Rice seed endophytes transmit into the plant seedling, promote plant growth and inhibit fungal phytopathogens

Jana, Santosh Kumar; Islam, Ataul; Hore, Samrat; Mandal, Sukhendu

doi:10.1007/s10725-022-00914-w

Cited by 22 publications

(7 citation statements)

References 48 publications

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“…increased seedling vigor, germination %, and P and K uptake by okra plants under salt stress. Jana et al ( 2023 ) demonstrated the positive contribution of Citrobacter, Pantoae , and Flavobacterium in improving seedling vigor and germination rate. In terms of improved tomato plant growth, tissue K + content, and soil residual matter (Raji and Thangavelu, 2021 ), similar outcomes of K-solubilizing Bacillus and Bruckholdoria sp.…”

Section: Discussionmentioning

confidence: 99%

Contribution of potassium solubilizing bacteria in improved potassium assimilation and cytosolic K+/Na+ ratio in rice (Oryza sativa L.) under saline-sodic conditions

Nawaz,

Qamar,

Marghoob

et al. 2023

Front. Microbiol.

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Sodium-induced potassium (K+) deficiency is more prevalent in salt-affected soils. Plants experience K+ starvation thus cytosolic K+/Na+ ratio is lowered, which is a prerequisite for their survival. K+ enrichment in crops can be acquired via K-solubilizing bacteria as a sustainable green agriculture approach. This study was conducted to explore potent K-solubilizing bacteria from the rhizosphere of wheat, rice, and native flora grown in salt-affected soils in two distinct regions of Pakistan. The aim of this work was to evaluate the contribution of microbial consortiums to the improvement of K+ assimilation and cytosolic K+/Na+ ratios in rice crops under saline-sodic conditions. Among 250 bacterial isolates, 9 were selected based on their salt (11% NaCl) and alkali (9) tolerance and K-solubilization indices (1.57–5.67). These bacterial strains were characterized for their plant growth-promoting traits and identified based on 16S rRNA gene sequencing. A consortium of five strains, namely, Enterobacter hormaechei, Citrobacter braakii, Pseudomonas putida, Erwinia iniecta, and Pantoea agglomerans, was used as a bio-inoculant to evaluate its role in K+ assimilation, cytosolic K+/Na+ ratio, and subsequent yield enhancement in rice grown under saline-sodic conditions. The impact of applied consortium on rice was assessed under variable salt levels (Control, 40, 80, and 120 mM) in a pot experiment and under natural saline-sodic conditions in the field. Plant agronomical parameters were significantly higher in the bacterial consortium-treated plants, with a concomitant increase in K+-uptake in root and shoot (0.56 and 0.35 mg g−1 dry wt.) of the salt-tolerant rice variety Shaheen. The root K+/Na+ ratio was significantly improved (200% in 40 mM and 126% in 80 mM NaCl) and in the shoot (99% in 40 mM and 131% in 80 mM) too. A similar significant increase was also observed in the salt-susceptible variety Kainat. Moreover, grain yield (30.39 g/1,000 grains wt.) and biomass (8.75 g) of the rice variety Shaheen, grown in field conditions, were also improved. It can be concluded that K-solubilizing bacteria can be used as bio-inoculants, contributing to growth and yield increment via enhanced K-assimilation and cytosolic K+/Na+ ratio in rice crops under salt stress.

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Section: Discussionmentioning

confidence: 99%

Contribution of potassium solubilizing bacteria in improved potassium assimilation and cytosolic K+/Na+ ratio in rice (Oryza sativa L.) under saline-sodic conditions

Nawaz,

Qamar,

Marghoob

et al. 2023

Front. Microbiol.

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“…Produce ammonia, which can be used by the plant as a N source and can act as a biocontrol agent against pathogenic microorganisms (namely phytopathogenic fungi), which tend to proliferate under high salinity [ 38 , 41 ];…”

Section: Discussionmentioning

confidence: 99%

“…Given lactones’ importance in mediating microbe–microbe and plant–microbe communication [ 79 , 80 ], it is likely that bacterial strains without esterase activity (i.e., S3) will not produce lactone precursors, and therefore may not interact so closely with the plant host. Furthermore, as high salinity promotes some fungal soil-borne diseases in plants [ 38 ], the fact that S3 also did not produce HCN may have decreased its capacity as a biocontrol agent, especially against fungal phytopathogens through inhibition of mycelial growth [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…For example, the presence of PGPB capable of producing hydrogen cyanide (HCN) and ammonia (NH 3 ) can play a crucial role in the biocontrol of fungal phytopathogens through inhibition of mycelial growth. While the synthesis of HCN inhibits cytochrome C oxidase and other important metalloproteins [ 40 ], the release of NH 3 by PGPB impairs the growth of certain fungi and inhibits the germination of several fungal spores [ 41 ]. Furthermore, some PGPB can control phytopathogens with other non-exclusive mechanisms including:…”

Section: Introductionmentioning

confidence: 99%

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The Plant Growth-Promoting Potential of Halotolerant Bacteria Is Not Phylogenetically Determined: Evidence from Two Bacillus megaterium Strains Isolated from Saline Soils Used to Grow Wheat

et al. 2023

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(1) Background: Increasing salinity, further potentiated by climate change and soil degradation, will jeopardize food security even more. Therefore, there is an urgent need for sustainable agricultural practices capable of maintaining high crop yields despite adverse conditions. Here, we tested if wheat, a salt-sensitive crop, could be a good reservoir for halotolerant bacteria with plant growth-promoting (PGP) capabilities. (2) Methods: We used two agricultural soils from Algeria, which differ in salinity but are both used to grow wheat. Soil halotolerant bacterial strains were isolated and screened for 12 PGP traits related to phytohormone production, improved nitrogen and phosphorus availability, nutrient cycling, and plant defence. The four ‘most promising’ halotolerant PGPB strains were tested hydroponically on wheat by measuring their effect on germination, survival, and biomass along a salinity gradient. (3) Results: Two halotolerant bacterial strains with PGP traits were isolated from the non-saline soil and were identified as Bacillus subtilis and Pseudomonas fluorescens, and another two halotolerant bacterial strains with PGP traits were isolated from the saline soil and identified as B. megaterium. When grown under 250 mM of NaCl, only the inoculated wheat seedlings survived. The halotolerant bacterial strain that displayed all 12 PGP traits and promoted seed germination and plant growth the most was one of the B. megaterium strains isolated from the saline soil. Although they both belonged to the B. megaterium clade and displayed a remarkable halotolerance, the two bacterial strains isolated from the saline soil differed in two PGP traits and had different effects on plant performance, which clearly shows that PGP potential is not phylogenetically determined. (4) Conclusions: Our data highlight that salt-sensitive plants and non-saline soils can be reservoirs for halotolerant microbes with the potential to become effective and sustainable strategies to improve plant tolerance to salinity. However, these strains need to be tested under field conditions and with more crops before being considered biofertilizer candidates.

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“…Seed-associated microorganisms such as Bacillus sp., Citrobacter sp., Flavobacterium sp., and Pantoea sp. can enhance nutrient solubilization [ 112 ]. Ribeiro et al [ 113 ] determined the ability of endophytic Bacillus spp.…”

Section: Metabolic Responses Of Plants and Their Associated Microorga...mentioning

confidence: 99%

Juvenile Plant–Microbe Interactions Modulate the Adaptation and Response of Forest Seedlings to Rapid Climate Change

Sanhueza,

Hernández,

Sagredo-Sáez

et al. 2024

Plants

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The negative impacts of climate change on native forest ecosystems have created challenging conditions for the sustainability of natural forest regeneration. These challenges arise primarily from abiotic stresses that affect the early stages of forest tree development. While there is extensive evidence on the diversity of juvenile microbial symbioses in agricultural and fruit crops, there is a notable lack of reports on native forest plants. This review aims to summarize the critical studies conducted on the diversity of juvenile plant–microbe interactions in forest plants and to highlight the main benefits of beneficial microorganisms in overcoming environmental stresses such as drought, high and low temperatures, metal(loid) toxicity, nutrient deficiency, and salinity. The reviewed studies have consistently demonstrated the positive effects of juvenile plant–microbiota interactions and have highlighted the potential beneficial attributes to improve plantlet development. In addition, this review discusses the beneficial attributes of managing juvenile plant–microbiota symbiosis in the context of native forest restoration, including its impact on plant responses to phytopathogens, promotion of nutrient uptake, facilitation of seedling adaptation, resource exchange through shared hyphal networks, stimulation of native soil microbial communities, and modulation of gene and protein expression to enhance adaptation to adverse environmental conditions.

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Rice seed endophytes transmit into the plant seedling, promote plant growth and inhibit fungal phytopathogens

Cited by 22 publications

References 48 publications

Contribution of potassium solubilizing bacteria in improved potassium assimilation and cytosolic K+/Na+ ratio in rice (Oryza sativa L.) under saline-sodic conditions

Contribution of potassium solubilizing bacteria in improved potassium assimilation and cytosolic K+/Na+ ratio in rice (Oryza sativa L.) under saline-sodic conditions

The Plant Growth-Promoting Potential of Halotolerant Bacteria Is Not Phylogenetically Determined: Evidence from Two Bacillus megaterium Strains Isolated from Saline Soils Used to Grow Wheat

Juvenile Plant–Microbe Interactions Modulate the Adaptation and Response of Forest Seedlings to Rapid Climate Change

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