Rhizobial diversity and function in rooibos (Aspalathus linearis) and honeybush (Cyclopia spp.) plants: A review

Brink, Casparus Johannes; Postma, Anneke; Jacobs, Karin

doi:10.1016/j.sajb.2016.10.025

Cited by 15 publications

(10 citation statements)

References 74 publications

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“…Thus, N 2 -fixing rhizobia native to the sandy nutrient-poor soils of the Cape fynbos would have IAA production as an adaptation to supporting root growth of their homologous host legumes. This argument is re-enforced by the fact that the biosynthesis of IAA has been reported in species of Burkholderia , Rhizobium , Mesorhizobium and Bradyrhizobium in the Cape fynbos 16 , 51 .…”

Section: Discussionmentioning

confidence: 99%

Ecological adaptation and phylogenetic analysis of microsymbionts nodulating Polhillia, Wiborgia and Wiborgiella species in the Cape fynbos, South Africa

Mpai

Jaiswal

Cupido

et al. 2021

Sci Rep

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Polhillia, Wiborgia and Wiborgiella species are shrub legumes endemic to the Cape fynbos of South Africa. They have the ability to fix atmospheric N2 when in symbiosis with soil bacteria called ‘rhizobia’. The aim of this study was to assess the morpho-physiological and phylogenetic characteristics of rhizobia associated with the nodulation of Polhillia, Wiborgia and Wiborgiella species growing in the Cape fynbos. The bacterial isolates from root nodules consisted of a mixture of fast and intermediate growers that differed in colony shape and size. The isolates exhibited tolerance to salinity (0.5–3% NaCl) and pH (pH 5–10) and different antibiotic concentrations, and could produce 0.51 to 51.23 µg mL−1 of indole-3-acetic acid (IAA), as well as solubilize tri-calcium phosphate. The ERIC-PCR results showed high genomic diversity in the rhizobial population and grouped them into two major clusters. Phylogenetic analysis based on 16S rRNA, atpD, glnII, gyrB, nifH and nodC gene sequences revealed distinct and novel evolutionary lineages related to the genus Rhizobium and Mesorhizobium, with some of them being very close to Mesorhizobium australicum. However, the phylogenetic analysis of glnII and nifH genes of some isolates showed incongruency.

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Section: Discussionmentioning

confidence: 99%

Ecological adaptation and phylogenetic analysis of microsymbionts nodulating Polhillia, Wiborgia and Wiborgiella species in the Cape fynbos, South Africa

Mpai

Jaiswal

Cupido

et al. 2021

Sci Rep

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“…La formación del nódulo en la raíz depende de un proceso de desarrollo del nódulo y sus tejidos, y el proceso de infección de la raíz (Desbrosses y Stougaard, 2011). El proceso de infección está dado por la interacción de Rhizobium y factores de nodulación o factores Nod (Brink et al, 2017). Los factores Nod son moléculas de señalización simbiótica que le otorgan especificidad al huésped para la infección (Gough, 2003); inician la división celular en la raíz hasta que se forma el nódulo y actúan en la fijación del nitrógeno (Brink et al, 2017).…”

Section: Rhizoscyphus Ericae Y Phialocephala Fortinii Vaccinium Membrunclassified

“…El proceso de infección está dado por la interacción de Rhizobium y factores de nodulación o factores Nod (Brink et al, 2017). Los factores Nod son moléculas de señalización simbiótica que le otorgan especificidad al huésped para la infección (Gough, 2003); inician la división celular en la raíz hasta que se forma el nódulo y actúan en la fijación del nitrógeno (Brink et al, 2017). El proceso de formación inicia con la adhesión de Rhizobium en los pelos radicales de la planta y luego se excretan los factores Nod, que desencadenan a la formación de un nódulo primordio (Limpens & Bisseling, 2014).…”

Section: Rhizoscyphus Ericae Y Phialocephala Fortinii Vaccinium Membrunclassified

Vacciniumspp.: Karyotypic and phylogenetic characteristics, nutritional composition, edaphoclimatic conditions, biotic factors and beneficial microorganisms in the rhizosphere

et al. 2021

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“…In order to make nutrients such as nitrogen and phosphorus, available to plants, both plants and microorganisms excrete enzymes to cleave nitrogen and phosphorus from organic forms [28,29]. Nitrogen limitations of soils are also overcome by the fixing of atmospheric nitrogen by various bacterial taxa associated with leguminous plants, as well as a number of free-living bacteria [30]. The interaction between plant roots, soil and microorganisms is most intense in the rhizosphere and plant exudates play a significant role in structuring the microbial communities [31].…”

Section: Plant-soil-microbial Interactionsmentioning

confidence: 99%

Microbial Communities in the Fynbos Region of South Africa: What Happens during Woody Alien Plant Invasions

2020

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The Cape Floristic Region (CFR) is globally known for its plant biodiversity, and its flora is commonly referred to as fynbos. At the same time, this area is under severe pressure from urbanization, agricultural expansion and the threat of invasive alien plants. Acacia, Eucalyptus and Pinus are the common invasive alien plants found across the biome and considerable time, effort and resources are put into the removal of invasive alien plants and the rehabilitation of native vegetation. Several studies have shown that invasion not only affects the composition of plant species, but also has a profound effect on the soil chemistry and microbial populations. Over the last few years, a number of studies have shown that the microbial populations of the CFR are unique to the area, and harbour many endemic species. The extent of the role they play in the invasion process is, however, still unclear. This review aims to provide an insight into the current knowledge on the different microbial populations from this system, and speculate what their role might be during invasion. More importantly, it places a spotlight on the lack of information about this process.

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Rhizobial diversity and function in rooibos (Aspalathus linearis) and honeybush (Cyclopia spp.) plants: A review

Cited by 15 publications

References 74 publications

Ecological adaptation and phylogenetic analysis of microsymbionts nodulating Polhillia, Wiborgia and Wiborgiella species in the Cape fynbos, South Africa

Ecological adaptation and phylogenetic analysis of microsymbionts nodulating Polhillia, Wiborgia and Wiborgiella species in the Cape fynbos, South Africa

Vacciniumspp.: Karyotypic and phylogenetic characteristics, nutritional composition, edaphoclimatic conditions, biotic factors and beneficial microorganisms in the rhizosphere

Microbial Communities in the Fynbos Region of South Africa: What Happens during Woody Alien Plant Invasions

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