Abstract
Greenhouse-grown, vegetative ‘Davis’ soybean plants, Glycine max (L.) Merrill, were infested with neonate larvae of the soybean looper, Pseudoplusia includens (Walker), which were allowed to defoliate the plants for 16 d. At 7, 10, 12, 14, and 16 d after infestation (DAI), plants were destructively sampled to measure plant growth and N2-fixing ability (measured using the acetylene-ethylene reduction assay). On the respective sample dates, defoliated plants suffered 13, 37, 43, 62, and 73% defoliation relative to controls. This progressive defoliation caused significant reductions in dry weight of stems by 10 DAI, and of roots and nodules by 14 DAI. Number of nodules and mean dry weight per individual nodule were not affected during the course of the experiment. N2-fixing ability was reduced significantly by 10 DAI, largely because of a significant decrease in nodule specific activity (NSA). Further decreases in N2-fixing ability at 14 and 16 DAI resulted from a combination of decreased nodule weight and decreased NSA.
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Claims 7
Claim · model-written summary
Looper infestation produced progressive soybean defoliation from 13% to 73%.
- Taxon
- soybean
Glycine maxe1 - Treatment
- defoliatede0
- Interactor
- Pseudoplusia includens
Chrysodeixis includense1pest - Outcome
- defoliatione0
- Value
- 13, 37, 43, 62, and 73%e0
- Comparator
- controlse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“defoliated plants suffered 13, 37, 43, 62, and 73% defoliation relative to controls”
e1“soybean looper, Pseudoplusia includens (Walker)”
Claim · model-written summary
Defoliation significantly reduced soybean stem dry weight by 10 days after infestation.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- progressive defoliatione0
- Outcome
- dry weight of stemse0
- Direction
- reductionse0
- Qualifier
- 10 DAIe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This progressive defoliation caused significant reductions in dry weight of stems by 10 DAI”
t0“Soybean”
Claim · model-written summary
Defoliation significantly reduced soybean root and nodule dry weights by 14 days.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- roots and nodulese0
- Direction
- reductionse0
- Qualifier
- 14 DAIe0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant reductions in dry weight of stems by 10 DAI, and of roots and nodules by 14 DAI”
t0“Soybean”
Claim · model-written summary
Nodule number and mean individual nodule dry weight were unaffected.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- Number of nodules and mean dry weight per individual nodulee0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Number of nodules and mean dry weight per individual nodule were not affected during the course of the experiment”
t0“Soybean”
Claim · model-written summary
Defoliation significantly reduced nitrogen fixation by 10 days after infestation.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- N2-fixing abilitye0
- Direction
- reducede0
- Qualifier
- 10 DAIe0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N2-fixing ability was reduced significantly by 10 DAI”
t0“Soybean”
Claim · model-written summary
Nodule specific activity decreased significantly.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- nodule specific activity (NSA)e0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant decrease in nodule specific activity (NSA)”
t0“Soybean”
Claim · model-written summary
Further nitrogen fixation declines at 14 and 16 days were linked to lower nodule weight and specific activity.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- nodulee0
- Outcome
- N2-fixing abilitye0
- Direction
- decreasese0
- Qualifier
- 14 and 16 DAIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further decreases in N2-fixing ability at 14 and 16 DAI resulted from a combination of decreased nodule weight and decreased NSA”
t0“Soybean”
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See all 7 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.