Abstract
Identification of mechanisms by which plant growth-promoting rhizobacteria (PGPR) affect plants is required to obtain consistent or predictable increases in crop yields using PGPR. We conducted an outdoor lysimeter study using 12 glass-fronted rhizotrons to determine if inoculation with a strain of Pseudomonas fluorescens (G20-18) might benefit spring wheat (Triticum aestivum L.) (cv. Katepwa) yield by altering root growth. Inoculated and uninoculated treatments were either well watered or subjected to terminal drought with just one surface irrigation at anthesis. The only significant effect of G20-18 inoculation was a reduction in root growth in the well-watered rhizotrons after about 40 d. Inoculation did not significantly affect depth of rooting, soil moisture depletion, seed yield or uptake of 15 N-labelled fertilizer. Watering regime did not affect overall root growth, although there were significant differences within specific depths. Final yields in well-watered treatments were double those of the drought-stressed treatments. Variability in yields within the drought-stressed treatments occurred due to accidental flooding of several rhizotrons early in the experiment, and demonstrated the value of deeply placed available moisture under drought conditions. We conclude that inoculation with G20-18 has minor effects on root growth that are unlikely to affect wheat yield. Key words: Plant growth-promoting rhizobacteria, rhizobacteria, roots, rooting depth, rhizotrons, N use efficiency, drought
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Claims 9
Claim · model-written summary
G20-18 inoculation significantly reduced root growth in well-watered rhizotrons after about 40 days.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- G20-18 inoculatione0
- Interactor
- G20-18e0symbiont
- Outcome
- root growthe0
- Direction
- reductione0
- Qualifier
- well-watered rhizotrons after about 40 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The only significant effect of G20-18 inoculation was a reduction in root growth in the well-watered rhizotrons after about 40 d”
e1“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Inoculation did not significantly affect rooting depth or soil moisture depletion.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Inoculatione0
- Interactor
- Pseudomonas fluorescens (G20-18)
.JPG?width=60)
Pseudomonas fluorescense2symbiont - Outcome
- depth of rooting, soil moisture depletione0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“Inoculation did not significantly affect depth of rooting, soil moisture depletion, seed yield or uptake of 15 N-labelled fertilizer”
e1“spring wheat (Triticum aestivum L.)”
e2“Pseudomonas fluorescens (G20-18)”
Claim · model-written summary
Inoculation did not significantly affect seed yield.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Inoculatione0
- Interactor
- Pseudomonas fluorescens (G20-18)Pseudomonas fluorescense2symbiont
- Outcome
- seed yielde0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation did not significantly affect depth of rooting, soil moisture depletion, seed yield or uptake of 15 N-labelled fertilizer”
e1“spring wheat (Triticum aestivum L.)”
e2“Pseudomonas fluorescens (G20-18)”
Claim · model-written summary
Inoculation did not significantly affect uptake of 15 N-labelled fertilizer.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Inoculatione0
- Interactor
- Pseudomonas fluorescens (G20-18)Pseudomonas fluorescense2symbiont
- Outcome
- uptake of 15 N-labelled fertilizere0
- Direction
- did not significantly affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation did not significantly affect depth of rooting, soil moisture depletion, seed yield or uptake of 15 N-labelled fertilizer”
e1“spring wheat (Triticum aestivum L.)”
e2“Pseudomonas fluorescens (G20-18)”
Claim · model-written summary
Watering regime did not affect overall root growth.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Watering regimee0
- Outcome
- overall root growthe0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Watering regime did not affect overall root growth”
e1“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Watering regimes produced significant root growth differences at specific depths.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Watering regimee2
- Outcome
- differences within specific depthse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although there were significant differences within specific depths”
e1“spring wheat (Triticum aestivum L.)”
e2“Watering regime did not affect overall root growth”
Claim · model-written summary
Well-watered wheat had double the final yield of drought-stressed wheat.
- Taxon
- wheatTriticum aestivume1
- Treatment
- well-watered treatmentse0
- Outcome
- Final yieldse0
- Direction
- doublee0
- Value
- doublee0
- Comparator
- drought-stressed treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Final yields in well-watered treatments were double those of the drought-stressed treatments”
e1“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
Accidental early flooding caused yield variability among drought-stressed treatments.
- Taxon
- wheatTriticum aestivume1
- Treatment
- accidental floodinge0
- Outcome
- Variability in yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variability in yields within the drought-stressed treatments occurred due to accidental flooding of several rhizotrons early in the experiment”
e1“spring wheat (Triticum aestivum L.)”
Claim · model-written summary
The authors concluded that G20-18 has minor root-growth effects unlikely to affect wheat yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- inoculation with G20-18e0
- Outcome
- minor effects on root growth that are unlikely to affect wheat yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We conclude that inoculation with G20-18 has minor effects on root growth that are unlikely to affect wheat yield”
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See all 532 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.