Abstract
The microbial composition of the rhizosphere soil could be an important determinant of crop yield, pathogen resistance, and other beneficial attributes in plants. However, little is known about the impact of cropping sequences on microbial community dynamics, especially in economically important species like soybean. Using 2-year crop sequences of corn-soybean, canola-soybean, and soybean-soybean, we investigated how crops from the previous growing season influenced the structure of the microbiome in both the bulk soil and soybean rhizosphere. A combination of marker-based Illumina sequencing and bioinformatics analyses was used to show that bacterial species richness and evenness in the soybean rhizosphere soil were similar following canola and soybean compared to a previous corn sequence. However, fungal species richness and evenness remained unaffected by crop sequence. In addition, bacterial and fungal species diversity in both the bulk and soybean rhizosphere soil were not influenced by crop sequence. Lastly, the corn-soybean sequence significantly differed in the relative abundance of certain bacterial and fungal classes in both the soybean rhizosphere and bulk soil. While canola-soybean and a continuous soybean sequence did not, suggesting that a preceding corn sequence may reduce the occurrence of overall bacterial and fungal community members. For the present study, crop sequence impacts bacterial diversity and richness in both the bulk soil and soybean rhizosphere soil whereas fungal diversity and richness are resilient to crop sequence practices. Together, these findings could help drive decision making for annual crop and soil management practices.
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Claims 6
Claim · model-written summary
Rhizosphere bacterial richness and evenness were similar after canola and soybean relative to corn.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- canola and soybeane0
- Outcome
- bacterial species richness and evenness in the soybean rhizosphere soile0
- Direction
- similare0
- Comparator
- a previous corn sequencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bacterial species richness and evenness in the soybean rhizosphere soil were similar following canola and soybean compared to a previous corn sequence”
t0“Soybean”
Claim · model-written summary
Fungal richness and evenness were unaffected by crop sequence.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- crop sequencee0
- Outcome
- fungal species richness and evennesse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fungal species richness and evenness remained unaffected by crop sequence”
t0“Soybean”
Claim · model-written summary
Bacterial and fungal diversity in bulk and rhizosphere soil was not influenced by crop sequence.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- crop sequencee0
- Outcome
- bacterial and fungal species diversity in both the bulk and soybean rhizosphere soile0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bacterial and fungal species diversity in both the bulk and soybean rhizosphere soil were not influenced by crop sequence”
t0“Soybean”
Claim · model-written summary
The corn-soybean sequence changed relative abundance of certain bacterial classes in rhizosphere and bulk soil.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- corn-soybean sequencee0
- Outcome
- relative abundance of certain bacteriale0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn-soybean sequence significantly differed in the relative abundance of certain bacterial and fungal classes in both the soybean rhizosphere and bulk soil”
t0“Soybean”
Claim · model-written summary
The corn-soybean sequence changed relative abundance of certain fungal classes in rhizosphere and bulk soil.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- corn-soybean sequencee0
- Outcome
- relative abundance of certain bacterial and fungal classese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn-soybean sequence significantly differed in the relative abundance of certain bacterial and fungal classes in both the soybean rhizosphere and bulk soil”
t0“Soybean”
Claim · model-written summary
The authors suggest that preceding corn may reduce overall bacterial and fungal community members.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- a preceding corn sequencee0
- Outcome
- occurrence of overall bacterial and fungal community memberse0
- Direction
- reducee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a preceding corn sequence may reduce the occurrence of overall bacterial and fungal community members”
t0“Soybean”
The same questions in other papers
rotation · ecology: diversity · Glycine max (soybean)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- no effect
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.