Interactions Between Legumes and Rhizobia Under Stress Conditions

Andrés, Javier; Rovera, Marisa; Guiñazú, Lorena B.; Pastor, Nicolás; Rosas, Susana B.

doi:10.1007/978-3-642-23465-1_5

Cited by 10 publications

(7 citation statements)

References 87 publications

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“…Such variability in symbiotic system which has the ability of collections of rhizobia, is a result of high biodiversity of these microorganisms, associated with biotic and abiotic factors. Studies have shown that the symbiotic association is affected by several factors such as soil acidity, aluminum toxicity (Campanharo et al, 2010), salinity (Medeiros et al, 2008), low soil fertility (Sulieman and Tran, 2015), phosphorus and molybdenum deficiency (Matoso and Kusdra, 2014), high soil temperatures (Ferrari et al, 1967) and low water availability in the soil (Andres et al, 2012). The use of microsymbionts adapted to different environmental conditions, combined with the correction of factors related to soil fertility, which may potentiate the effects of inoculation with diazotrophic bacteria.…”

Section: Resultsmentioning

confidence: 99%

Prospecting of efficient rhizobia for peanut inoculation in a Planosol under different vegetation covers

Santos¹,

Silva²,

Freitas³

et al. 2017

Afr. J. Microbiol. Res.

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Peanut (Arachis hypogaea L.) is capable of establishing an efficient symbiosis with a wide range of rhizobia, nevertheless, the inoculation of this legume is under used due to lack of information on the bacteria naturally established in soils and the agronomic and economic viabil ity of the practice. The aim of this study was to evaluate the diversity and the symbiotic efficiency of peanut rhizobia from a Planosol under different vegetation covers (native vegetation, sugarcane cultivation and fallow after sugarcane cultivation), located in Zona da Mata, Northeast of Brazil. A total of 177 isolates were obtained from peanut nodules, most of them having the characteristic of rapid growth and acidification of the Yeast Mannitol Agar (YMA) medium. The isolates obtained from soil sample s with native vegetation cover showed higher relative abundance, higher species richness and greater uniformity of morphological groups of rhizobia. Eighteen isolates were evaluated for their ability to nodulate peanuts, of which 13 have been authenticated and submitted to evaluation of symbiotic efficiency in pots with soil. The isolate 23M showed the best symbiotic performance in pots with soil. In the field, plants inoculated with the isolate 23M showed better performance than non-inoculated plants, in addition to a grain yield (kg ha -1 ) similar to that of plants inoculated with recommended bacteria or receiving 200 kg ha -1 N.

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Section: Resultsmentioning

confidence: 99%

Prospecting of efficient rhizobia for peanut inoculation in a Planosol under different vegetation covers

Santos¹,

Silva²,

Freitas³

et al. 2017

Afr. J. Microbiol. Res.

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“…For example, local increases in soil salinity can inhibit rhizobial nitrogen fixation (Andrés et al . ) and fire can reduce both mycorrhizal and rhizobial colonisation of host plants, in some cases favouring exotic weeds over native species (Carvalho et al . ).…”

Section: Plant–symbiont Interactionsmentioning

confidence: 99%

Microbial community responses to anthropogenically induced environmental change: towards a systems approach

Brown²,

et al. 2013

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The soil environment is essential to many ecosystem services which are primarily mediated by microbial communities. Soil physical and chemical conditions are altered on local and global scales by anthropogenic activity and which threatens the provision of many soil services. Despite the importance of soil biota for ecosystem function, we have limited ability to predict and manage soil microbial community responses to change. To better understand causal relationships between microbial community structure and ecological function, we argue for a systems approach to prediction and management of microbial response to environmental change. This necessitates moving beyond concepts of resilience, resistance and redundancy that assume single optimum stable states, to ones that better reflect the dynamic and interactive nature of microbial systems. We consider the response of three soil groups (ammonia oxidisers, denitrifiers, symbionts) to anthropogenic perturbation to motivate our discussion. We also present a network re-analysis of a saltmarsh microbial community which illustrates how such approaches can reveal ecologically important connections between functional groups. More generally, we suggest the need for integrative studies which consider how environmental variables moderate interactions between functional groups, how this moderation affects biogeochemical processes and how these feedbacks ultimately drive ecosystem services provided by soil biota.

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“…Some of these effects, including nitrogenase activity, may be even stronger than observed for drought conditions. This phenomenon appears to be mostly linked to reduced O 2 availability ( Andres et al, 2012 ).…”

Section: Environmental Effects On Signal Exchangementioning

confidence: 99%

Legume-rhizobia signal exchange: promiscuity and environmental effects

2015

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Although signal exchange between legumes and their rhizobia is among the best-known examples of this biological process, most of the more characterized data comes from just a few legume species and environmental stresses. Although a relative wealth of information is available for some model legumes and some of the major pulses such as soybean, little is known about tropical legumes. This relative disparity in current knowledge is also apparent in the research on the effects of environmental stress on signal exchange; cool-climate stresses, such as low-soil temperature, comprise a relatively large body of research, whereas high-temperature stresses and drought are not nearly as well understood. Both tropical legumes and their environmental stress-induced effects are increasingly important due to global population growth (the demand for protein), climate change (increasing temperatures and more extreme climate behavior), and urbanization (and thus heavy metals). This knowledge gap for both legumes and their environmental stresses is compounded because whereas most temperate legume-rhizobia symbioses are relatively specific and cultivated under relatively stable environments, the converse is true for tropical legumes, which tend to be promiscuous, and grow in highly variable conditions. This review will clarify some of this missing information and highlight fields in which further research would benefit our current knowledge.

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Interactions Between Legumes and Rhizobia Under Stress Conditions

Cited by 10 publications

References 87 publications

Prospecting of efficient rhizobia for peanut inoculation in a Planosol under different vegetation covers

Prospecting of efficient rhizobia for peanut inoculation in a Planosol under different vegetation covers

Microbial community responses to anthropogenically induced environmental change: towards a systems approach

Legume-rhizobia signal exchange: promiscuity and environmental effects

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