Abstract
, is the most damaging pathogen of soybean. Use of resistant cultivars is an effective strategy to manage SCN, but it also selects for virulent populations over time. A 12-year field experiment was initiated in 2003 to study how tillage and 11 different sequences of four cultivars impact SCN population dynamics and virulence. An SCN-susceptible cultivar and three resistant cultivars (R1, R2, and R3 derived from cultivars PI 88788, Peking, and PI 437654, respectively) were used. Tillage had minimal effect on SCN population density. Compared with no till, conventional tillage resulted in a faster increase of SCN virulence to Peking when the SCN was selected by R2 and virulence to PI 88788 by R3. Among the three SCN-resistant cultivars, R1 supported the greatest population density, R2 supported intermediate population density, and R3 supported the least SCN population density. The SCN populations selected by R1 overcame the resistance in PI 88788 but not in Peking and PI 437654. R2 selected SCN populations that overcame the resistance in Peking but not in PI 88788 and PI 437654. In contrast, R3 selected SCN populations that overcame both PI 88788 and Peking sources of resistance. There was no increase of virulence to PI 437654 in any cultivar sequence. R1 in rotation with R2 or R3 had a negative effect on female index on Peking. Susceptible soybean reduced SCN virulence to Peking, indicating that there was fitness cost of the Peking virulent SCN type. These results suggest that rotation of Peking with PI 88788 is a good strategy for managing the SCN, and susceptible cultivar and no till may reduce SCN virulence selection pressure in some rotations.[Formula: see text] Copyright © 2020 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Claims 16
Claim · model-written summary
Tillage had minimal effect on soybean cyst nematode population density.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Tillagee0
- Outcome
- SCN population densitye0
- Direction
- minimal effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage had minimal effect on SCN population density”
t0“Soybean”
Claim · model-written summary
Conventional tillage increased SCN virulence to Peking faster than no till under R2 selection.
- Taxon
- SoybeanGlycine maxt0
- Material
- R2e0
- Treatment
- conventional tillagee0
- Outcome
- SCN virulence to Pekinge0
- Direction
- faster increasee0
- Comparator
- no tille0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no till, conventional tillage resulted in a faster increase of SCN virulence to Peking when the SCN was selected by R2 and virulence to PI 88788 by R3”
t0“Soybean”
Claim · model-written summary
Conventional tillage increased SCN virulence to PI 88788 faster than no till under R3 selection.
- Taxon
- SoybeanGlycine maxt0
- Material
- R3e0
- Treatment
- conventional tillagee0
- Outcome
- virulence to PI 88788e0
- Direction
- faster increasee0
- Comparator
- no tille0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no till, conventional tillage resulted in a faster increase of SCN virulence to Peking when the SCN was selected by R2 and virulence to PI 88788 by R3”
t0“Soybean”
Claim · model-written summary
R1 supported greatest SCN population density among the three resistant cultivars.
- Taxon
- SoybeanGlycine maxt0
- Material
- R1e0
- Outcome
- SCN population densitye0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the three SCN-resistant cultivars, R1 supported the greatest population density, R2 supported intermediate population density, and R3 supported the least SCN population density”
t0“Soybean”
Claim · model-written summary
R2 supported intermediate SCN population density among the three resistant cultivars.
- Taxon
- SoybeanGlycine maxt0
- Material
- R2e0
- Outcome
- SCN population densitye0
- Direction
- intermediatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the three SCN-resistant cultivars, R1 supported the greatest population density, R2 supported intermediate population density, and R3 supported the least SCN population density”
t0“Soybean”
Claim · model-written summary
R3 supported least SCN population density among the three resistant cultivars.
- Taxon
- SoybeanGlycine maxt0
- Material
- R3e0
- Outcome
- SCN population densitye0
- Direction
- leaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among the three SCN-resistant cultivars, R1 supported the greatest population density, R2 supported intermediate population density, and R3 supported the least SCN population density”
t0“Soybean”
Claim · model-written summary
SCN populations selected by R1 overcame PI 88788 resistance.
- Taxon
- SoybeanGlycine maxt0
- Material
- R1e0
- Outcome
- resistance in PI 88788e0
- Direction
- overcamee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SCN populations selected by R1 overcame the resistance in PI 88788 but not in Peking and PI 437654”
t0“Soybean”
Claim · model-written summary
SCN populations selected by R1 did not overcome resistance in Peking or PI 437654.
- Taxon
- SoybeanGlycine maxt0
- Material
- R1e0
- Outcome
- Peking and PI 437654e0
- Direction
- note0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The SCN populations selected by R1 overcame the resistance in PI 88788 but not in Peking and PI 437654”
t0“Soybean”
Claim · model-written summary
R2 selected SCN populations that overcame Peking resistance.
- Taxon
- SoybeanGlycine maxt0
- Material
- R2e0
- Outcome
- resistance in Pekinge0
- Direction
- overcamee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R2 selected SCN populations that overcame the resistance in Peking but not in PI 88788 and PI 437654”
t0“Soybean”
Claim · model-written summary
R2 selected populations did not overcome PI 88788 or PI 437654 resistance.
- Taxon
- SoybeanGlycine maxt0
- Material
- R2e0
- Outcome
- PI 88788 and PI 437654e0
- Direction
- note0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R2 selected SCN populations that overcame the resistance in Peking but not in PI 88788 and PI 437654”
t0“Soybean”
Claim · model-written summary
R3 selected populations overcame both PI 88788 and Peking resistance.
- Taxon
- SoybeanGlycine maxt0
- Material
- R3e0
- Outcome
- PI 88788 and Peking sources of resistancee0
- Direction
- overcamee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R3 selected SCN populations that overcame both PI 88788 and Peking sources of resistance”
t0“Soybean”
Claim · model-written summary
No cultivar sequence increased SCN virulence to PI 437654.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- virulence to PI 437654e0
- Direction
- no increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no increase of virulence to PI 437654 in any cultivar sequence”
t0“Soybean”
Claim · model-written summary
R1 rotation with R2 or R3 reduced SCN female index on Peking.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- R1 in rotation with R2 or R3e0
- Outcome
- female index on Pekinge0
- Direction
- negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R1 in rotation with R2 or R3 had a negative effect on female index on Peking”
t0“Soybean”
Claim · model-written summary
Susceptible soybean reduced SCN virulence to Peking.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- Susceptible soybeane0
- Outcome
- SCN virulence to Pekinge0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Susceptible soybean reduced SCN virulence to Peking, indicating that there was fitness cost of the Peking virulent SCN type”
t0“Soybean”
Claim · model-written summary
The authors recommend rotation of Peking with PI 88788 for SCN management.
- Taxon
- SoybeanGlycine maxt0
- Material
- Pekinge0
- Outcome
- rotation of Peking with PI 88788e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rotation of Peking with PI 88788 is a good strategy for managing the SCN, and susceptible cultivar and no till may reduce SCN virulence selection pressure in some rotations”
t0“Soybean”
Claim · model-written summary
The authors suggest susceptible cultivars and no till to reduce SCN virulence selection pressure in some rotations.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- susceptible cultivar and no tille0
- Qualifier
- some rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rotation of Peking with PI 88788 is a good strategy for managing the SCN, and susceptible cultivar and no till may reduce SCN virulence selection pressure in some rotations”
t0“Soybean”
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