Soil parameters drive the diversity of Citrus sinensis rhizosphere microbiota which exhibits a potential in plant drought stress alleviation

Cherni, Marwa; Ferjani, Raoudha; Mapelli, Francesca; Boudabous, Abdellatif; Borin, Sara; Ouzari, Hadda‐Imene

doi:10.1016/j.apsoil.2018.12.006

Cited by 22 publications

(16 citation statements)

References 81 publications

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“…Here, we also observed this pattern except for Chloroflexi, which we only found in an abundance of around 1% in orange tree roots and which is known for multiple adaptation mechanisms to harsh environments (Lacap et al, 2011). Moreover, Proteobacteria and Firmicutes were reported as the most abundant phyla under drought stress for orange trees (Cherni et al, 2019) but we observed a high abundance of Bacteroidetes, instead of Firmicutes, and Proteobacteria in all three crops. Contrary to the climatic conditions in our study, it was reported that both Firmicutes and Bacteroidetes increased in abundance under heavy rain and low temperatures (Št'ovíček et al, 2017).…”

Section: Discussionsupporting

confidence: 73%

“…For semi-arid ecosystems, it has been shown that bacterial assemblies of adapted plants have a reduced diversity and are strongly influenced by climatological parameters (Taketani et al, 2017). In places with soil aridity and drought, rhizosphere microbiota is driven by plant drought stress alleviation and/or adaptation to environmental conditions (Cherni et al, 2019; see Jansson and Hofmockel, 2019 for a review). For example, Acidobacteria was shown to decrease in abundance as aridity increases, while Chloroflexi and Proteobacteria showed the opposite behavior (Maestre et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Temporal Dynamics of Rhizobacteria Found in Pequin Pepper, Soybean, and Orange Trees Growing in a Semi-arid Ecosystem

Diaz-Garza

Fierro-Rivera

Pacheco

et al. 2020

Front. Sustain. Food Syst.

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Harsh environmental conditions in drylands force plants and their associated microbial communities to adapt to abiotic stresses. In semi-arid environments, climatic conditions and poor agricultural management have a strong impact on plant yield and thus, enhancing soil fertility by means of beneficial microorganisms such as plant growth-promoting rhizobacteria (PGPR) has been proposed as part of sustainable agricultural management. As drylands will increase due to climate change, studying microbial community dynamics of crops under such conditions is crucial as it might favor rhizobacteria adapted to drought. While the microbiome of many native dryland crops has been characterized, the microbial community composition from non-native crops under semi-arid environmental conditions is understudied. Thus, the aim of this study was to characterize the bacterial community associated with the roots of three crops with different growth cycles, cultivated in the same semi-arid environment, to understand their microbial community composition during the season with the highest temperature in northeast Mexico. We performed high throughput sequencing of the V3-V4 region of the 16S rRNA gene from root samples of Pequin pepper, soybean and orange trees. Classified taxa were evaluated according to crop, sampling time and climatological parameters. Our findings revealed that changes in temporal dynamics of microbial communities correlate with environmental temperature. Moreover, the microbial community of pepper was more diverse and differed from that of soybean and orange. Regarding PGPR, 47.6% of the genera were shared among crops with a high relative abundance of Bacillus, but we also detected crop-specific microbial associations where Serratia was specific to orange trees and Rhodobacter to pepper. When analyzing PGPR in correlation to climatological parameters, Bacillus was found to thrive under lower precipitation rates, higher temperatures and higher evaporation rates in pepper and orange. In contrast, some PGPR commonly used in commercial biofertilizers such as Rhizobium and Azospirillum were affected by high temperatures. This study provides a better understanding of the rhizobacterial assemblies of economically relevant crops grown under a semi-arid environment.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Temporal Dynamics of Rhizobacteria Found in Pequin Pepper, Soybean, and Orange Trees Growing in a Semi-arid Ecosystem

Diaz-Garza

Fierro-Rivera

Pacheco

et al. 2020

Front. Sustain. Food Syst.

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“…Plant growth and adaptation to the environmental conditions are strongly supported by the plant microbiome [10]. In the past years, extremophilic plants and their associated microbiota have been largely studied [11][12][13] aiming at the exploitation of beneficial microbe-plant interactions to boost plant growth and productivity under harsh conditions such as soil salinity [14][15][16][17] and water shortage [18][19][20][21][22]. In this framework, experimental protocols have been established in the last years to effectively combine plant seeds and extremophilic microbes that are able to cope with desiccation and to promote the plant growth under drought conditions [23].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Microbiota Diversity of the Xerophyte Argania spinosa L. Skeels Root System and Residuesphere

et al. 2020

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The microbiota associated to xerophyte is a “black box” that might include microbes involved in plant adaptation to the extreme conditions that characterize their habitat, like water shortage. In this work, we studied the bacterial communities inhabiting the root system of Argania spinosa L. Skeels, a tree of high economic value and ecological relevance in Northern Africa. Illumina 16S rRNA gene sequencing and cultivation techniques were applied to unravel the bacterial microbiota’s structure in environmental niches associated to argan plants (i.e., root endosphere, rhizosphere, root-surrounding soil), not associated to the plant (i.e., bulk soil), and indirectly influenced by the plant being partially composed by its leafy residue and the associated microbes (i.e., residuesphere). Illumina dataset indicated that the root system portions of A. spinosa hosted different bacterial communities according to their degree of association with the plant, enriching for taxa typical of the plant microbiome. Similar alpha- and beta-diversity trends were observed for the total microbiota and its cultivable fraction, which included 371 isolates. In particular, the residuesphere was the niche with the highest bacterial diversity. The Plant Growth Promotion (PGP) potential of 219 isolates was investigated in vitro, assessing several traits related to biofertilization and biocontrol, besides the production of exopolysaccharides. Most of the multivalent isolates showing the higher PGP score were identified in the residuesphere, suggesting it as a habitat that favor their proliferation. We hypothesized that these bacteria can contribute, in partnership with the argan root system, to the litter effect played by this tree in its native arid lands.

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“…Water scarcity is one of the most serious concerns in plant biology which influences the physiological phenomena of plant growth, development, and consequently the productivity (Annicchiarico and Piano 2004;Cherni et al 2019). Decreases in the photosynthetic activities (Ulrich et al 2019), relative water content and the rate of usual transpiration (Yang et al 2019), and over-production of reactive oxygen species (ROS) (Sarwar et al 2019) that causes serious damages to DNA, RNA, proteins and cellular membranes, are some of the deleterious effects caused by drought stress in plants.…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological changes in carrots by foliar γ-aminobutyric acid under drought stress

et al. 2020

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The present study was aimed to investigate the effects of foliar spray of γ-aminobutyric acid (GABA) on the morpho-physiological traits of water-stressed carrot cultivars (Supertaj and Bharat). The different levels of GABA (0, 1, 2, and 4 mM) were sprayed after 20 days of carrot germination grown under 100% and 50% field capacity of soil moisture. The samples were taken after 2 weeks of GABA application and morphological characteristics, integrity of cell-membrane, photosynthetic pigments, and enzymatic antioxidants were measured. The results revealed that the foliar application of GABA improved the vegetative growth and significantly increased the levels of free amino acids, plastid pigments, enzymatic antioxidants, and the relative water content in the roots grown under 50% field capacity as compared to control. Additionally, the GABA application decreased the electrolyte leakage of ions and malondialdehyde content in carrot leaves. The protein contents of GABA-treated carrot plants did not significantly vary with untreated plants. In conclusion, the application of GABA for the production of carrots may help plants to mitigate the adverse effects of water deficit stress.

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Soil parameters drive the diversity of Citrus sinensis rhizosphere microbiota which exhibits a potential in plant drought stress alleviation

Cited by 22 publications

References 81 publications

Temporal Dynamics of Rhizobacteria Found in Pequin Pepper, Soybean, and Orange Trees Growing in a Semi-arid Ecosystem

Temporal Dynamics of Rhizobacteria Found in Pequin Pepper, Soybean, and Orange Trees Growing in a Semi-arid Ecosystem

Unveiling the Microbiota Diversity of the Xerophyte Argania spinosa L. Skeels Root System and Residuesphere

Morpho-physiological changes in carrots by foliar γ-aminobutyric acid under drought stress

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