Abstract
Soil-borne oomycetes include devastating plant pathogens that cause substantial losses in the agricultural sector. To better manage this important group of pathogens, it is critical to understand how they respond to common agricultural practices, such as tillage and crop rotation. Here, a long-term field experiment was established using a split-plot design with tillage as the main plot factor (conventional tillage (CT) vs. no till (NT), two levels) and rotation as the subplot factor (monocultures of soybean, corn, or wheat, and corn–soybean–wheat rotation, four levels). Post-harvest soil oomycete communities were characterized over three consecutive years (2016–2018) by metabarcoding the Internal Transcribed Spacer 1 (ITS1) region. The community contained 292 amplicon sequence variants (ASVs) and was dominated by Globisporangium spp. (85.1% in abundance, 203 ASV) and Pythium spp. (10.4%, 51 ASV). NT decreased diversity and community compositional structure heterogeneity, while crop rotation only affected the community structure under CT. The interaction effects of tillage and rotation on most oomycetes species accentuated the complexity of managing these pathogens. Soil and crop health represented by soybean seedling vitality was lowest in soils under CT cultivating soybean or corn, while the grain yield of the three crops responded differently to tillage and crop rotation regimes.
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Claims 8
Claim · model-written summary
Metabarcoding of post-harvest soil oomycete communities over 2016-2018 found 292 amplicon sequence variants.
Verbatim
e0“Post-harvest soil oomycete communities were characterized over three consecutive years (2016–2018) by metabarcoding the Internal Transcribed Spacer 1 (ITS1) region. The community contained 292 amplicon sequence variants (ASVs)”
Claim · model-written summary
The oomycete community was dominated by Globisporangium spp. at 85.1% in abundance (203 ASVs).
- Taxon
- Globisporangium spp.Globisporangiume0
- Outcome
- abundancee0
- Value
- 85.1%e0
- Qualifier
- 203 ASVe0
Verbatim
e0“dominated by Globisporangium spp. (85.1% in abundance, 203 ASV)”
Claim · model-written summary
Pythium spp. made up 10.4% of the oomycete community abundance (51 ASVs).
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PythiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“abundance, 203 ASV) and Pythium spp. (10.4%, 51 ASV)”
Claim · model-written summary
No till decreased oomycete diversity and community compositional structure heterogeneity compared with conventional tillage.
Verbatim
e0“Soil-borne oomycetes”
e1“NT decreased diversity and community compositional structure heterogeneity”
e2“conventional tillage (CT) vs. no till (NT)”
Claim · model-written summary
Crop rotation affected the oomycete community structure only under conventional tillage.
Not reportedComparatorDirection
Verbatim
e0“Soil-borne oomycetes”
e1“crop rotation only affected the community structure under CT”
Claim · model-written summary
Tillage and rotation had interaction effects on most oomycete species.
Not reportedComparatorDirection
Verbatim
e0“The interaction effects of tillage and rotation on most oomycetes species”
Claim · model-written summary
Soybean seedling vitality, representing soil and crop health, was lowest in soils under conventional tillage cultivating soybean or corn.
- Taxon
- soybean
Glycine maxe0 - Treatment
- CTe0
- Outcome
- soybean seedling vitalitye0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil and crop health represented by soybean seedling vitality was lowest in soils under CT cultivating soybean or corn”
Claim · model-written summary
The grain yield of the three crops responded differently to tillage and crop rotation regimes.
Not reportedComparatorDirection
Verbatim
e0“the grain yield of the three crops responded differently to tillage and crop rotation regimes”
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tillage · organism · Glycine max (soybean)Positive and negative results
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