Abstract
Increases in root and shoot fresh weight were observed when the nutrient solutions used for growth of tomato, cucumber, lettuce, and potato plants were bacterized with plant growth promoting Pseudomonas strains. It is hypothesized that plant growth promotion is due to the suppression of a deleterious rhizosphere microflora, especially deleterious endorhizosphere bacteria. The composition of the microbial community in artificial substrates, such as nutrient films and rockwool, is thought to be less complex than in soil. Therefore, development of a microflora deleterious for plant growth has to be anticipated. Microbial development in hydrocultures was simulated by preinoculating plant nutrient solutions with rhizosphere suspensions from plants that had been grown for different lengths of time in hydroponic cultures. After 16 days the plants in preinoculated nutrient solutions showed a growth reduction that correlated with the extent of root colonization by fluorescent pseudomonads in the endorhizosphere. Bacterization with plant growth promoting Pseudomonas sp. strain WCS417r counteracted this plant growth reduction. This increase in plant growth was accompanied by a dense colonization of the endorhizosphere by WCS417r and by a consequent displacement of indigenous endorhizosphere-inhabiting pseudomonads.Key words: Pseudomonas, endorhizosphere, hydroponics, plant growth, colonization.
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Claims 5
Claim · model-written summary
Plant growth promoting Pseudomonas increased root fresh weight of hydroponic crops.
- Taxon
- tomato, cucumber, lettuce, and potato plants
Cucumis sativus
Solanum lycopersicum
Solanum tuberosum
Lactuca sativae0 - Treatment
- bacterized with plant growth promoting Pseudomonas strainse0
- Interactor
- Pseudomonas strainse0symbiont
- Outcome
- root and shoot fresh weighte0
- Direction
- Increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in root and shoot fresh weight were observed when the nutrient solutions used for growth of tomato, cucumber, lettuce, and potato plants were bacterized with plant growth promoting Pseudomonas strains”
Claim · model-written summary
Preinoculated nutrient solutions reduced plant growth after 16 days.
- Taxon
- plantsViridiplantaee0
- Treatment
- preinoculated nutrient solutionse0
- Outcome
- growthe0
- Direction
- reductione0
- Value
- 16 dayse0
Not reportedComparator
Verbatim
e0“After 16 days the plants in preinoculated nutrient solutions showed a growth reduction”
Claim · model-written summary
The growth reduction correlated with fluorescent pseudomonad colonization of the endorhizosphere.
- Taxon
- plantsViridiplantaee0e1
- Interactor
- fluorescent pseudomonadsPseudomonas fluorescens groupe0e1other
Not reportedDirection
Verbatim
e0“growth reduction that correlated with the extent of root colonization by fluorescent pseudomonads in the endorhizosphere”
e1“After 16 days the plants”
Claim · model-written summary
WCS417r bacterization counteracted growth reduction.
- Taxon
- plantsViridiplantaee0e1
- Interactor
- Pseudomonas sp. strain WCS417r
Pseudomonas sp.e0e1symbiont
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacterization with plant growth promoting Pseudomonas sp. strain WCS417r counteracted this plant growth reduction”
e1“After 16 days the plants”
Claim · model-written summary
Growth promotion coincided with dense WCS417r endorhizosphere colonization and displacement of indigenous pseudomonads.
- Taxon
- plantsViridiplantaee0e1
Verbatim
e0“This increase in plant growth was accompanied by a dense colonization of the endorhizosphere by WCS417r and by a consequent displacement of indigenous endorhizosphere-inhabiting pseudomonads”
e1“After 16 days the plants”
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