Bacillus strains exhibit various plant growth promoting traits and their biofilm-forming capability correlates to their salt stress alleviation effect on maize seedlings

Çam, Sedat; Küçük, Çiğdem; Almaca, Ahmet

doi:10.1016/j.jbiotec.2023.05.004

Cited by 19 publications

(3 citation statements)

References 43 publications

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“…Another Actinomycete was reported to promote the growth of a halophyte using irrigation with seawater. Some biofilm-forming strains of Bacillus have been shown to enhance the growth of maize in saline conditions [82,83]. Another example is Bacillus subtilis (GB03), which was identified as a rhizosphere bacterium that stimulates growth of white clover under saline conditions [84], and which has since been renamed Bacillus amyloliquifaciens GB03 [85,86].…”

Section: Halophilic Bacteria With Pgpb Potentialmentioning

confidence: 99%

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Halophilic Plant-Associated Bacteria with Plant-Growth-Promoting Potential

Meinzer,

Ahmad,

Nielsen

2023

Microorganisms

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The salinization of soils is a growing agricultural concern worldwide. Irrigation practices, drought, and climate change are leading to elevated salinity levels in many regions, resulting in reduced crop yields. However, there is potential for a solution in the microbiome of halophytes, which are naturally salt-tolerant plants. These plants harbor a salt-tolerant microbiome in their rhizosphere (around roots) and endosphere (within plant tissue). These bacteria may play a significant role in conferring salt tolerance to the host plants. This leads to the possibility of transferring these beneficial bacteria, known as salt-tolerant plant-growth-promoting bacteria (ST-PGPB), to salt-sensitive plants, enabling them to grow in salt-affected areas to improve crop productivity. In this review, the background of salt-tolerant microbiomes is discussed and their potential use as ST-PGPB inocula is explored. We focus on two Gram-negative bacterial genera, Halomonas and Kushneria, which are commonly found in highly saline environments. These genera have been found to be associated with some halophytes, suggesting their potential for facilitating ST-PGPB activity. The study of salt-tolerant microbiomes and their use as PGPB holds promise for addressing the challenges posed by soil salinity in the context of efforts to improve crop growth in salt-affected areas.

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Section: Halophilic Bacteria With Pgpb Potentialmentioning

confidence: 99%

“…Solubilization and translocation of ions such as phosphate and iron (by siderophores) to the plant. Phosphate and iron are critical to the plant but are often in low abundance or present only in inorganic forms that must be solubilized for use by plants ( [82,83], Table 1). The plants were inoculated with the bacteria and grown under NaCl-alkali regimes.…”

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confidence: 99%

Halophilic Plant-Associated Bacteria with Plant-Growth-Promoting Potential

Meinzer,

Ahmad,

Nielsen

2023

Microorganisms

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“…This inhibition contributes to the improvement of wheat growth [30]. Several studies now provide multidimensional evidence for the salt stress-reducing effect of injection of different Bacillus species in various crops such as lettuce [31], maize [32], wheat [33,34], chickpea [35], and quinoa [36].…”

Section: Introductionmentioning

confidence: 99%

The Coupling Effects of PGPR Inoculation and Foliar Spraying of Strigolactone in Mitigating the Negative Effect of Salt Stress in Wheat Plants: Insights from Phytochemical, Growth, and Yield Attributes

Mehrabi,

Sabokdast,

Bihamta

et al. 2024

Agriculture

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Salt stress has detrimental effects on wheat plants at several physiological, biochemical, and molecular levels. This stress leads to suppressed growth, reduced grain yield, and poor quality of harvested grains. However, two approaches have shown promise for improving wheat salt tolerance: using a synthetic strigolactone analog called GR24 and applying plant growth-promoting rhizobacteria (PGPR). GR24 plays a vital role in regulating plant growth and development and in defense against various stresses. Conversely, PGPR are beneficial bacteria that colonize the rhizosphere of plants and promote their growth through multiple mechanisms. In our study, we investigated the effects of salinity on the growth and yield traits of two different wheat cultivars and explored the combined role of PGPR and GR24 in mitigating the impact of salt stress. We created three different salinity levels using NaCl in pots (original, 5 dS m−1, and 10 dS m−1) and inoculated wheat seeds with a salt-tolerant Bacillus velezensis UTB96 strain. In addition, we applied 10 μM GR24 via foliar application during the pollination stage. Our observations showed that salt stress negatively affected wheat’s growth, yield, and phytochemical properties compared to the control. However, both single and combined applications of PGPR and GR24 mitigated the adverse effects of salinity. The combined treatment had a more substantial impact than either alone in inducing and improving biochemical and ionic characteristics. These included decreasing Na+ content in both leaves and roots, and EL, H2O2, and MDA content in leaves while increasing K+ content in both leaves and roots, growth and yield-related traits, RWC, chlorophyll pigments, total protein, soluble sugar, starch, proline, GB, and antioxidant enzyme activity (APX, POX, and CAT) of leaves. In conclusion, integrating PGPR and GR24 can efficiently induce salt tolerance and improve plant growth under stressed conditions. This combined approach has the potential for broad applicability in supporting plant growth in the presence of salt stress.

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The biocontrol strain Bacillus mojavensis KRS009 confers resistance to cotton Verticillium wilt and improves tolerance to salt stress

Zhao,

Wang,

Liu

et al. 2024

New Plant Protection

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Biological control has gained increasing attention as a strategy to address biotic and abiotic stresses in crops. In this study, we identified the strain KRS009 as Bacillus mojavensis through morphological identification and multilocus sequence analysis. KRS009 exhibited broad‐spectrum antifungal activity against various phytopathogenic fungi by secreting soluble and volatile compounds. Additionally, the physio‐biochemical traits of strain KRS009 were characterized, including its growth‐promoting capabilities and active enzymes. Notably, KRS009 demonstrated the capacity for biofilm formation and exhibited tolerance to saline‐alkali conditions. The biological security evaluation confirmed the safety of KRS009 for both humans and plants. Furthermore, strain KRS009 was found to trigger plant immunity by inducing systemic resistance through salicylic acid‐ and jasmonic acid‐dependent signaling pathways. Greenhouse experiments conducted on cotton plants proved that the treatment with strain KRS009 effectively protected cotton against Verticillium wilt caused by Verticillium dahliae and promoted the growth of cotton under salt stress. These findings highlight the potential of B. mojavensis KRS009 as a promising biocontrol and biofertilizer agent for promoting plant growth, combating fungal diseases and mitigating salt stress in plants.

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Bacillus strains exhibit various plant growth promoting traits and their biofilm-forming capability correlates to their salt stress alleviation effect on maize seedlings

Cited by 19 publications

References 43 publications

Halophilic Plant-Associated Bacteria with Plant-Growth-Promoting Potential

Halophilic Plant-Associated Bacteria with Plant-Growth-Promoting Potential

The Coupling Effects of PGPR Inoculation and Foliar Spraying of Strigolactone in Mitigating the Negative Effect of Salt Stress in Wheat Plants: Insights from Phytochemical, Growth, and Yield Attributes

The biocontrol strain Bacillus mojavensis KRS009 confers resistance to cotton Verticillium wilt and improves tolerance to salt stress

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