Flavonoid‐like compounds from seeds of red alder (<i>Alnus rubra</i>) influence host nodulation by <i>Frankia</i> (Actinomycetales)

Benoit, Larry F.; Berry, Alison M.

doi:10.1111/j.1399-3054.1997.tb05361.x

Cited by 66 publications

(22 citation statements)

References 24 publications

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“…Flavonoids were shown to accumulate in actinorhizal nodules (Laplaze et al 1999). Among the flavonoid-like compounds extracted from red alder (Alnus rubra), one possible flavanone enhanced nodulation, whereas two other compounds were shown to act as inhibitors (Benoit and Berry 1997). To assess the roles of flavonoids in Frankia-actinorhizal symbiosis, eight flavonoid compounds were extracted from the fruits of Myrica gale, with two dihydrochacone compounds found to enhance the growth and nitrogen fixation of compatible, but not incompatible, Frankia strains (Popovici et al 2010).…”

Section: Interaction With Rhizobiamentioning

confidence: 99%

Flavonoids in plant rhizospheres: secretion, fate and their effects on biological communication

Sugiyama

Yazaki

2014

Plant Biotechnology

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Flavonoids, one of the most-described group of plant "specialized metabolites", consist of more than 10,000 structurally diverse compounds. Most flavonoids accumulate in plant vacuoles as glycosides, with some released by the roots into rhizospheres. These flavonoids are involved in biological communications with rhizobia, arbuscular mycorrhizal fungi, plant growth promoting rhizobacteria, pathogens, nematodes, and other plant species. Both aglycones and glycosides of flavonoids are found in root exudates and in soils. This review describes researches on the mechanisms of flavonoid secretion and the fate of flavonoids released into rhizospheres. This review also discusses the direction of future research that may elucidate the specific roles of flavonoids in biological communications in rhizospheres, enabling the utilization of flavonoid activities and functions in agricultural practice.

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Section: Interaction With Rhizobiamentioning

confidence: 99%

Flavonoids in plant rhizospheres: secretion, fate and their effects on biological communication

Sugiyama

Yazaki

2014

Plant Biotechnology

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“…Although previous studies on root exudates have used solventextracted samples, aqueous root exudates were chosen for use in this study (1,13,29). Root exudates from plants grown under nitrogen-deficient and nitrogen-sufficient conditions were collected from both 2-month-old soil-grown plants and 3 week-, 1 month-, and 2-month-old axenically grown plants.…”

Section: Production Of Aqueous Root Exudates and General Propertiesmentioning

confidence: 99%

“…The soil-and axenically grown C. cunninghamiana root exudates contained similar levels of phenolic (2.0 to 4.9 g/ml) and flavonoid (9.9 to 18.6 g/ml) compounds (data not shown). Flavonoid compounds have been identified from extracts of Alnus glutinosa, Myrica gale, and Casuarina glauca (1,29). Although flavonoid compounds were detected in the C. cunninghamiana root exudates, we did not want to exclude other possible plant-signaling molecules and used aqueous extracts throughout this study.…”

Section: Production Of Aqueous Root Exudates and General Propertiesmentioning

confidence: 99%

Casuarina Root Exudates Alter the Physiology, Surface Properties, and Plant Infectivity of Frankia sp. Strain CcI3

Beauchemin

Furnholm

Lavenus

et al. 2012

Appl Environ Microbiol

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The actinomycete genus Frankia forms nitrogen-fixing symbioses with 8 different families of actinorhizal plants, representing more than 200 different species. Very little is known about the initial molecular interactions between Frankia and host plants in the rhizosphere. Root exudates are important in Rhizobium-legume symbiosis, especially for initiating Nod factor synthesis. We measured differences in Frankia physiology after exposure to host aqueous root exudates to assess their effects on actinorhizal symbioses. Casuarina cunninghamiana root exudates were collected from plants under nitrogen-sufficient and -deficient conditions and tested on Frankia sp. strain CcI3. Root exudates increased the growth yield of Frankia in the presence of a carbon source, but Frankia was unable to use the root exudates as a sole carbon or energy source. Exposure to root exudates caused hyphal "curling" in Frankia cells, suggesting a chemotrophic response or surface property change. Exposure to root exudates altered Congo red dye binding, which indicated changes in the bacterial surface properties at the fatty acid level. Fourier transform infrared spectroscopy (FTIR) confirmed fatty acid changes and revealed further carbohydrate changes. Frankia cells preexposed to C. cunninghamiana root exudates for 6 days formed nodules on the host plant significantly earlier than control cells. These data support the hypothesis of early chemical signaling between actinorhizal host plants and Frankia in the rhizosphere.A ctinorhizal symbioses are mutualistic interactions that occur between actinorhizal plants and the actinomycete genus Frankia (27,38). Frankia exists either in a free-living state in the soil or in symbiosis with actinorhizal plants (2, 4, 31). Actinorhizal plants consist of 8 different plant families, including over 200 different species of woody dicotyledonous trees and shrubs (31,38,42). The globally distributed actinorhizal plants are found on every continent except Antarctica and are able to grow in a diverse set of natural habitats, including arid lands, plains, tundra, and temperate forests. Actinorhizal plants are pioneer plant species that are able to grow in extremely nutrient-poor soil conditions and, with the aid of Frankia, are able to reclaim surrounding soil in disrupted environments. Actinorhizal plants are important in agroforestry, in soil reclamation, and as a fuel source.While actinorhizal symbiosis has been well studied at a morphological level since the 1970s, very little is known about the molecular interactions that occur between the plant hosts and Frankia during the establishment of the association. The establishment of the symbiosis encompasses the infection and nodulation processes (23,27,38). In general, the bacterium needs to recognize a host plant and the host needs to identify the bacterium as a friend, not a foe. The bacteria enter the plant and establish the association after several steps. The infection ultimately leads to the formation of the mature nodule.There is a paucity of information o...

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“…Leaves of Casuarina, for example, have been found to contain compounds that promote growth of Casuarina-infective Frankia strains (54). In addition, compounds detected in seeds of A. rubra are found to enhance nodulation by frankiae (4).…”

mentioning

confidence: 99%

“…Frankia strains were grown for 4 weeks in PϩN medium (33) containing propionate and NH 4 Cl as carbon and nitrogen sources, respectively. Cultures were harvested by centrifugation, washed twice in phosphate-buffered saline (PBS; composed of 0.13 M NaCl, 7 mM Na 2 HPO 4 , and 3 mM NaH 2 PO 4 , pH 7.2, in water) (16) and homogenized in PBS by repeated passages through a needle (0.6 mm in diameter) with a sterile syringe (17).…”

mentioning

confidence: 99%

Effect of Inoculation and Leaf Litter Amendment on Establishment of Nodule-Forming Frankia Populations in Soil

Nickel

Pelz

Hahn

et al. 2001

Appl Environ Microbiol

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High-N 2 -fixing activities of Frankia populations in root nodules on Alnus glutinosa improve growth performance of the host plant. Therefore, the establishment of active, nodule-forming populations of Frankia in soil is desirable. In this study, we inoculated Frankia strains of Alnus host infection groups I, IIIa, and IV into soil already harboring indigenous populations of infection groups (IIIa, IIIb, and IV). Then we amended parts of the inoculated soil with leaf litter of A. glutinosa and kept these parts of soil without host plants for several weeks until they were spiked with

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Flavonoid‐like compounds from seeds of red alder (Alnus rubra) influence host nodulation by Frankia (Actinomycetales)

Cited by 66 publications

References 24 publications

Flavonoids in plant rhizospheres: secretion, fate and their effects on biological communication

Flavonoids in plant rhizospheres: secretion, fate and their effects on biological communication

Casuarina Root Exudates Alter the Physiology, Surface Properties, and Plant Infectivity of Frankia sp. Strain CcI3

Effect of Inoculation and Leaf Litter Amendment on Establishment of Nodule-Forming Frankia Populations in Soil

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