Abstract
We investigated the effects of field pea (Pisum sativum)-based crop rotations on endophytic bacteria in roots and surrounding soil of cereal and oilseed crops. Barley (Hordeum vulgare), wheat (Triticum aestivum) and canola (Brassica rapa) were each grown (a) following peas inoculated with Rhizobium leguminosarum bv. viceae, (b) following uninoculated peas or (c) in monoculture. At flagleaf (cereal) or flowering (canola) growth stage, populations of soil-extract agar (SEA)-culturable bacteria ranged from log 10 7.12 to log 10 7.82 cells g -1 soil dry weight in the bulk soil, log 10 7.15 to log 10 8.12 cells g -1 soil in the rhizosphere, log 10 7.77 to log 10 10.39 cells g -1 root dry matter (DM) on the rhizoplane, and log 10 5.56 to log 10 7.63 cells g -1 root DM in root interiors (endophytic bacteria). Differences between treatments in populations and functional diversity of bacteria depended on where the bacteria were sampled in the continuum from bulk soil to root interiors. This affected correlations with crop N and yield because these crop parameters were lowest in monoculture. Thus, populations of endophytic bacteria and functional diversity of rhizospheric bacteria were negatively correlated with crop N accumulation and yields. However, the diversities of endophytic and bulk soil bacteria were positively correlated with crop N and yields. Key words: Community-level physiological profile, crop rotation, substrates, endophytic bacteria, microbial functional diversity, rhizosphere
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Culturable bacterial populations spanned the reported ranges across bulk soil, rhizosphere, rhizoplane and root interiors.
- Taxon
- barley, wheat and canola
.jpg?width=60)
Hordeum vulgare
Triticum aestivum.jpg?width=60)
Brassica napus var. napust0 - Organ / stage
- root interiorse0
- Outcome
- populations of soil-extract agar (SEA)-culturable bacteriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
.jpg?width=500)
Verbatim
e0“populations of soil-extract agar (SEA)-culturable bacteria ranged from log 10 7.12 to log 10 7.82 cells g -1 soil dry weight in the bulk soil, log 10 7.15 to log 10 8.12 cells g -1 soil in the rhizosphere, log 10 7.77 to log 10 10.39 cells g -1 root dry matter (DM) on the rhizoplane, and log 10 5.56 to log 10 7.63 cells g -1 root DM in root interiors (endophytic bacteria)”
t0“barley, wheat and canola roots”
Claim · model-written summary
Treatment differences in bacterial populations and functional diversity depended on sampling position.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Outcome
- populations and functional diversity of bacteriae0
- Setting
- bulk soil to root interiorse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between treatments in populations and functional diversity of bacteria depended on where the bacteria were sampled in the continuum from bulk soil to root interiors”
t0“barley, wheat and canola roots”
Claim · model-written summary
Crop nitrogen and yield were lowest under monoculture.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Treatment
- monoculturee0
- Outcome
- crop N and yielde0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crop N and yield because these crop parameters were lowest in monoculture”
t0“barley, wheat and canola roots”
Claim · model-written summary
Endophytic bacterial populations correlated negatively with crop nitrogen accumulation and yields.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- endophytic bacteriae0other
- Outcome
- crop N accumulation and yieldse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“populations of endophytic bacteria and functional diversity of rhizospheric bacteria were negatively correlated with crop N accumulation and yields”
t0“barley, wheat and canola roots”
Claim · model-written summary
Rhizospheric bacterial functional diversity correlated negatively with crop nitrogen accumulation and yields.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizospheric bacteriae0other
- Outcome
- crop N accumulation and yieldse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“functional diversity of rhizospheric bacteria were negatively correlated with crop N accumulation and yields”
t0“barley, wheat and canola roots”
Claim · model-written summary
Endophytic bacterial diversity correlated positively with crop nitrogen and yields.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- endophytice0other
- Outcome
- crop N and yieldse0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diversities of endophytic and bulk soil bacteria were positively correlated with crop N and yields”
t0“barley, wheat and canola roots”
Claim · model-written summary
Bulk soil bacterial diversity correlated positively with crop nitrogen and yields.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- bulk soil bacteriae0other
- Outcome
- crop N and yieldse0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diversities of endophytic and bulk soil bacteria were positively correlated with crop N and yields”
t0“barley, wheat and canola roots”
The same questions in other papers
rotation · yield · Brassica napus (oilseed rape)Positive and negative results
7 papers in the same direction as this paper · 19 in the opposite direction
- positive
- positive
- positive
23 papers more in this group
See all 27 papers →rotation · yield · Hordeum vulgare (barley)Positive and negative results
16 papers in the same direction as this paper · 24 in the opposite direction
- positive
- positive
- positive
37 papers more in this group
See all 41 papers →rotation · yield · Triticum aestivum (wheat)Positive and negative results
91 papers in the same direction as this paper · 253 in the opposite direction
- positive
- positive
- positive
341 papers more in this group
See all 345 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.