Effect of the flavonoid quercetin on culture and isolation ofFrankia fromCasuarina root nodules

Sayed, W. F.; Wheeler, C. T.

doi:10.1007/bf02816223

Cited by 13 publications

(9 citation statements)

References 21 publications

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“…Phenolic compounds may also limit Frankia colonization compartments inside the host nodule tissues (Laplaze et al 2000). The added quercetin increased the isolated Frankia colonies, while fungal contaminants were reduced, in the isolation medium (Sayed and Wheeler 1999). Under field conditions, the ratio of litterfall decomposition is suggested to be directly related to the plant defensive action due to the amount of released flavonoids in the surrounding soil (Siqueira et al 1991;Waid 1997).…”

Section: Age Of Plant and Direct Interaction With Littermentioning

confidence: 98%

“…Flavonoids in casuarinas, such as quercetin and kampferol, have an antimicrobial effect especially against fungi (Siqueira et al 1991;Sayed and Wheeler 1999). Kaempferol and quercetin, along with other phenolic compounds, were the dominant flavonoids in the tested Casuarina species in Egypt (Saleh and El-Lakany 1979).…”

Section: Age Of Plant and Direct Interaction With Littermentioning

confidence: 99%

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Improving Casuarina growth and symbiosis with Frankia under different soil and environmental conditions—review

Sayed

2011

Folia Microbiol

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Casuarinas are very important plants for their various uses and survival in adverse sites or harsh environments. As nitrogen fixation, in symbiosis with Frankia, is an important factor for the survival of these plants under various conditions, the basis for selecting both effective and tolerant Frankia strains and Casuarina spp., are provided. Enhancement of the symbiotic relationship between Frankia and Casuarina, by mycorrhizal infection and other biofertilizing microorganisms such as Bacillus and Azospirillum, is reflected by superior plant growth. Casuarina leaf litter is also a great source for both inorganic and organic nutrients. Therefore, careful management of the top soil layer under Casuarina trees is very important. Litter decomposition ratio is affected by many physical chemical and biological factors including temperature, moisture conditions, lignin, and C-to-N and N-to-P ratios in addition to soil biota. In general, here the above relations are discussed and an alleviation model is presented for important disturbances of natural and human origin made in soil and environment, especially in the dry regions. In conclusion, we suggest how to optimize the nitrogen fixation and plant growth under the prevalent conditions.

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Section: Age Of Plant and Direct Interaction With Littermentioning

confidence: 98%

Section: Age Of Plant and Direct Interaction With Littermentioning

confidence: 99%

Improving Casuarina growth and symbiosis with Frankia under different soil and environmental conditions—review

Sayed

2011

Folia Microbiol

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“…In laboratory, Frankia growth is a time consuming operation and need special procedures (Baker 1988). Frequently, long periods (10 to 20 days) are required for their cultivation but reduce the period by supplementing with flavonoid quercetin (Sayed and Wheeler 1999). This period was reduced to three days by using gellan gum as a gelling agent and peptones .…”

Section: Symbiotic Actinobacteria: Genus Frankiamentioning

confidence: 98%

“…They are isolated either from soil samples (Maunuksela et al 1999) or from crushed roots after surface sterilization (Baker and O'Keefe 1984;Rosbrook et al 1989;Baker 1990;Lechevalier and Lechevalier 1990). Their growth needs special procedures (Baker and O'Keefe 1984;Sayed and Wheeler 1999;Bassi and Benson 2007). Most abundant Actinobacteria in soils are Streptomyces and Nocardia.…”

Section: Plate Count and Morphological Approachesmentioning

confidence: 99%

Diversity of Plant Associated Actinobacteria

Bouizgarne

Aouamar

2014

Sustainable Development and Biodiversity

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The phylum Actinobacteria encompasses Gram-positive bacteria with a high DNA G+C. In soils, they present multiple lifestyles: rhizosphere saprophytes, endophytes, facultative symbionts and obligate phytopathogens. They play either beneficial or adverse effects towards plants. Numerous studies focused on their taxonomy and preservation. Also, adequate strategies were developed to enable their isolation. Phenotypically, the Actinobacteria is one of the most diverse phyla within bacteria. Their presence was once monitored by classical culture dependent techniques and phenetic characterization. Development of culture independent methods including chemotaxonomic and genomic approaches such as 16S rRNA gene analysis allowed to detect the so called unculturable bacteria. Major works on their diversity combine culture dependant and independant techniques. This chapter focuses on the phenetic and genetic diversity of Actinobacteria in plant-soil systems. It begins with some knowledge of their biology and their taxonomy, followed by a brief overview of the methods that have facilitated advances in the understanding of their diversity. It also discusses diversity of ecologically important plant associated Actinobacteria (rhizosphere and phyllosphere colonizers, endophytes, symbionts and phytopathogens).

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“…Crucial steps for isolation of the endophyte from nodules are the surface sterilization of root nodules and the isolation and growth media to be used. Strain isolation and growth may be favoured by adding special factors to the culture media, like the triterpene dipterocarpol purified from root lipid extracts of Alnus glutinosa (Quispel et al 1983(Quispel et al , 1989, or the flavonoid quercetin (Sayed and Wheeler 1999). Due to the slow growth rate of Frankia, contaminants are the major difficulty that arises during isolation trials.…”

Section: Isolation From Nodulesmentioning

confidence: 99%

Life in soil by the actinorhizal root nodule endophyte Frankia. A review

2010

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Frankia is a genus of soil actinomycetes famous for its ability to form N 2 -fixing root nodule symbioses with actinorhizal plants. Although Frankia strains display a high diversity in terms of ecological niches in soil, current knowledge about Frankia is dominated by its life as an endophyte in root nodules. Increased use of molecular methods has refined and expanded insights into endophytehost specificities and Frankia phylogeny. This review has focus on Frankia as a soil organism, including its part of microbial consortia, and how to study Frankia in soil. We highlight the use of nodulation tests and molecular methods to reveal population size and genetic diversity of Frankia in soil and discuss how autoregulation of nodulation and interactions with other soil microorganisms may influence the results. A comprehensive record of published interactions between Frankia and other soil microbes is summarized. Life in soil by the actinorhizal root nodule endophyte Frankia 203 204 E.E. Chaia et al. E.E. Chaia et al.

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Effect of the flavonoid quercetin on culture and isolation ofFrankia fromCasuarina root nodules

Cited by 13 publications

References 21 publications

Improving Casuarina growth and symbiosis with Frankia under different soil and environmental conditions—review

Improving Casuarina growth and symbiosis with Frankia under different soil and environmental conditions—review

Diversity of Plant Associated Actinobacteria

Life in soil by the actinorhizal root nodule endophyte Frankia. A review

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