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Abscisic acid metabolizing rhizobacteria decrease ABA concentrations in planta and alter plant growth.

Andrey A Belimov¹, Ian C Dodd², Vera I Safronova¹

¹All-Russia Research Institute for Agricultural Microbiology (ARRIAM), Podbelskogo sh. 3, Pushkin 196608, St. Petersburg, Russian Federation.

Plant Physiology and Biochemistry : PPB

|November 26, 2013

Summary

This summary is machine-generated.

Rhizobacteria that metabolize abscisic acid (ABA) can influence plant growth. These ABA-metabolizing microbes may stimulate plant growth by altering ABA concentrations within the plant, suggesting an ABA-dependent mechanism for enhanced growth.

Keywords:

1-aminocyclopropane-1-carboxylate ABA ACC Abscisic acid BPF Bacto-Pseudomonas F medium CFU IAA ICA ILA MSMN Novosphingobium PGPR Phytohormones Plant–microbe interactions Rhizosphere Rhodococcus abscisic acid colony forming units indole-3-acetic acid indole-3-carboxylic acid indole-3-lactic acid mineral salts minimal with nitrogen medium plant growth-promoting rhizobacteria

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Monitoring Bacterial Colonization and Maintenance on Arabidopsis thaliana Roots in a Floating Hydroponic System

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Area of Science:

Microbiology
Plant Physiology
Biochemistry

Background:

Endogenous phytohormones like abscisic acid (ABA) are crucial for regulating root development.
Rhizobacteria are known to influence plant hormone levels, but their role in metabolizing ABA to affect plant growth was previously uninvestigated.

Purpose of the Study:

To isolate and identify rhizobacteria capable of metabolizing ABA.
To investigate the impact of ABA-metabolizing rhizobacteria on plant ABA concentrations and growth.
To elucidate the mechanism by which rhizobacteria influence plant growth via ABA.

Main Methods:

Isolation of ABA-utilizing bacterial strains (Rhodococcus sp. P1Y, Novosphingobium sp. P6W) from rice rhizosphere.
Culturing bacteria on ABA-supplemented media and assessing ABA utilization.
Inoculating rice and tomato (including ABA-deficient mutants) with bacterial strains and measuring plant ABA levels and growth parameters.
Investigating the role of ethylene signaling by using silver ion treatment.

Main Results:

Two bacterial strains, Rhodococcus sp. P1Y and Novosphingobium sp. P6W, were identified as capable of utilizing ABA as a sole carbon source.
Inoculation with these strains altered ABA concentrations in rice shoots and tomato leaves/roots, with effects varying by plant and bacterial genotype.
Strain P6W inhibited primary root elongation in tomato but increased leaf biomass in wild-type plants.
Changes in ABA levels were observed independently of ethylene signaling, suggesting a direct ABA-mediated effect.

Conclusions:

ABA-metabolizing rhizobacteria can modulate plant ABA concentrations.
These bacteria may stimulate plant growth through an ABA-dependent mechanism.
The findings open new avenues for understanding plant-microbe interactions and developing bio-stimulants.