Abstract
Endophytic rhizobia have been shown to improve the nutrition of nonlegume crops. The objective of this work was to investigate the effects of field pea (Pisum sativum)-based crop rotations on endophytic rhizobia in roots of cereal and oilseed crops. Barley (Hordeum vulgare), wheat (Triticum aestivum) and canola (Brassica rapa) were each grown (a) following inoculated peas, (b) following uninoculated peas or (c) in monoculture. At flag-leaf or flowering growth stage, populations of endophytic rhizobia were usually in the order: crop following uninoculated peas (up to 7244 cells g -1 root DM) > crop following inoculated peas (up to 1660 cells g -1 root DM) > crop grown in monoculture (< 10 cells g -1 root DM). At one of three sites, there were significant positive correlations between endophytic rhizobia and crop N and yield. Populations of rhizobia in bulk soil, rhizosphere, or rhizoplane of nonlegume roots were greater where nonlegume crops were preceded by peas (inoculated or uninoculated) than where they were grown in monoculture. Significant positive correlations between populations of these rhizobia outside roots and crop N or yields were observed at each site. Key words: Crop rotation, inoculation, nitrogen fixation, plant growth-promoting rhizobacteria (PGPR), 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 8
Claim · model-written summary
Endophytic rhizobia were most abundant after uninoculated peas, then inoculated peas, and least in monoculture.
- Taxon
- Barley, wheat and canola
.jpg?width=60)
Hordeum vulgare
Triticum aestivum.jpg?width=60)
Brassica napus var. napust0 - Treatment
- crop following uninoculated pease0
- Interactor
- rhizobiae0symbiont
- Outcome
- populations of endophytic rhizobiae0
- Direction
- >e0
- Value
- up to 7244 cells g -1 root DMe0
- Comparator
- crop grown in monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
.jpg?width=500)
Verbatim
e0“populations of endophytic rhizobia were usually in the order: crop following uninoculated peas (up to 7244 cells g -1 root DM) > crop following inoculated peas (up to 1660 cells g -1 root DM) > crop grown in monoculture (< 10 cells g -1 root DM).”
t0“barley, wheat and canola”
Claim · model-written summary
Endophytic rhizobia after inoculated peas reached 1660 cells per root dry mass.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiat0symbiont
- Outcome
- crop following inoculated pease0
- Value
- up to 1660 cells g -1 root DMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crop following inoculated peas (up to 1660 cells g -1 root DM)”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Endophytic rhizobia in monoculture were below 10 cells per root dry mass.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiat0symbiont
- Outcome
- crop grown in monoculturee0
- Value
- < 10 cells g -1 root DMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crop grown in monoculture (< 10 cells g -1 root DM)”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Endophytic rhizobia correlated positively with crop nitrogen at one of three sites.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiae0symbiont
- Outcome
- crop Ne0
- Direction
- positivee0
- Qualifier
- one of three sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At one of three sites, there were significant positive correlations between endophytic rhizobia and crop N and yield.”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Endophytic rhizobia correlated positively with crop yield at one of three sites.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiae0symbiont
- Outcome
- yielde0
- Direction
- positivee0
- Qualifier
- one of three sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At one of three sites, there were significant positive correlations between endophytic rhizobia and crop N and yield.”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Preceding peas increased rhizobia in bulk soil, rhizosphere and rhizoplane compared with monoculture.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Treatment
- preceded by peas (inoculated or uninoculated)e0
- Interactor
- rhizobiae0symbiont
- Outcome
- Populations of rhizobia in bulk soil, rhizosphere, or rhizoplane of nonlegume rootse0
- Direction
- greatere0
- Comparator
- monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Populations of rhizobia in bulk soil, rhizosphere, or rhizoplane of nonlegume roots were greater where nonlegume crops were preceded by peas (inoculated or uninoculated) than where they were grown in monoculture.”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Rhizobia outside roots correlated positively with crop nitrogen at every site.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiae0symbiont
- Outcome
- crop Ne0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant positive correlations between populations of these rhizobia outside roots and crop N or yields were observed at each site.”
t0“Endophytic rhizobia in barley, wheat and canola roots”
Claim · model-written summary
Rhizobia outside roots correlated positively with crop yield at every site.
- Taxon
- barley, wheat and canolaHordeum vulgareTriticum aestivumBrassica napus var. napust0
- Interactor
- rhizobiae0symbiont
- Outcome
- yieldse0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant positive correlations between populations of these rhizobia outside roots and crop N or yields were observed at each site.”
t0“Endophytic rhizobia in barley, wheat and canola roots”
The same questions in other papers
inoculation · pest · Brassica napus (oilseed rape)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 papers →inoculation · pest · Hordeum vulgare (barley)Positive and negative results
7 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 papers →inoculation · pest · Triticum aestivum (wheat)Positive and negative results
21 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
20 papers more in this group
See all 24 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.