Can ACC-deaminase bacteria rescue beans from salt stress?
Two garlic-rhizosphere isolates (A. aneurinilyticus ACC02 and Paenibacillus ACC06) cut stress ethylene ~60% and boosted French bean growth traits under salinity when applied as a consortium.
Source
ACC Deaminase Producing Bacteria With Multifarious Plant Growth Promoting Traits Alleviates Salinity Stress in French Bean (<i>Phaseolus vulgaris</i>) Plants
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Can ACC-deaminase bacteria rescue beans from salt stress?
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Consortium cut stress ethylene ~60%.
The seed bacterization by ACC02 and ACC06 revealed that treatment of plants with bacterial isolates in the form of consortia significantly declined (∼60%) stress stimulated ethylene levels and its associated growth inhibition by virtue of their ACC deaminase activity.
Under salinity, shoot biomass rose 425% with consortia.
The consortia treatment alleviated the negative effects of salinity stress and increased root length (110%), root fresh weight (∼45%), shoot length (60%), shoot fresh weight (255%), root biomass (220%), shoot biomass (425%), and total chlorophyll content (∼57%) of French bean seedlings subjected to salinity stress.
What they did
Screened garlic rhizosphere isolates for ACC deaminase and other PGP traits, identified ACC02/ACC06 by 16S, then tested seed bacterization consortia on French bean under non-saline and saline pot conditions.
What they found
Two of six isolates made >~1500 nmol α-ketobutyrate mg protein⁻¹ h⁻¹ and other PGP activities; tolerated 6% NaCl and −0.73 MPa drought in vitro. Consortium lowered stress ethylene ~60% and increased root length 110%, shoot fresh weight 255%, shoot biomass 425%, chlorophyll ~57%, among other gains under salinity.
The limits
What it doesn't show
Pot-trial gains may not translate to field agronomy or other crops; isolate performance can depend on soil microbiome and salt regime.
Key terms
- ACC deaminase
- Enzyme cleaving ACC, lowering stress ethylene in plants.
- PGPR
- Plant growth-promoting rhizobacteria.
- Siderophore
- Iron-chelating compound aiding nutrient acquisition.
- IAA
- Indole acetic acid auxin produced by isolates.
- Salinity stress
- High salt conditions that elevate ethylene and stunt growth.
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ACC-deaminase positives among six isolates:
Common questions
Where isolated?
Garlic (Allium sativum) rhizosphere.
Lead strains?
ACC02 A. aneurinilyticus; ACC06 Paenibacillus sp.
Ethylene effect?
~60% decline in stress-stimulated ethylene with consortia.
Example growth gain?
Shoot biomass +425% under salinity.
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