Abstract
Owing to inconsistent results of a single bacterial strain, co-inoculation of more than one strain under salinity stress could be a more effective strategy to induce salt tolerance. Co-inoculation of more than one bacterial strain could be more effective due to the presence of several growths promoting traits. This study was conducted to evaluate the effectiveness of multi-strains bacterial consortium to promote wheat growth under salinity stress. Several plant growth promoting rhizobacteria (PGPR) had been isolated and tested for their ability to grow in increasing concentrations of sodium chloride (NaCl). Those rhizobacterial strains having tolerance against salinity were screened to evaluate their ability to promote wheat growth in the presence of salinity by conducting jar trials under axenic conditions. The rhizobacteria with promising results were tested for their compatibility with each other before developing multi-strain inoculum of PGPR. The compatible PGPR strains were characterized, and multi-strain inoculum was then evaluated for promoting wheat growth under axenic conditions at different salinity levels, i.e., 2.1 (normal soil), 6, 12, and 18 dS m –1 . The most promising combination was further evaluated by conducting a pot trial in the greenhouse. The results showed that compared to a single rhizobacterial strain, better growth-promoting effect was observed when rhizobacterial strains were co-inoculated. The multi-strain consortium of PGPR caused a significant positive impact on shoot length, root length, shoot fresh weight, and root fresh weight of wheat at the highest salinity level in the jar as well as in the pot trial. Results showed that the multi-strain consortium of PGPR caused significant positive effects on the biochemical traits of wheat by decreasing electrolyte leakage and increasing chlorophyll contents, relative water contents (RWC), and K/Na ratio. It can be concluded that a multi-strain consortium of PGPR ( Ensifer adhaerens strain BK-30, Pseudomonas fluorescens strain SN5, and Bacillus megaterium strain SN15) could be more effective to combat the salinity stress owing to the presence of a variety of growth-promoting traits. However, further work is going on to evaluate the efficacy of multi-strain inoculum of PGPR under salt-affected field conditions.
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Claims 6
Claim · model-written summary
A multi-strain consortium of rhizobacteria gave a better growth-promoting effect than a single strain.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- co-inoculatede1
- Interactor
- rhizobacterial strainse1symbiont
- Outcome
- growth-promoting effecte1
- Direction
- bettere1
- Comparator
- single rhizobacterial straine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e1“compared to a single rhizobacterial strain, better growth-promoting effect was observed when rhizobacterial strains were co-inoculated”
Claim · model-written summary
The multi-strain PGPR consortium had a significant positive impact on shoot length and root length of wheat at the highest salinity level.
- Taxon
- wheatTriticum aestivume2
- Treatment
- multi-strain consortium of PGPRe2
- Interactor
- PGPRe2symbiont
- Outcome
- shoot length, root lengthe2
- Direction
- positive impacte2
- Setting
- pot triale2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e2“The multi-strain consortium of PGPR caused a significant positive impact on shoot length, root length, shoot fresh weight, and root fresh weight of wheat at the highest salinity level in the jar as well as in the pot trial”
Claim · model-written summary
The multi-strain PGPR consortium had a significant positive impact on shoot fresh weight and root fresh weight of wheat at the highest salinity level.
- Taxon
- wheatTriticum aestivume2
- Treatment
- multi-strain consortium of PGPRe2
- Interactor
- PGPRe2symbiont
- Outcome
- shoot fresh weight, and root fresh weighte2
- Direction
- positive impacte2
- Setting
- pot triale2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e2“The multi-strain consortium of PGPR caused a significant positive impact on shoot length, root length, shoot fresh weight, and root fresh weight of wheat at the highest salinity level in the jar as well as in the pot trial”
Claim · model-written summary
The multi-strain PGPR consortium decreased electrolyte leakage in wheat.
- Taxon
- wheatTriticum aestivume3
- Treatment
- multi-strain consortium of PGPRe3
- Interactor
- PGPRe3symbiont
- Outcome
- electrolyte leakagee3
- Direction
- decreasinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e3“Results showed that the multi-strain consortium of PGPR caused significant positive effects on the biochemical traits of wheat by decreasing electrolyte leakage and increasing chlorophyll contents, relative water contents (RWC), and K/Na ratio”
Claim · model-written summary
The multi-strain PGPR consortium increased chlorophyll content, relative water content and K/Na ratio in wheat.
- Taxon
- wheatTriticum aestivume3
- Treatment
- multi-strain consortium of PGPRe3
- Interactor
- PGPRe3symbiont
- Outcome
- chlorophyll contents, relative water contents (RWC), and K/Na ratioe3
- Direction
- increasinge3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e3“Results showed that the multi-strain consortium of PGPR caused significant positive effects on the biochemical traits of wheat by decreasing electrolyte leakage and increasing chlorophyll contents, relative water contents (RWC), and K/Na ratio”
Claim · model-written summary
A multi-strain PGPR consortium could be more effective to combat salinity stress in wheat.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- combat the salinity stresse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“improving the growth and yield of wheat”
e4“could be more effective to combat the salinity stress”
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