Colonization and Competition Dynamics of Plant Growth-Promoting/Inhibiting Bacteria in the Phytosphere of the Duckweed Lemna minor

Despite the considerable role of aquatic plant-associated bacteria in host plant growth and nutrient cycling in aquatic environments, the mode of their plant colonization has hardly been understood. This study examined the colonization and competition dynamics of a plant growth-promoting bacterium (...

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Bibliographic Details
Published in:Microbial ecology 2019-02, Vol.77 (2), p.440-450
Main Authors: Ishizawa, Hidehiro, Kuroda, Masashi, Inoue, Kanako, Inoue, Daisuke, Morikawa, Masaaki, Ike, Michihiko
Format: Article
Language:English
Subjects:
Agricultural Inoculants - classification
Agricultural Inoculants - genetics
Agricultural Inoculants - growth & development
Agricultural Inoculants - isolation & purification
Aquatic environment
Aquatic plants
Araceae - growth & development
Araceae - microbiology
Bacteria
Bacteria - classification
Bacteria - genetics
Bacteria - growth & development
Bacteria - isolation & purification
Biodiversity
Biological competition
Biomedical and Life Sciences
Colonization
Competition
Cultivation
Duckweed
Dynamics
Ecological effects
Ecology
Floating plants
Freshwater plants
Geoecology/Natural Processes
Host plants
Inoculation
Lemna minor
Life Sciences
Microbial Ecology
Microbiological strains
Microbiology
Mineral nutrients
Nature Conservation
Nutrient cycles
Plant cells
Plant growth
PLANT MICROBE INTERACTIONS
Plant Roots - growth & development
Plant Roots - microbiology
Ratios
Water Quality/Water Pollution
Weight
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Summary:Despite the considerable role of aquatic plant-associated bacteria in host plant growth and nutrient cycling in aquatic environments, the mode of their plant colonization has hardly been understood. This study examined the colonization and competition dynamics of a plant growth-promoting bacterium (PGPB) and two plant growth-inhibiting bacteria (PGIB) in the aquatic plant Lemna minor (common duckweed). When inoculated separately to L. minor, each bacterial strain quickly colonized at approximately 10⁶ cells per milligram (plant fresh weight) and kept similar populations throughout the 7-day cultivation time. The results of two-membered co-inoculation assays revealed that the PGPB strain Aquitalea magnusonii H3 consistently competitively excluded the PGIB strain Acinetobacter ursingii M3, and strain H3 co-existed at almost 1:1 proportion with another PGIB strain, Asticcacaulis excentricus M6, regardless of the inoculation ratios (99:1–1:99) and inoculation order. We also found that A. magnusonii H3 exerted its growth-promoting effect over the negative effects of the two PGIB strains even when only a small amount was inoculated, probably due to its excellent competitive colonization ability. These experimental results demonstrate that there is a constant ecological equilibrium state involved in the bacterial colonization of aquatic plants.
ISSN:0095-3628
1432-184X
DOI:10.1007/s00248-018-1306-x