in stomatal versus mesophyll limitations to photosynthesis. We observed rate reductions of up to 50% on infested leaflets, including lealets with no apparent symptoms of aphid injury (such as chlorosis). Differences in fluorescence data indicated that photoelectron transport was not impaired. These results indicate that substantial physiological impact on soybean is possible even at low aphid densities. Also, the conventional view of aphid injury acting through reductions in chlorophyll content and light-harvesting reactions of photosynthesis is not supported by our findings in this system.
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Claims 4
Claim · model-written summary
Infested soybean leaflets showed photosynthetic rate reductions of up to 50%, including leaflets without apparent symptoms of aphid injury.
- Taxon
- soybeans
Glycine maxe1 - Treatment
- infested leafletse2
- Interactor
- Aphis glycines
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Aphis glycinese0pest - Outcome
- rate reductionse2
- Direction
- reductionse2
- Value
- up to 50%e2
- Qualifier
- including lealets with no apparent symptoms of aphid injurye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The soybean aphid, Aphis glycines Matsumara”
e1“we examined the physiological responses of soybeans to low aphids densities (fewer than 50 aphids/leaf)”
e2“We observed rate reductions of up to 50% on infested leaflets, including lealets with no apparent symptoms of aphid injury”
Claim · model-written summary
Low aphid densities did not impair photoelectron transport in soybean.
- Taxon
- soybeansGlycine maxe1
- Treatment
- low aphids densitiese1
- Interactor
- Aphis glycinesAphis glycinese0pest
- Outcome
- photoelectron transporte3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soybean aphid, Aphis glycines Matsumara”
e1“we examined the physiological responses of soybeans to low aphids densities (fewer than 50 aphids/leaf)”
e3“Differences in fluorescence data indicated that photoelectron transport was not impaired”
Claim · model-written summary
Substantial physiological impact on soybean is possible even at low aphid densities.
- Taxon
- soybeanGlycine maxe4
- Outcome
- physiological impacte4
- Qualifier
- possible even at low aphid densitiese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“These results indicate that substantial physiological impact on soybean is possible even at low aphid densities”
Claim · model-written summary
The conventional view that aphid injury reduces photosynthesis through chlorophyll content and light-harvesting reactions is not supported in soybean.
- Taxon
- soybeanGlycine maxe4
- Outcome
- photosynthesise5
- Qualifier
- acting through reductions in chlorophyll content and light-harvesting reactions of photosynthesise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“These results indicate that substantial physiological impact on soybean is possible even at low aphid densities”
e5“the conventional view of aphid injury acting through reductions in chlorophyll content and light-harvesting reactions of photosynthesis is not supported by our findings in this system”
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.