Abstract
Abstract Plant‐growth‐promoting rhizobacteria ( PGPR ) utilise amino acids exuded from plant root systems, but hitherto there have been no direct measurements of rhizosphere concentrations of the amino acid 1‐amino‐cyclopropane‐1‐carboxylic acid ( ACC ) following inoculation with PGPR containing the enzyme ACC deaminase. When introduced to the rhizosphere of two potato ( Solanum tuberosum ) cultivars (cv. Swift and cv. Nevsky), various ACC deaminase containing rhizobacteria ( Achromobacter xylosoxidans Cm4, Pseudomonas oryzihabitans Ep4 and Variovorax paradoxus 5C ‐2) not only decreased rhizosphere ACC concentrations but also decreased concentrations of several proteinogenic amino acids (glutamic acid, histidine, isoleucine, leucine, phenylalanine, serine, threonine, tryptophan, tyrosine, valine). These effects were not always correlated with the ability of the bacteria to metabolise these compounds in vitro , suggesting bacterial mediation of root amino acid exudation. All rhizobacteria showed similar root colonisation following inoculation of sand cultures, thus species differences in amino acid utilisation profiles apparently did not confer any selective advantage in the potato rhizosphere. Rhizobacterial inoculation increased root biomass (by up to 50%) and tuber yield (by up to 40%) in pot trials, and tuber yield (by up to 27%) in field experiments, especially when plants were grown under water‐limited conditions. Nevertheless, inoculated and control plants showed similar leaf water relations, indicating that alternative mechanisms (regulation of phytohormone balance) were responsible for growth promotion. Rhizobacteria generally increased tuber number more than individual tuber weight, suggesting that accelerated vegetative development was responsible for increased yield.
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Claims 9
Claim · model-written summary
ACC-deaminase rhizobacteria lowered potato rhizosphere ACC concentration.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- various ACC deaminase containing rhizobacteriae0
- Outcome
- rhizosphere ACC concentrationse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“various ACC deaminase containing rhizobacteria ( Achromobacter xylosoxidans Cm4, Pseudomonas oryzihabitans Ep4 and Variovorax paradoxus 5C ‐2) not only decreased rhizosphere ACC concentrations”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
The rhizobacteria lowered several proteinogenic amino acids in the potato rhizosphere.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- concentrations of several proteinogenic amino acidse0
- Direction
- decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased concentrations of several proteinogenic amino acids (glutamic acid, histidine, isoleucine, leucine, phenylalanine, serine, threonine, tryptophan, tyrosine, valine)”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Amino acid concentration effects were not always correlated with bacterial metabolism of those compounds in vitro.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- These effectse0
- Qualifier
- in vitroe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects were not always correlated with the ability of the bacteria to metabolise these compounds in vitro”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
All tested rhizobacteria showed similar potato root colonisation after sand-culture inoculation.
- Taxon
- potatoSolanum tuberosumt0
- Interactor
- rhizobacteriaHyphomicrobialese0symbiont
- Outcome
- root colonisatione0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All rhizobacteria showed similar root colonisation following inoculation of sand cultures”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Rhizobacterial inoculation increased potato root biomass by up to 50% in pots.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Rhizobacterial inoculatione0
- Outcome
- root biomasse0
- Direction
- increasede0
- Value
- up to 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobacterial inoculation increased root biomass (by up to 50%) and tuber yield (by up to 40%) in pot trials”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Rhizobacterial inoculation increased potato tuber yield by up to 40% in pots.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Rhizobacterial inoculatione0
- Outcome
- tuber yielde0
- Direction
- increasede0
- Value
- up to 40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobacterial inoculation increased root biomass (by up to 50%) and tuber yield (by up to 40%) in pot trials”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Rhizobacterial inoculation increased potato tuber yield by up to 27% in field experiments.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- tuber yielde0
- Value
- up to 27%e0
- Qualifier
- water‐limited conditionse0
- Setting
- field experimentse0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tuber yield (by up to 27%) in field experiments, especially when plants were grown under water‐limited conditions”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Inoculated and control potato plants had similar leaf water relations.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- inoculatede0
- Outcome
- leaf water relationse0
- Direction
- similare0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculated and control plants showed similar leaf water relations”
t0“potato (Solanum tuberosum)”
Claim · model-written summary
Rhizobacteria generally increased potato tuber number more than individual tuber weight.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Rhizobacteriae0
- Outcome
- tuber numbere0
- Direction
- increasede0
- Comparator
- individual tuber weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rhizobacteria generally increased tuber number more than individual tuber weight”
t0“potato (Solanum tuberosum)”
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