Plant-associated microbiomes in arid lands: diversity, ecology and biotechnological potential

Soussi, Asma; Ferjani, Raoudha; Marasco, Ramona; Guesmi, Amel; Chérif, Hanène; Rolli, Eleonora; Mapelli, Francesca; Ouzari, Hadda; Daffonchio, Daniele; Chérif, Ameur

doi:10.1007/s11104-015-2650-y

Cited by 123 publications

(103 citation statements)

References 95 publications

(2 reference statements)

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“…In arid environments, desert farming favours the selection of drought‐protecting microbial assemblages (Marasco et al ., ; TerHorst et al ., ; Soussi et al ., ) that are enriched and rearranged in the plant rhizosphere and endosphere (Mapelli et al ., ; Marasco et al ., ; ; Cherif et al ., ; Ferjani et al ., ; Santos‐Medellín et al ., ). PGP microorganisms use several mechanisms to stimulate drought tolerance in plants (Vurukonda et al ., ; Etesami and Maheshwari, ): (i) the microbial enzyme 1‐aminocyclopropane‐1‐carboxylate (ACC) deaminase contributes to control the concentration of the plant stress phytohormone ethylene, by degrading its precursor ACC (Glick, ); (ii) microorganisms contribute to modulate plant hormone homeostasis by producing auxin [i.e., indole‐3‐acetic acid (IAA)], cytokinins and giberellins.…”

Section: Introductionmentioning

confidence: 99%

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants

Vigani

Rolli

Marasco

et al. 2018

Environmental Microbiology

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It has been previously shown that the transgenic overexpression of the plant root vacuolar proton pumps H -ATPase (V-ATPase) and H -PPase (V-PPase) confer tolerance to drought. Since plant-root endophytic bacteria can also promote drought tolerance, we hypothesize that such promotion can be associated to the enhancement of the host vacuolar proton pumps expression and activity. To test this hypothesis, we selected two endophytic bacteria endowed with an array of in vitro plant growth promoting traits. Their genome sequences confirmed the presence of traits previously shown to confer drought resistance to plants, such as the synthesis of nitric oxide and of organic volatile organic compounds. We used the two strains on pepper (Capsicuum annuum L.) because of its high sensitivity to drought. Under drought conditions, both strains stimulated a larger root system and enhanced the leaves' photosynthetic activity. By testing the expression and activity of the vacuolar proton pumps, H -ATPase (V-ATPase) and H -PPase (V-PPase), we found that bacterial colonization enhanced V-PPase only. We conclude that the enhanced expression and activity of V-PPase can be favoured by the colonization of drought-tolerance-inducing bacterial endophytes.

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Section: Introductionmentioning

confidence: 99%

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants

Vigani

Rolli

Marasco

et al. 2018

Environmental Microbiology

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“…However, previous research has reported weaker responses of the bacterial alpha-than beta-diversity to the vegetation loss [5,48]. These substantial changes in the bacterial beta-diversity could be due to the substantial percentage of the abundant (19-35%) and rare (21-30%) phylotypes that responded to the vegetation loss across the N-enrichment levels, although previous studies have reported such changes at the phylum level [49]. The large changes in the fungal beta-diversity could be due to the substantial percentage of rare (35-48%) than abundant fungal phylotypes that responded to vegetation loss across N-enrichment levels.…”

Section: Effects Of Vegetation Loss On Microbial Beta Diversity Acrosmentioning

confidence: 83%

Consistent effects of vegetation loss on abundant and rare soil microbial phylotypes across nitrogen-enrichment levels

Chen¹,

Wu²,

Saleem³

et al. 2019

Preprint

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Soil harbors highly diverse abundant and rare microbial phylotypes that drive multiple soil functions. Given increasing intensity and frequency of vegetation loss and anthropogenic reactive nitrogen (N) inputs to the soil in the future, we lack a mechanistic understanding of how vegetation loss may influence abundant and rare microbial phylotypes at various N-enrichment levels. In the current study, we assessed the effects of vegetation loss on abundant and rare phylotypes of soil bacteria and fungi across three N-enrichment levels in a semi-arid grassland ecosystem. After six years of experimentation in with and without vegetation plots, the vegetation loss increased the total relative abundance of abundant soil bacterial phylotypes but not that of abundant fungal phylotypes at across N-enrichment levels. It is very likely because the number of abundant bacterial phylotypes with positive than negative responses to vegetation loss was higher; however, the number of abundant fungal phylotypes with positive than negative responses to vegetation loss was similar during this period. Moreover, the vegetation loss did not alter the alpha-diversity of abundant or rare bacterial phylotypes, or, of abundant fungal phylotypes; however, it reduced the alpha-diversity of rare fungal phylotypes at across N-enrichment levels. The vegetation loss, however, altered the beta-diversity of abundant and rare bacterial and fungal phylotypes across N-enrichment levels. We found that, against expectations, the effects of vegetation loss on the diversity of abundant and rare phylotypes of both bacteria and fungi were relatively consistent across N-enrichment levels. Our findings provide, for the first time, the phylotype-based data on how vegetation loss affects abundant and rare phylotypes of soil bacteria and fungi across N-enrichment levels. The results also indicate that the effects of vegetation loss on belowground functions may be relatively insensitive to the differences in the N-deposition rates.

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“…Endophytes that reside inside the plant tissues not only take care of its host plant health but also fight against the plant pathogens which can be extended its usage as bioinoculants for field crops. Antagonistic activity exhibited by bacterial endophytes makes them suitable for the use of biocontrol agents and these endophytes colonize actively in the host plant tissues and establish a beneficial lifelong active association with the plant without harming them [1,2,3,4,5,6]. The endophytic microbial community finds its entry into the host tissues from the rhizosphere zone in the soil [7].…”

Section: Introductionmentioning

confidence: 99%

In vitro Evaluation of Bacterial Endophytes for Biocontrol of Pythium aphanidermatum and Plant Growth Promotion in Setaria italica L. Grown in Seedling Trays

Reddy

Shivaprakash²,

Adithya³

2019

CJAST

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An investigation study was carried to test the ability of endophytic bacteria isolated from small millets as a biocontrol agent against the fungal pathogen Pythium aphanidermatum, the causal organism of sheath blight in foxtail millet (Setaria italica L.) grown in seedling trays under greenhouse conditions. In total twelve bacterial endophytes were isolated out of which six isolates produced β -1, 3 glucanases, 11 isolates produced chitinases and 12 isolates produced siderophores under in-vitro conditions. All these bacterial endophytic isolates inhibited mycelial growth of Pythium aphanidermatum in plate assay and liquid culture and the highest percent inhibition of mycelium was recorded in KMS5 (44.44%) followed by KMS1 (38.89%). In seedling Reddy et al.; CJAST, 38(6): 1-14, 2019; Article no.CJAST.52777 2 trays, BMR7 and KMS5 (81.66%) had recorded the highest percent germination followed by KMS1 (79.62%) and KMS1 and KMS5 took 10.85 and 10.55 days respectively for 50% seed germination compared to control (13.50 days) which was treated with pathogen alone. Lowest pre-emergence disease incidence was noticed in KMS5 (14.03%) followed by KMS1 (16.18%) whereas T1 (Control) recorded maximum pre-emergence disease incidence (39.82%) was observed. Least post-emergence disease incidence (11.36) and biocontrol efficacy (68.74%) was recorded with KMS5. Apart from showing antagonistic activity, KMS5 had recorded a significantly higher seedling vigor index (2712.97), root length (18.12 cm), shoot length (15.10 cm), root dry weight (0.158 g) and shoot dry weight (0.76 g) compared to other bacterial endophytic isolates. Original Research Article

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Plant-associated microbiomes in arid lands: diversity, ecology and biotechnological potential

Abstract: 17Background Aridification is a worldwide serious threat directly affecting agriculture and crop production. In arid

Cited by 123 publications

References 95 publications

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants

Consistent effects of vegetation loss on abundant and rare soil microbial phylotypes across nitrogen-enrichment levels

In vitro Evaluation of Bacterial Endophytes for Biocontrol of Pythium aphanidermatum and Plant Growth Promotion in Setaria italica L. Grown in Seedling Trays

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Plant-associated microbiomes in arid lands: diversity, ecology and biotechnological potential

Abstract: 17Background Aridification is a worldwide serious threat directly affecting agriculture and crop production. In arid

Cited by 123 publications

References 95 publications

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H+‐pumping pyrophosphatase in pepper plants

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H+‐pumping pyrophosphatase in pepper plants

Consistent effects of vegetation loss on abundant and rare soil microbial phylotypes across nitrogen-enrichment levels

In vitro Evaluation of Bacterial Endophytes for Biocontrol of Pythium aphanidermatum and Plant Growth Promotion in Setaria italica L. Grown in Seedling Trays

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Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants

Root bacterial endophytes confer drought resistance and enhance expression and activity of a vacuolar H⁺‐pumping pyrophosphatase in pepper plants