Potential of Rhizosphere Bacteria for Improving Rhizobium-Legume Symbiosis

Mehboob, Ijaz; Naveed, Muhammad; Zahir, Zahir A.; Sessitsch, Angela

doi:10.1007/978-81-322-1287-4_12

Cited by 18 publications

(13 citation statements)

References 181 publications

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“…The specific mechanisms underlying effects elicited by multiple microbial root colonizers are not well understood, in part owing to a lack of immune-pathway mutants for model legumes as well as logistical challenges associated with manipulating plant microbiomes [20,[38][39][40]. There are several potential mechanisms by which such effects might be produced, including PGPR facilitation of additional colonization sites for rhizobia, PGPR production of plant hormones, direct effects of PGPR colonization on ethylene levels, and PGPR stimulation of flavonoid production by roots [39]. The failure to observe strong effects of D. acidovorans in isolation is consistent with the latter explanation, as in this scenario the benefits of D. acidovorans for the host occur indirectly via the induced [39,41] to improve the performance of B. japonicum.…”

Section: Discussionmentioning

confidence: 99%

“…There are several potential mechanisms by which such effects might be produced, including PGPR facilitation of additional colonization sites for rhizobia, PGPR production of plant hormones, direct effects of PGPR colonization on ethylene levels, and PGPR stimulation of flavonoid production by roots [39]. The failure to observe strong effects of D. acidovorans in isolation is consistent with the latter explanation, as in this scenario the benefits of D. acidovorans for the host occur indirectly via the induced [39,41] to improve the performance of B. japonicum. A similar effect was reported in a recent study involving the application of Delftia in coinoculation with Sinorhizobium meliloti, which found that Medicago truncatula roots produced significantly higher levels of several flavone signalling molecules (which enhance rhizobial expression of nodulation genes) under co-infection relative to microbe-free or single inoculation treatments [38].…”

Section: Discussionmentioning

confidence: 99%

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Combined effects of mutualistic rhizobacteria counteract virus-induced suppression of indirect plant defences in soya bean

et al. 2019

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It is increasingly clear that microbial plant symbionts can influence interactions between their plant hosts and other organisms. However, such effects remain poorly understood, particularly under ecologically realistic conditions where plants simultaneously interact with diverse mutualists and antagonists. Here, we examine how the effects of a plant virus on indirect plant defences against its insect vector are influenced by co-occurrence of other microbial plant symbionts. Using a multi-factorial design, we manipulated colonization of soya bean using three different microbes: a pathogenic plant virus (bean pod mottle virus (BPMV)), a nodule-forming beneficial rhizobacterium ( Bradyrhizobium japonicum ) and a plant growth-promoting rhizobacterium ( Delftia acidovorans ). We then assessed recruitment of parasitoids ( Pediobious foveolatus (Eulophidae)) and parasitism rates following feeding by the BPMV vector Epilachna varivestis (Coccinellidae). BPMV infection suppressed parasitoid recruitment, prolonged parasitoid foraging time and reduced parasitism rates in semi-natural foraging assays. However, simultaneous colonization of BPMV-infected hosts by both rhizobacteria restored parasitoid recruitment and rates of parasitism to levels similar to uninfected controls. Co-colonization by the two rhizobacteria also enhanced parasitoid recruitment in the absence of BPMV infection. These results illustrate the potential of plant-associated microbes to influence indirect plant defences, with implications for disease transmission and herbivory, but also highlight the potential complexity of such interactions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Combined effects of mutualistic rhizobacteria counteract virus-induced suppression of indirect plant defences in soya bean

et al. 2019

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“…Considering these bottlenecks, in recent years, researchers have taken advantage of rhizosphere inhabitants/rhizobacteria associated with legumes to maximize their capacity/effectiveness to phytoremediate Cd-polluted soils ( Figure 1A ). In this context, PGPRs deserve special attention because of their wide variety of benefits that often enhance plant performance ( Mehboob et al, 2013 ; Figure 1 ).…”

Section: Legume–rhizobia Symbiosis Is Sensitive To CDmentioning

confidence: 99%

PGPRs and nitrogen-fixing legumes: a perfect team for efficient Cd phytoremediation?

Gómez-Sagasti¹,

Marino

2015

Front. Plant Sci.

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Cadmium (Cd) is a toxic, biologically non-essential and highly mobile metal that has become an increasingly important environmental hazard to both wildlife and humans. In contrast to conventional remediation technologies, phytoremediation based on legume–rhizobia symbiosis has emerged as an inexpensive decontamination alternative which also revitalize contaminated soils due to the role of legumes in nitrogen cycling. In recent years, there is a growing interest in understanding symbiotic legume–rhizobia relationship and its interactions with Cd. The aim of the present review is to provide a comprehensive picture of the main effects of Cd in N 2 -fixing leguminous plants and the benefits of exploiting this symbiosis together with plant growth promoting rhizobacteria to boost an efficient reclamation of Cd-contaminated soils.

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“…However, the effect of rhizobia on plant phenotypic parameters and the variability among isolated strains are rarely studied under laboratory, greenhouse or field conditions. Therefore, it is important to assess the phenotypic parameters of isolated strains, such as tolerance to pH, temperature and salinity (Marquina;González;Castro, 2011), the stimulatory effect of indole-3-acetic acid (Remans et al, 2008b), as well as nodule formation and biomass production when they are inoculated in the host plant (Wei et al, 2008;Mehboob et al, 2013). The determination of these parameters is not only necessary to elucidate the capability of isolated strains to grow under different environmental conditions but also to understand how bacterial inoculation enhances plant growth and yields.…”

Section: Introductionmentioning

confidence: 99%

Genetic and phenotypic diversity of Rhizobium isolates from Southern Ecuador

et al. 2017

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Rhizobium-legume symbioses play relevant roles in agriculture but have not been well studied in Ecuador. The aim of this study was to characterize the genetic and phenotypic diversity of Rhizobium isolates associated with Phaseolus vulgaris from southern Ecuador. Morphocultural characterization, biochemical tests and physiological analyses were conducted to authenticate and determine the diversity of bacteria Rhizobium-like isolates. The genetic diversity of the isolates was determined by molecular techniques, which consisted of bacteria DNA extraction and amplification and sequencing of the 16S rRNA gene. The nodulation parameters and nitrogen fixation for P. vulgaris under greenhouse conditions were also assessed to determine the phenotypic diversity among isolates. Furthermore, bacteria indole-acetic-acid production was evaluated by the colorimetric method. Morpho-cultural and biochemical characteristic assessments demonstrated that Rhizobium-like bacteria was associated with the P. vulgaris nodules. The diversity among the isolates, as determined by physiological analyses, revealed the potential of several isolates to grow at different pH values, salinity conditions and temperatures. Partial sequencing of the 16S rRNA gene identified the Rhizobium genus in every sampling site. From a total of 20 aligned sequences, nine species of Rhizobium were identified. Nodule formation and biomass, as well as nitrogen fixation, showed an increase in plant phenotypic parameters, which could be influenced by IAA production, especially for the strains R. mesoamericanum NAM1 and R. leguminosarum bv. viciae COL6. These results demonstrated the efficiency of native symbiotic diazotrophic strains inoculants for legume production. This work can serve as the basis for additional studies of native Rhizobium strains and to help spread the use of biofertilizers in Ecuadorian fields.Index terms: Phaseolus vulgaris; diazotrophic bacteria; 16S rRNA gene; nodulation; indole acetic acid. RESUMOA simbiose Rhizobium-leguminosa desempenha um relevante papel na agricultura, entretanto não tem recebido suficiente atenção de estudos científicos no Equador. O objetivo deste artigo foi caracterizar a diversidade genética e fenotípica de isolados de Rhizobium associados com Phaseolus vulgaris do sul do Equador. A caracterização morfo-cultural, testes bioquímicos e análises fisiológicas foram realizados para autenticar e determinar a diversidade de isolados de bactérias Rhizobium. A diversidade genética foi determinada por por técnicas moleculares consistindo na extração de DNA genômico bacteriano, amplificação e sequenciamento parcial do gene 16SrRNA; e parâmetros de nodulação e fixação de nitrogênio de P. vulgaris sobre condições de estufa foram testados para determinar a diversidade fenotípica entre os isolados. Além disso, a produção de ácido indolacético foi avaliada por um método colorimétrico. A análise fisiológica da diversidade entre os isolados revelou o potencial de crescimento de diversos isolados em diferentes níveis de pH, sa...

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Potential of Rhizosphere Bacteria for Improving Rhizobium-Legume Symbiosis

Cited by 18 publications

References 181 publications

Combined effects of mutualistic rhizobacteria counteract virus-induced suppression of indirect plant defences in soya bean

Combined effects of mutualistic rhizobacteria counteract virus-induced suppression of indirect plant defences in soya bean

PGPRs and nitrogen-fixing legumes: a perfect team for efficient Cd phytoremediation?

Genetic and phenotypic diversity of Rhizobium isolates from Southern Ecuador

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