Deciphering the Symbiotic Plant Microbiome: Translating the Most Recent Discoveries on Rhizobia for the Improvement of Agricultural Practices in Metal-Contaminated and High Saline Lands

Bellabarba, Agnese; Fagorzi, Camilla; diCenzo, George C.; Pini, Francesco; Viti, Carlo; Checcucci, Alice

doi:10.3390/agronomy9090529

Cited by 40 publications

(22 citation statements)

References 205 publications

(236 reference statements)

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“…Rhizosphere engineering through the use of plant growth-promoting rhizobacteria is a valuable strategy that allows crop tolerance to salinity and subsequent promotion of plant productivity and yield under saline condition [3,4,9]. Plant growth-promoting bacteria (PGPB) stimulate plant growth [10] with two different lifestyles: free-living soil bacteria associated with the root surface of many different plant species referred to as plant growth-promoting rhizobacteria (PGPR) [4,11,12] and those that live inside host plant tissues [3,4,13].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

et al. 2021

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There is a great interest in mitigating soil salinity that limits plant growth and productivity. In this study, eighty-nine strains were isolated from the rhizosphere and endosphere of two halophyte species (Suaeda mollis and Salsola tetrandra) collected from three chotts in Algeria. They were screened for diverse plant growth-promoting traits, antifungal activity and tolerance to different physico-chemical conditions (pH, PEG, and NaCl) to evaluate their efficiency in mitigating salt stress and enhancing the growth of Arabidopsis thaliana and durum wheat under NaCl–stress conditions. Three bacterial strains BR5, OR15, and RB13 were finally selected and identified as Bacillus atropheus. The Bacterial strains (separately and combined) were then used for inoculating Arabidopsis thaliana and durum wheat during the seed germination stage under NaCl stress conditions. Results indicated that inoculation of both plant spp. with the bacterial strains separately or combined considerably improved the growth parameters. Three soils with different salinity levels (S1 = 0.48, S2 = 3.81, and S3 = 2.80 mS/cm) were used to investigate the effects of selected strains (BR5, OR15, and RB13; separately and combined) on several growth parameters of wheat plants. The inoculation (notably the multi-strain consortium) proved a better approach to increase the chlorophyll and carotenoid contents as compared to control plants. However, proline content, lipid peroxidation, and activities of antioxidant enzymes decreased after inoculation with the plant growth-promoting rhizobacteria (PGPR) that can attenuate the adverse effects of salt stress by reducing the reactive oxygen species (ROS) production. These results indicated that under saline soil conditions, halotolerant PGPR strains are promising candidates as biofertilizers under salt stress conditions.

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Section: Introductionmentioning

confidence: 99%

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

et al. 2021

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“…Actually, the success of microbial inoculants' performance can be increased by precision farming methods, such as fertigation, which delivers the bioinoculants in the root area, thereby minimizing loss and interference with other liquid chemical inputs such as fertilizers, herbicides, pesticides and growth hormones, still used periodically (Bharathi et al, 2017). Furthermore, seed coating is widely used in agricultural practice, thanks to its beneficial impact on seed performance and plant productivity.…”

Section: Holobiont Improvement Programs Toward Precision Agriculturementioning

confidence: 99%

Legume tasters: symbiotic rhizobia host preference and smart inoculant formulations

Cangioli

Checcucci

Mengoni

et al. 2021

BioComm

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Mutualistic interactions have great importance in ecology, with genetic information that takes shape through interactions within the symbiotic partners and between the partners and the environment. It is known that variation of the host-associated microbiome contributes to buffer adaptation challenges of the host’s physiology when facing varying environmental conditions. In agriculture, pivotal examples are symbiotic nitrogen-fixing rhizobia, known to contribute greatly to host (legume plants) adaptation and host productivity. A holistic view of increasing crop yield and resistance to biotic and abiotic stresses is that of microbiome engineering, the exploitation of a host-associated microbiome through its rationally designed manipulation with synthetic microbial communities. However, several studies highlighted that the expression of the desired phenotype in the host resides in species-specific, even genotype-specific interactions between the symbiotic partners. Consequently, there is a need to dissect such an intimate level of interaction, aiming to identify the main genetic components in both partners playing a role in symbiotic differences/host preferences. In the present paper, while briefly reviewing the knowledge and the challenges in plant–microbe interaction and rhizobial studies, we aim to promote research on genotype x genotype interaction between rhizobia and host plants for a rational design of synthetic symbiotic nitrogen-fixing microbial communities to be used for sustainably improving leguminous plants yield.

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“…Furthermore, water deficiency, salinity, heavy metals, acidity, as well as low nutrients levels are all abiotic factor that frequently can interfere with the role of rhizobia in the rhizosphere scene (Fagorzi et al, 2018;Bellabarba et al, 2019).…”

Section: The Place Of Rhizobia: Setting Up the Scenementioning

confidence: 99%

The Rhizosphere Talk Show: The Rhizobia on Stage

Checcucci¹,

Marchetti²

2020

Front. Agron.

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From bacterial quorum sensing to the signals of bees, communication is the basis of biotic interactions. Frequently, more than two organisms can take part in the speeches, resulting in a complex network of cross-talks. Recent advances in plant-microbe interactions research have shown that communication, both inter-kingdom and intra-kingdom, is shaped by a broad spectrum of factors. In this context, the rhizosphere (i.e., the soil close to the root surface) provides a specific microhabitat where complex interactions occur. The complex environment that makes up the rhizosphere can select for certain microbial populations, which are adapted to this unique niche. Among them, rhizobia have emerged as an important component of the rhizospheric microbiome. The aim of this review is to explore the components of such a rhizospheric Talk Show in the frame of the rhizobium-legume interactions. This symbiosis is a complex process that involves several signals that can be shaped by plant rhizospheric exudates and microbiome composition. The relationship established by rhizobia with other rhizospheric organisms, together with the influence of the environmental factors, results in their beneficial role on host plant health. Here, we resume research accounting strategies, molecules, and organisms that influence the place of rhizobia in the rhizosphere. The focus is on the most recent approaches for the study and subsequent exploitation of the diversity of the organisms. Indeed, the study of plant-microbes communication and evolution is fundamental to develop highly efficient inoculants able to reduce the use of fertilizers in agriculture.

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Deciphering the Symbiotic Plant Microbiome: Translating the Most Recent Discoveries on Rhizobia for the Improvement of Agricultural Practices in Metal-Contaminated and High Saline Lands

Cited by 40 publications

References 205 publications

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

Mitigation of NaCl Stress in Wheat by Rhizosphere Engineering Using Salt Habitat Adapted PGPR Halotolerant Bacteria

Legume tasters: symbiotic rhizobia host preference and smart inoculant formulations

The Rhizosphere Talk Show: The Rhizobia on Stage

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