Influence of plant-growth-promoting bacteria on germination, growth and nutrients’ uptake of<i>Onobrychis sativa</i>L. under drought stress

Delshadi, S.; Ebrahimi, Mahdieh; Shirmohammadi, Ebrahim

doi:10.1080/17429145.2017.1316527

Cited by 68 publications

(31 citation statements)

References 31 publications

(28 reference statements)

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“…Home soil microbiota promoted germination of the legume irrespective of the watering treatment, which supports our argument that the legume would be more dependent on co-evolved soil microbiota than the grass and forb. These results support previous research that found soil and rhizospheric rhizobial bacteria might enhance germination through the production of enzymes and hormones (Kremer 1993, Requena et al 1997, Shweta et al 2008, Miransari and Smith 2009, Delshadi et al 2017a, b, Lozano et al 2017 and that inoculum paired with plants from the same location further promotes these positive effects on germination (Requena et al 1997). The significantly lower germination with away soil microbiota in drier conditions suggests that soil microbiota that promote germination of the legume were absent or had lower activity in the away soil relative to the home soil microbiota.…”

Section: Germinationsupporting

confidence: 91%

Mimicking a rainfall gradient to test the role of soil microbiota for mediating plant responses to drier conditions

O’Brien

Pugnaire

Rodríguez‐Echeverría

et al. 2018

Oikos

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Plant interactions with soil microbiota are important drivers of biodiversity and ecosystem function, but climate change can modify these interactions by directly altering the soil community, which can affect the direction and magnitude of such interactions. We manipulated water quantity and soil microbiota of two populations of three plant species that differ in their interactions with soil microbiota and assessed germination and biomass production under conditions that mimicked a rainfall gradient in southeastern Spain. We assessed the importance of soil microbiota from home and away (drier) sites for alleviating or exacerbating the effects of drier conditions. Our results suggest that home soil microbiota enhanced germination of the legume Trifolium stellatum. Conversely, we found that the grass, Lagurus ovatus, and the forb, Sisymbrium erysimoides, produced more biomass under moderate drying with soil microbiota from a drier site than with home soil microbiota, suggesting that dry‐adapted soil microbiota alleviated the negative effects of drier conditions for these species. This maintenance of productivity with dry‐adapted soil microbiota under drier conditions was found despite simultaneous reductions in leaf dry matter content and root‐to‐shoot ratio that would typically be less optimal traits changes under reduced water availability. Severe water limitation resulted in decreased plant biomass regardless of the plant species and soil inoculum, indicating a threshold effect whereby severe water limitation on growth supersedes the beneficial effects of soil microbiota. Overall, our results show that species identity, the severity of water limitation, and soil microbiota interact to determine the response of plants to drier conditions.

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Section: Germinationsupporting

confidence: 91%

Mimicking a rainfall gradient to test the role of soil microbiota for mediating plant responses to drier conditions

O’Brien

Pugnaire

Rodríguez‐Echeverría

et al. 2018

Oikos

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“…Furthermore, PGPR-inoculated plants were successful in increasing the nitrogen, phosphorus, and potassium uptake into plant biomass [44,46]. Under water deficit, nutrient content (N-P-K) of plant biomass was improved when plants were treated with PGPR, perhaps owing to incremental root growth and root number that exploited more soil volume for efficient absorption of available essential nutrients [47], thus leading to higher biomass production [1]. These results agree with those obtained in [48], who found that plants inoculated with PGPR in soils with a low availability of the essential elements led to increased N, P, and K uptake due to their increased content in the soil after inoculation compared to non-inoculated plants because of the pivotal impact of root morphology and expansion of the root hairs.…”

Section: Discussionmentioning

confidence: 99%

The Coupling Effects of Plant Growth Promoting Rhizobacteria and Salicylic Acid on Physiological Modifications, Yield Traits, and Productivity of Wheat under Water Deficient Conditions

2019

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Water deficit and soil infertility negatively influence the growth, nutrient uptake, and productivity of wheat. Plant growth promoting rhizobacteria (PGPR) and salicylic acid (SA) were evaluated as possible solutions to mitigate the impacts of water deficit on growth, physiology, productivity, and nutrient uptake of wheat (Triticum aestivum L. cv. Sakha 95). Over two growing seasons (2016/2017 and 2017/2018) field experiments were conducted to examine eight combinations of two water treatments (water deficit and well-watered) with four soil and foliar treatments (control, PGPR, SA, and combination of PGPR + SA). The application of PGPR increased soil microbial activity resulting in increased field capacity and available soil water. Likewise, the application of the combined treatment of PGPR and SA significantly increased chlorophyll content, relative water content, stomatal conductance, soil microbial population, and showed inhibitory impacts on proline content, thus improving yield-related traits, productivity, and nutrient uptake (N, P, K) under water deficit compared to the control treatment. The results show that the integrative use of PGPR in association with SA may achieve an efficacious strategy to attenuate the harmful effects of water deficit as well as the amelioration of productivity and nutrient uptake of wheat under water-deficient conditions.

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“…Motility and attachment through biofilm formation also give selective advantage to pathogenic bacteria and are known characteristics of P. syringae [64,65]. To confirm these phenotypes, we first identified motility genes in both organisms, which had nearly 100% conservation to the P. syringae pv.…”

Section: Pathogenicity Of P Syringae Isolatesmentioning

confidence: 99%

Isolation, Characterization, and Pathogenicity of Two Pseudomonas syringae Pathovars from Populus trichocarpa Seeds

et al. 2020

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Pseudomonas syringae is a ubiquitous plant pathogen, infecting both woody and herbaceous plants and resulting in devastating agricultural crop losses. Characterized by a remarkable specificity for plant hosts, P. syringae pathovars utilize a number of virulence factors including the type III secretion system and effector proteins to elicit disease in a particular host species. Here, two Pseudomonas syringae strains were isolated from diseased Populustrichocarpa seeds. The pathovars were capable of inhibiting poplar seed germination and were selective for the Populus genus. Sequencing of the newly described organisms revealed similarity to phylogroup II pathogens and genomic regions associated with woody host-associated plant pathogens, as well as genes for specific virulence factors. The host response to infection, as revealed through metabolomics, is the induction of the stress response through the accumulation of higher-order salicylates. Combined with necrosis on leaf surfaces, the plant appears to quickly respond by isolating infected tissues and mounting an anti-inflammatory defense. This study improves our understanding of the initial host response to epiphytic pathogens in Populus and provides a new model system for studying the effects of a bacterial pathogen on a woody host plant in which both organisms are fully genetically sequenced.

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Influence of plant-growth-promoting bacteria on germination, growth and nutrients’ uptake ofOnobrychis sativaL. under drought stress

Cited by 68 publications

References 31 publications

Mimicking a rainfall gradient to test the role of soil microbiota for mediating plant responses to drier conditions

Mimicking a rainfall gradient to test the role of soil microbiota for mediating plant responses to drier conditions

The Coupling Effects of Plant Growth Promoting Rhizobacteria and Salicylic Acid on Physiological Modifications, Yield Traits, and Productivity of Wheat under Water Deficient Conditions

Isolation, Characterization, and Pathogenicity of Two Pseudomonas syringae Pathovars from Populus trichocarpa Seeds

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