Abstract
Pageni, B. B., Lupwayi, N. Z., Akter, Z., Larney, F. J., Kawchuk, L. M. and Gan, Y. 2014. Plant growth-promoting and phytopathogen-antagonistic properties of bacterial endophytes from potato (Solanum tuberosum L.) cropping systems. Can. J. Plant Sci. 94: 835–844. Endophytes are microorganisms that live within a plant without harming it. Bacterial endophytes were isolated from roots of potatoes (Solanum tuberosum L.) grown under different rotations (3 to 6 yr in length) and soil management (CONV, conventional; CONS, conservation) in irrigated cropping systems with dry bean (Phaseolus vulgaris L.), sugar beet (Beta vulgaris L.) spring wheat (Triticum aestivum L.) and timothy (Phleum pratense L.). The endophytes were characterized for nitrogen fixation potential, phytohormone production and phytopathogen-antagonistic properties. The nitrogen-fixing nitrogenase (nifH) gene was detected in potato grown in all rotations, presumably partly because the soil in all rotations contained Rhizobium leguminosarum bv. phaseoli from the dry bean phase. Sequence analysis revealed that it was homologous to the genes found in Burkholderia, Azospirillum, Ideonella, Pseudacidovorax and Bradyrhizobium species. Indole acetic acid (IAA) hormone production by endophytes isolated from potato grown under CONS management was 66% greater than that those isolated from potato grown under CONV management, and tended to be greater in longer than shorter rotations. When 12 endophytes were inoculated to dry bean, four increased shoot biomass by 27–34%, and six increased total (shoot+root) biomass by 25% on average. Endophytes from the longer CONS rotations (4–6 yr) resulted in significantly higher (by 9%) shoot biomass than the shortest CONS (3 yr) rotation. Six of 108 endophyte isolates exhibited antagonistic properties (reduced pathogen biomass by 12 to 58% in dual culture assays in liquid media) against potato pathogens Pectobacterium atrosepticum, Fusarium sambucinum and Clavibacter michiganensis subsp. epedonicus. All the six isolates were from CONS soil management. Therefore, the benefits of long rotations, with their associated CONS soil management, to crop productivity in these irrigated cropping systems probably include nutritional (biological nitrogen fixation and IAA hormone production) and disease-control benefits imparted by endophytic bacteria.
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Claims 9
Claim · model-written summary
The nifH gene was detected in potato from all rotations.
- Taxon
- potato
Solanum tuberosume0 - Gene
- nifHe0
- Outcome
- detected in potato grown in all rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato (Solanum tuberosum L.) cropping systems”
e0“The nitrogen-fixing nitrogenase (nifH) gene was detected in potato grown in all rotations”
Claim · model-written summary
The detected nifH sequences were homologous to genes in six named bacterial genera.
- Taxon
- potato (Solanum tuberosum L.)Solanum tuberosumt0
- Outcome
- homologous to the genes found in Burkholderia, Azospirillum, Ideonella, Pseudacidovorax and Bradyrhizobium speciese0
Not reportedGene
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato (Solanum tuberosum L.) cropping systems”
e0“Sequence analysis revealed that it was homologous to the genes found in Burkholderia, Azospirillum, Ideonella, Pseudacidovorax and Bradyrhizobium species”
Claim · model-written summary
Endophytes from conservation-managed potato produced 66% more IAA than those from conventional management.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- Indole acetic acid (IAA) hormone production by endophytese0
- Direction
- greatere0
- Value
- 66%e0
- Comparator
- CONV managemente0
- Setting
- CONS managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Indole acetic acid (IAA) hormone production by endophytes isolated from potato grown under CONS management was 66% greater than that those isolated from potato grown under CONV management”
Claim · model-written summary
Endophyte IAA production tended to be greater in longer than shorter rotations.
- Taxon
- potato (Solanum tuberosum L.)Solanum tuberosumt0
- Outcome
- greater in longer than shorter rotationse0
- Direction
- greatere0
- Comparator
- shorter rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tended to be greater in longer than shorter rotations”
t0“potato (Solanum tuberosum L.) cropping systems”
Claim · model-written summary
Four inoculated endophytes increased dry bean shoot biomass by 27–34%.
- Taxon
- dry beane0
- Treatment
- endophytes were inoculatede0
- Interactor
- endophytese0symbiont
- Outcome
- shoot biomasse0
- Direction
- increasede0
- Value
- 27–34%e0
Not reportedComparator
Verbatim
e0“When 12 endophytes were inoculated to dry bean, four increased shoot biomass by 27–34%”
Claim · model-written summary
Six inoculated endophytes increased dry bean total biomass by 25% on average.
- Taxon
- dry beane0
- Treatment
- endophytes were inoculatede0
- Interactor
- endophytese0symbiont
- Outcome
- total (shoot+root) biomasse0
- Direction
- increasede0
- Value
- 25%e0
Not reportedComparator
Verbatim
e0“When 12 endophytes were inoculated to dry bean, four increased shoot biomass by 27–34%, and six increased total (shoot+root) biomass by 25% on average”
Claim · model-written summary
Endophytes from longer conservation rotations produced 9% more dry bean shoot biomass than those from the shortest conservation rotation.
Verbatim
e0“Endophytes from the longer CONS rotations (4–6 yr) resulted in significantly higher (by 9%) shoot biomass than the shortest CONS (3 yr) rotation”
e1“When 12 endophytes were inoculated to dry bean”
Claim · model-written summary
Six endophyte isolates reduced biomass of potato pathogens by 12 to 58% in dual culture.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- Pectobacterium atrosepticum
Pectobacterium atrosepticume0pathogen - Second interactor
- endophyte isolatese0biocontrol_agent
- Outcome
- pathogen biomasse0
- Direction
- reducede0
- Value
- 12 to 58%e0
- Qualifier
- Fusarium sambucinum and Clavibacter michiganensis subsp. epedonicuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six of 108 endophyte isolates exhibited antagonistic properties (reduced pathogen biomass by 12 to 58% in dual culture assays in liquid media) against potato pathogens Pectobacterium atrosepticum, Fusarium sambucinum and Clavibacter michiganensis subsp. epedonicus”
Claim · model-written summary
All six antagonistic endophyte isolates came from conservation management.
- Taxon
- potato (Solanum tuberosum L.)Solanum tuberosumt0
- Outcome
- All the six isolates were from CONS soil managemente0
- Setting
- CONS soil managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the six isolates were from CONS soil management”
t0“potato (Solanum tuberosum L.) cropping systems”
The same questions in other papers
inoculation · growth · Phaseolus vulgaris (common bean)Results differ
105 papers in the same direction as this paper · 20 in the opposite direction
- negative
- negative
- negative
122 papers more in this group
See all 126 papers →rotation · growth · Phaseolus vulgaris (common bean)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.